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NU Class 7 Test practice questions

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Question 1Unconfirmed - official content outline not supplied for this exam

For a Class 7 package, what does the transport index (TI) represent?

  1. The one-metre dose rate in mSv/h multiplied by 100. Correct answer.
  2. The total activity of the radionuclides inside the package, expressed in becquerels.
  3. The mass of the package multiplied by its surface dose rate.
  4. The removable surface contamination on the package, expressed in Bq/cm².

Explanation

The transport index is a dimensionless number used for transport controls such as accumulation and separation. For a package or overpack it is based on the maximum radiation level at one metre from the external surface, expressed in mSv/h and multiplied by 100. It is not a measure of activity, mass, or removable contamination.

Question 2Unconfirmed - official content outline not supplied for this exam

A Class 7 package has a maximum surface dose rate of 0.3 mSv/h and a transport index of 0.8. Which label category does it require?

  1. FISSILE
  2. I-WHITE
  3. II-YELLOW Correct answer.
  4. III-YELLOW

Explanation

Category II-YELLOW applies when the surface dose rate is above 0.005 mSv/h but not more than 0.5 mSv/h, and the TI is above 0 but not more than 1. The stated values fall inside both bands, while I-WHITE requires a TI of zero and a much lower surface dose rate. III-YELLOW is reserved for higher TI or surface dose rate values.

Question 3Unconfirmed - official content outline not supplied for this exam

In Class 7 transport, what does “exclusive use” mean?

  1. The consignment is transported directly without intermediate storage.
  2. One consignor has sole use of a conveyance, with controlled loading and unloading. Correct answer.
  3. The package is exempt from labeling because only one package is shipped.
  4. The package is carried on a vehicle that contains only Class 7 material.

Explanation

Exclusive use is an arrangement in which one consignor has sole use of a conveyance or container and controls loading and unloading. It is not a label category and does not by itself exempt a package from radiation protection requirements. The term concerns control of the conveyance, not the route or the number of packages.

Question 4Unconfirmed - official content outline not supplied for this exam

What is the main purpose of the criticality safety index (CSI) for a package containing fissile material?

  1. To record the total gamma dose rate at the package surface.
  2. To show the package’s external contamination level.
  3. To cap accumulated fissile packages and prevent criticality. Correct answer.
  4. To identify the chemical form of the fissile material.

Explanation

The CSI is a number assigned to packages, overpacks, or containers holding fissile material so that accumulated values can be controlled against limits. This accumulation control helps prevent a criticality accident during transport and storage in transit. CSI is separate from the transport index, which addresses external radiation dose rate.

Question 5Unconfirmed - official content outline not supplied for this exam

A Type B package used for Class 7 material is designed to do which of the following?

  1. Withstand severe accident conditions and retain contents. Correct answer.
  2. Be used only for exempt concentrations and low-activity samples.
  3. Provide shielding only during routine handling, not during accidents.
  4. Be opened routinely for inspection without radiation controls.

Explanation

Type B packages must be able to withstand specified severe accident conditions and still retain their radioactive contents and provide adequate shielding. Type A packages are intended to withstand routine transport conditions, not the more severe accident test sequence. The higher performance standard is the defining feature of Type B packaging.

Question 6Unconfirmed - official content outline not supplied for this exam

Special form radioactive material is best described as which of the following?

  1. Material with a specific activity below the LSA threshold.
  2. Material that can be dispersed easily as a powder in air.
  3. Any radioactive liquid that has been solidified in a binder.
  4. A sealed capsule or indissoluble solid that passes specified tests. Correct answer.

Explanation

Special form radioactive material is either an indissoluble solid or a sealed capsule containing radioactive material, and it must meet specified tests demonstrating low dispersibility. The special form designation affects packaging and activity limits because the material is less likely to disperse if released. It is not defined by being a solidified liquid or by low specific activity.

Question 7Unconfirmed - official content outline not supplied for this exam

A consignment has two Class 7 packages in the same conveyance, each with a transport index of 0.4. How should the total transport index be treated?

  1. It is 1.6 because each package is counted twice for shielding.
  2. It remains 0.4 because TI is not additive.
  3. It is 0.8 but only controls the package surface dose rate.
  4. It is 0.8 and controls accumulation and separation on the conveyance. Correct answer.

Explanation

Transport index values for packages carried in the same conveyance or overpack are summed to give the total TI. The total is used for accumulation and separation controls, not for recalculating each package’s surface dose rate. Here the sum of 0.4 and 0.4 is 0.8.

Question 8Unconfirmed - official content outline not supplied for this exam

Why are removable surface contamination limits important for Class 7 packages?

  1. They determine whether the material is special form.
  2. They replace the need for radiation labels.
  3. They limit transferable contamination that could expose people and equipment. Correct answer.
  4. They set the package’s transport index.

Explanation

Removable contamination can be transferred from package surfaces to workers, equipment, and conveyances, creating exposure and spread of radioactive material. Limits are expressed in activity per unit area and are checked by survey methods. They do not replace dose-rate controls, labels, or transport index requirements.

Question 9Unconfirmed - official content outline not supplied for this exam

During unloading, a worker finds a Class 7 package labeled II-YELLOW with a torn outer layer and loose material. What is the safest immediate action?

  1. Stop handling, isolate the area, and notify radiation safety or emergency response. Correct answer.
  2. Reseal the package with tape and finish unloading before reporting.
  3. Wash the loose material into the drainage system to prevent spread.
  4. Open the package fully to identify the radionuclide before calling anyone.

Explanation

A damaged Class 7 package may have lost shielding or containment, so the immediate priority is to stop handling, isolate the area, and keep people away while notifying the radiation safety or emergency response chain. Unnecessary handling or opening can increase exposure and spread contamination. Cleanup and identification should be done by trained responders using appropriate controls.

Question 10Unconfirmed - official content outline not supplied for this exam

A conveyance carries three fissile packages with CSI values 2, 3, and 5. The applicable CSI limit for the conveyance is 50. What is the accumulated CSI and the correct conclusion?

  1. 10, so it exceeds the limit and must not be carried.
  2. 5, so it is within the limit.
  3. 50, so it is exactly at the limit.
  4. 10, so it is within the limit. Correct answer.

Explanation

Criticality safety index values are added to give the accumulated CSI for the conveyance or overpack. The sum here is 2 + 3 + 5 = 10, which is below the stated limit of 50. The consignment therefore remains within the accumulation limit, assuming no other packages or overpacks add to the total.

Question 11Unconfirmed - official content outline not supplied for this exam

On a Class 7 label, what does the trefoil symbol primarily indicate?

  1. That the package must be kept upright during handling
  2. That the contents present an ionizing radiation hazard Correct answer.
  3. That the package contains a flammable gas under pressure
  4. That the contents are corrosive and require segregation

Explanation

The trefoil is the internationally recognized symbol for ionizing radiation. It appears on Class 7 labels to warn that the package contains radioactive material and that radiation protection measures apply.

Question 12Unconfirmed - official content outline not supplied for this exam

A Class 7 package is marked “UN 2912.” What does this marking identify?

  1. The specific radioactive material by its UN number Correct answer.
  2. The emergency response telephone number for the consignment
  3. The maximum transport index permitted for the package
  4. The competent authority certificate number for the package design

Explanation

In Class 7 marking, the UN number identifies the specific radioactive material or article in the package. UN 2912 corresponds to a low specific activity material entry, but the general rule is that the UN number links the package to the dangerous goods list.

Question 13Unconfirmed - official content outline not supplied for this exam

In Class 7 transport terminology, what does “SCO” mean?

  1. Surface Contaminated Object Correct answer.
  2. Special cargo overlay
  3. Sealed container overflow
  4. Shipment clearance order

Explanation

SCO stands for Surface Contaminated Object, a Class 7 category for solid objects that are contaminated on their surfaces. SCO is distinct from LSA material, which is radioactive material with low specific activity.

Question 14Unconfirmed - official content outline not supplied for this exam

When Class 7 packages are placed inside an overpack, which requirement applies to the overpack’s markings and labels?

  1. The overpack must display the labels and markings of the packages inside unless those marks remain visible Correct answer.
  2. The overpack replaces all package labels and needs only a generic Class 7 placard
  3. The overpack must be marked only with the total transport index of the contents
  4. The overpack must be left unmarked to avoid conflicting information

Explanation

An overpack must reproduce the required labels and markings of the packages it contains, unless those labels and markings are visible through the overpack. This preserves hazard communication and ensures handlers see the correct Class 7 information.

Question 15Unconfirmed - official content outline not supplied for this exam

A Type A package is intended for which type of Class 7 content?

  1. Spent nuclear fuel that generates significant decay heat
  2. Only material approved as special form by the competent authority
  3. Any activity of fissile material, provided the package is sealed
  4. Radioactive material in amounts not exceeding the applicable A1 or A2 limits Correct answer.

Explanation

Type A packages are designed for limited quantities of radioactive material, specifically activities not exceeding the A1 or A2 limits. Larger activities generally require a Type B package, which must withstand more severe accident conditions.

Question 16Unconfirmed - official content outline not supplied for this exam

Which item must appear on the transport document for a consignment of Class 7 material?

  1. The manufacturer’s warranty for the packaging
  2. The dose rate measured inside the package
  3. The transport index, where applicable, and the UN number Correct answer.
  4. The names of all persons who handled the package

Explanation

The Class 7 transport document must include key shipment data such as the UN number, proper shipping name, class, and where applicable the transport index and criticality safety index. This information lets carriers apply the correct segregation, marking, and dose-rate controls.

Question 17Unconfirmed - official content outline not supplied for this exam

For a road vehicle carrying Class 7 packages under non-exclusive use, what is the maximum permissible dose rate at any point on the external surface of the vehicle?

  1. 0.1 mSv/h
  2. 10 mSv/h
  3. 0.5 mSv/h
  4. 2 mSv/h Correct answer.

Explanation

Under the international Class 7 transport rules, a vehicle in non-exclusive use must not exceed 2 mSv/h at any point on its external surface. The dose rate at 2 m from the vehicle surface must also not exceed 0.1 mSv/h.

Question 18Unconfirmed - official content outline not supplied for this exam

What is the general maximum removable surface contamination limit for beta/gamma-emitting radionuclides on the external surface of a Class 7 package?

  1. 40 Bq/cm²
  2. 400 Bq/cm²
  3. 0.4 Bq/cm²
  4. 4 Bq/cm² Correct answer.

Explanation

The non-fixed contamination limit for beta/gamma emitters and low-toxicity alpha emitters is 4 Bq/cm² on package surfaces. For other alpha-emitting radionuclides the limit is ten times lower, at 0.4 Bq/cm².

Question 19Unconfirmed - official content outline not supplied for this exam

Which statement correctly distinguishes Type B(U) from Type B(M) packages?

  1. Type B(U) packages have no activity limit, while Type B(M) packages are limited to A2 values
  2. Type B(M) packages are approved only for domestic transport, while Type B(U) packages are approved only for export
  3. Type B(U) packages may be used only for fissile material, while Type B(M) packages may not
  4. Type B(U) packages require unilateral competent authority approval, while Type B(M) packages require multilateral approval Correct answer.

Explanation

The designation U means unilateral approval by the competent authority of the country of origin, while M means multilateral approval by all countries involved in the shipment. Type B(M) packages are often used when operational controls or additional approvals are needed.

Question 20Unconfirmed - official content outline not supplied for this exam

For a fissile package, how is the criticality safety index normally determined?

  1. It is the measured neutron dose rate at 1 m from the package surface
  2. It is 50 divided by the maximum number of such packages that remain subcritical, rounded up Correct answer.
  3. It is the total mass of fissile material in grams divided by 50
  4. It is the package’s transport index multiplied by its surface dose rate

Explanation

The CSI is calculated as 50 divided by N, where N is the maximum number of packages that a criticality safety analysis shows would remain subcritical in an array. The result is rounded up to the next whole number and is used to control package accumulation.

Question 21Unconfirmed - official content outline not supplied for this exam

Which of the following consignments is classified as LSA-I in Class 7 transport?

  1. Plutonium oxide powder recovered during reprocessing
  2. Uranium ore in its natural, unprocessed state Correct answer.
  3. Activated steel components removed from a reactor core
  4. Irradiated fuel elements discharged from a research reactor

Explanation

LSA-I covers ores containing naturally occurring radionuclides and unirradiated natural uranium, depleted uranium, natural thorium and their compounds, where the activity is distributed throughout the material. Such material is only subject to the low-level industrial package provisions and needs no criticality safety index when the fissile-excepted conditions are met. Irradiated fuel, activated core components and separated plutonium fall well outside this listing because of their activity concentration and fissile content.

Question 22Unconfirmed - official content outline not supplied for this exam

In Class 7 transport terminology, what does “conveyance” refer to?

  1. The individual overpack used to consolidate two or more packages
  2. The package together with its shielding and its transport index
  3. The consignor's declaration and the package approval certificate
  4. The vehicle or hold in which packages are carried Correct answer.

Explanation

In the transport regulations a conveyance is the means of carriage: the road or rail vehicle, the hold or compartment of a vessel, or the aircraft. It is not the package, the overpack or the paperwork, although those travel on or in the conveyance. The distinction matters because many operational limits, such as radiation levels and TI totals, are applied to the conveyance as a whole.

Question 23Unconfirmed - official content outline not supplied for this exam

How is removable surface contamination on a Class 7 package normally verified?

  1. By weighing the package before and after the journey and comparing the masses
  2. By passing a direct-reading survey meter over the surface and recording the highest rate
  3. By measuring the dose rate at one metre from the package surface
  4. By smearing a defined area and counting the smear in a counter Correct answer.

Explanation

Removable contamination is assessed by a smear or wipe test: an absorbent material is wiped over a known area, usually 100 cm², and the activity collected on it is counted to give a result in becquerels per square centimetre. A direct-reading instrument measures the radiation field and cannot separate fixed from removable contamination. The result is then compared with the applicable contamination limit for the radionuclide group.

Question 24Unconfirmed - official content outline not supplied for this exam

A package gives a maximum dose rate of 0.014 mSv/h at 1 m from its external surface. Which transport index (TI) must be assigned?

  1. 140
  2. 1.4 Correct answer.
  3. 0.14
  4. 14

Explanation

The transport index is obtained by multiplying the maximum dose rate at 1 m, expressed in millisieverts per hour, by 100 (the equivalent value in millirem per hour) and rounding up to the next 0.1. For 0.014 mSv/h this gives 0.014 × 100 = 1.4. The TI is a dimensionless number used for segregation, load planning and the 50-unit exclusive-use threshold.

Question 25Unconfirmed - official content outline not supplied for this exam

A road consignment is being loaded for ordinary (non-exclusive) use and the transport indexes of its packages add up to 56. Which requirement applies?

  1. Each package must be relabelled as III-YELLOW before loading
  2. The load must be carried under exclusive use from consignor to consignee Correct answer.
  3. Nothing extra is needed, because no single package exceeds TI 10
  4. The packages must be split between two vehicles before departure

Explanation

When the sum of transport indexes in a non-exclusive-use load exceeds 50, the consignment must be carried under exclusive use, which brings tighter control of access, stowage and radiation levels. The threshold applies to the total for the conveyance, not to individual package values. Relabelling packages or dividing the load does not reduce the dose rates that produced those transport indexes.

Question 26Unconfirmed - official content outline not supplied for this exam

An empty Class 7 packaging that previously held radioactive material is to be consigned. What is required?

  1. It may move as ordinary freight once the inner containment is removed and discarded
  2. It must be filled with inert gas and covered by a Type B(U) design certificate
  3. It must carry a II-YELLOW label and a Class 7 vehicle placard for the journey
  4. It must be in good condition, securely closed and marked “EMPTY” (UN 2908) Correct answer.

Explanation

An empty packaging that contained radioactive material is consigned as UN 2908 and must be in good condition, securely closed and marked “EMPTY” on the outside. Residual contamination must still be within the applicable removable contamination limits. Yellow labels and placards are not required because the dose rates associated with a loaded package are no longer present.

Question 27Unconfirmed - official content outline not supplied for this exam

Which of the following is classed as fissile-excepted without any further assessment of fissile mass per package?

  1. Uranium enriched to 90% uranium-235 as oxide powder
  2. Plutonium-239 metal buttons packed in a steel drum
  3. Uranium-233 nitrate solution in a sealed glass bottle
  4. Unirradiated natural uranium in the form of solid metal Correct answer.

Explanation

Natural uranium, depleted uranium and natural thorium fall within the fissile-excepted provisions because their uranium-235 enrichment is below the threshold and their plutonium and uranium-233 content is negligible, so no criticality safety index is assigned. Separated plutonium, uranium-233 and highly enriched uranium are fissile materials that require a CSI unless a specific mass or concentration exception is satisfied and demonstrated. The exception turns on the nature of the material, not on the packaging alone.

Question 28Unconfirmed - official content outline not supplied for this exam

Under the IAEA transport regulations, which statement about the radiation protection programme for Class 7 consignments is correct?

  1. It is required only when the consignment total exceeds a transport index of 50 in non-exclusive use
  2. It is required for all Class 7 transport and graded to dose magnitude and exposure likelihood Correct answer.
  3. It is required only for Type B packages and for consignments of fissile material
  4. It is replaced by the carrier's dangerous goods safety adviser certificate

Explanation

The transport of radioactive material must be subject to a radiation protection programme, and the content and extent of that programme are graded to the magnitude of the doses and the probability of exposure. It is a general obligation on consignors and carriers that exists independently of package category, transport index totals or the use of exclusive use. A dangerous goods adviser's certificate is a separate competence requirement and does not substitute for the programme.

Question 29Unconfirmed - official content outline not supplied for this exam

What distinguishes a Type C package design from a Type B package design?

  1. Type C adds a 90 m/s impact test plus a longer fire test, allowing air transport Correct answer.
  2. Type C is tested only for routine handling, through a 1.2 m drop and a stacking load
  3. Type C is approved only for fissile contents and is exempt from the immersion test
  4. Type C is a Type B design approved multilaterally for carriage on inland waterways

Explanation

A Type C design must survive the Type B test sequence plus an impact at 90 m/s onto an unyielding target and an 800 °C fire for 60 minutes rather than 30. Those additional tests reflect the more severe crash and fire environment assumed for air carriage of high-activity material. Approval is granted by the competent authority, and fissile content is handled separately through the criticality safety index.

Question 30Unconfirmed - official content outline not supplied for this exam

When may a Class 7 consignment be transported under “special arrangement”?

  1. When the consignor holds a Type A certificate but chooses a Type B route instead
  2. When the total transport index is below 1 and no label is required on the packages
  3. When compliance with the applicable requirements is impracticable and multilateral approval is granted Correct answer.
  4. When the packages are too large for exclusive use and must travel as full loads

Explanation

Special arrangement is the provision for consignments that cannot comply with the standard requirements; it requires multilateral approval by the competent authorities of the countries concerned and a demonstration that safety is not compromised. It is intended for genuinely exceptional cases, not as a convenience route or a way to bypass package performance standards. Modal conditions attached to the approval must be met in full.

Question 31Unconfirmed - official content outline not supplied for this exam

A Class 7 package has a maximum surface dose rate of 0.004 mSv/h and a transport index of 0. Which label category applies?

  1. Category II-YELLOW
  2. Category III-YELLOW
  3. Category II-YELLOW with a subsidiary I-WHITE label
  4. Category I-WHITE Correct answer.

Explanation

Category I-WHITE is used when the surface dose rate does not exceed 0.005 mSv/h and the transport index is zero. Higher dose rates or transport indexes move the package into II-YELLOW or III-YELLOW.

Question 32Unconfirmed - official content outline not supplied for this exam

In Class 7 transport, what is the main purpose of the transport index (TI)?

  1. To identify the chemical form of the radioactive contents for emergency planning
  2. To control accumulation and separation during transport and storage Correct answer.
  3. To state the package's external surface contamination limit in becquerels per square centimetre
  4. To record the total activity of the radionuclide in becquerels for the consignment

Explanation

The TI is a derived number based on the maximum dose rate at 1 m from the package surface. It is used to control accumulation and to establish separation distances during transport and storage.

Question 33Unconfirmed - official content outline not supplied for this exam

Who is responsible for classifying a Class 7 consignment, preparing its transport document, and ensuring the packages meet the applicable packing requirements?

  1. The vehicle driver assigned to the route
  2. The consignor offering the consignment for transport Correct answer.
  3. The consignee at the final destination
  4. The carrier receiving the packages at the terminal

Explanation

The consignor, sometimes called the offeror, is responsible for classification, documentation, packaging, marking, and labeling before the consignment is offered to the carrier. The carrier and driver have operational duties but do not take over the consignor's preparation duties.

Question 34Unconfirmed - official content outline not supplied for this exam

An overpack contains three Class 7 packages with transport indexes of 2, 3, and 4. No extra shielding is added. What TI must be assigned to the overpack?

  1. 4, the highest package transport index
  2. 9, the sum of the package transport indexes Correct answer.
  3. 0, because the packages are inside an overpack
  4. 3, the average of the package transport indexes

Explanation

For an overpack, the transport index is obtained by summing the transport indexes of the contained packages. The result controls accumulation and separation just as it does for individual packages.

Question 35Unconfirmed - official content outline not supplied for this exam

What does "exclusive use" mean in Class 7 transport?

  1. The vehicle contains no dangerous goods other than the Class 7 packages being carried
  2. Only one Class 7 package is loaded on the vehicle during the entire journey
  3. One consignor has sole use of the conveyance or large freight container Correct answer.
  4. The vehicle travels directly from the consignor to the consignee without intermediate stops

Explanation

Exclusive use means the sole use of a conveyance or large freight container by one consignor, with loading and unloading arranged under the consignor's or consignee's control. It does not mean a single package, a non-stop route, or merely the absence of other dangerous goods.

Question 36Unconfirmed - official content outline not supplied for this exam

Which test sequence is characteristic of the accident conditions that a Type B package design must withstand?

  1. A 9 m drop, a puncture test, and an 800°C fire for 30 minutes Correct answer.
  2. A vibration test for two hours and a 100°C oven test for 24 hours
  3. A 1.2 m free drop onto a rigid surface followed by a 50°C water spray for one hour
  4. A 0.3 m stacking test alone, followed by a five-minute immersion in shallow water

Explanation

Type B packages must survive both normal and accident conditions, including a 9 m drop onto an unyielding target, a puncture test, and a thermal test at 800°C for 30 minutes. These requirements are more severe than the normal-condition tests applied to Type A packages.

Question 37Unconfirmed - official content outline not supplied for this exam

In the IAEA Class 7 package activity limits, what does the A1 value represent?

  1. The maximum transport index allowed for a Category III-YELLOW package
  2. The maximum removable contamination allowed on an overpack surface
  3. The maximum activity of special form radioactive material permitted in a Type A package Correct answer.
  4. The maximum activity of non-special form radioactive material permitted in a Type A package

Explanation

A1 is the activity limit for special form radioactive material in a Type A package, while A2 is the corresponding limit for material other than special form. These values are radionuclide-specific and are used to decide whether a Type A package is adequate.

Question 38Unconfirmed - official content outline not supplied for this exam

Which description best matches "low dispersible radioactive material" in Class 7 transport?

  1. A material with no activity limit that requires no packaging or label
  2. A liquid radioactive material that is frozen before shipment to reduce leakage
  3. A tested solid or sealed capsule with limited dispersibility, not a powder Correct answer.
  4. A radioactive powder that disperses readily in air and is authorized only in a Type A package

Explanation

Low dispersible radioactive material is a solid or a sealed capsule that meets defined tests for limited dispersibility and is not a powder. The designation is used in package and activity-limit provisions; it is not a general label for powders or liquids.

Question 39Unconfirmed - official content outline not supplied for this exam

A radionuclide in non-special form has an A2 value of 1 × 10^11 Bq. A package is to contain 1.5 × 10^12 Bq of that material. Which package type is required?

  1. An industrial package, Type IP-1
  2. An excepted package
  3. A Type B package Correct answer.
  4. A Type A package

Explanation

The activity exceeds the A2 limit for non-special form material, so it cannot be shipped in a Type A package. A Type B package design is required unless another specific regulatory provision applies.

Question 40Unconfirmed - official content outline not supplied for this exam

Which set of tests is part of the normal conditions of transport for a Type A package design?

  1. A 15 m immersion test and a 1 m puncture test
  2. A 9 m drop, a puncture test, and an 800°C fire
  3. A 30-minute fire test and a high-velocity impact test
  4. Water spray, free drop, stacking, and penetration tests Correct answer.

Explanation

Type A packages must withstand normal transport conditions, which include water spray, free drop, stacking, and penetration tests. The 9 m drop, puncture, and 800°C fire tests belong to the accident conditions required for Type B packages.

Question 41Unconfirmed - official content outline not supplied for this exam

In Class 7 transport, what is the principal hazard communicated by the Class 7 label?

  1. Ionizing radiation hazard Correct answer.
  2. Chemical toxicity hazard
  3. Criticality hazard only
  4. Biological infection hazard

Explanation

Class 7 covers radioactive material, and the trefoil with the word RADIOACTIVE identifies the ionizing radiation hazard from the contents. Criticality is an additional concern only for fissile consignments, while chemical and biological hazards belong to other dangerous goods classes.

Question 42Unconfirmed - official content outline not supplied for this exam

Which package category is intended for transporting relatively small quantities of radioactive material with activity not exceeding the applicable A1 or A2 limit?

  1. Type B(U) package
  2. Type A package Correct answer.
  3. Type C package
  4. Industrial package IP-3

Explanation

A Type A package is designed to withstand normal conditions of transport and may contain activity up to the A1 or A2 limit, as applicable. Type B and Type C designs are for higher activity and require accident-condition performance and competent authority approval.

Question 43Unconfirmed - official content outline not supplied for this exam

A consignment contains a Type B(U) package with non-fissile material. Which UN number and proper shipping name are correct?

  1. UN 2915, Radioactive material, Type A package, non-special form, non-fissile or fissile-excepted
  2. UN 2913, Radioactive material, surface contaminated objects (SCO-I or SCO-II), non-fissile or fissile-excepted
  3. UN 2916, Radioactive material, Type B(U) package, non-fissile or fissile-excepted Correct answer.
  4. UN 2912, Radioactive material, low specific activity (LSA-I), non-fissile or fissile-excepted

Explanation

The proper shipping name for a Type B(U) package carrying non-fissile or fissile-excepted material is 'Radioactive material, Type B(U) package, non-fissile or fissile-excepted', UN 2916. UN 2915 is used for Type A non-special form, UN 2912 for LSA-I, and UN 2913 for SCO.

Question 44Unconfirmed - official content outline not supplied for this exam

What does the criticality safety index (CSI) of a package or overpack represent?

  1. The activity of fissile material in the package, in becquerels
  2. The removable contamination on the package surface
  3. The dose rate at one metre from the package surface
  4. A grouping limit for fissile packages to prevent criticality Correct answer.

Explanation

The criticality safety index is a number assigned to packages and overpacks containing fissile material. It is used to limit how many such packages may be grouped in a vehicle or store so that criticality safety is maintained; it is not a dose-rate or contamination measurement.

Question 45Unconfirmed - official content outline not supplied for this exam

What is the purpose of an industrial package such as IP-1, IP-2 or IP-3 in Class 7 transport?

  1. To replace Type C packages in air transport
  2. To transport fissile material only under special arrangement
  3. To carry high-activity sealed sources without an activity limit
  4. To carry LSA material and SCO Correct answer.

Explanation

Industrial packages IP-1, IP-2 and IP-3 are used for low specific activity material and surface contaminated objects, with increasing levels of containment and performance. They are not substitutes for Type C air packages or for high-activity sealed-source packages.

Question 46Unconfirmed - official content outline not supplied for this exam

What is a surface contaminated object (SCO) in Class 7 transport?

  1. A solid object whose surfaces carry radioactive material Correct answer.
  2. A package containing only natural uranium
  3. A sealed source used in radiotherapy
  4. A liquid radioactive waste in a Type A package

Explanation

A surface contaminated object is a solid object that is not itself radioactive material but has radioactive material distributed on its surfaces. It is classified as SCO-I or SCO-II according to the contamination levels and is carried in an appropriate package.

Question 47Unconfirmed - official content outline not supplied for this exam

Under the IAEA transport regulations, what is the general non-fixed contamination limit for beta and gamma emitters on the external surface of a Class 7 package?

  1. 400 Bq/cm2
  2. 4 Bq/cm2 Correct answer.
  3. 0.4 Bq/cm2
  4. 40 Bq/cm2

Explanation

For non-fixed contamination on package external surfaces, the general IAEA limit is 4 Bq/cm2 for beta and gamma emitters and low-toxicity alpha emitters, and 0.4 Bq/cm2 for other alpha emitters. These limits apply to the average over the accessible surface area.

Question 48Unconfirmed - official content outline not supplied for this exam

What is the maximum radiation level normally permitted at the external surface of a Class 7 package during routine transport, unless the consignment is under exclusive use?

  1. 0.005 mSv/h
  2. 1 mSv/h
  3. 0.5 mSv/h
  4. 2 mSv/h Correct answer.

Explanation

Under routine transport, the radiation level at the external surface of a Class 7 package must not exceed 2 mSv/h, except under exclusive use where higher levels up to 10 mSv/h may be allowed subject to conditions. The 0.005 mSv/h value relates to the White-I category, not the general package limit.

Question 49Unconfirmed - official content outline not supplied for this exam

When Class 7 packages are placed inside an overpack, what must be done with the required labels?

  1. No labels are needed if the overpack is closed
  2. Remove all labels from the inner packages
  3. Reproduce or keep visible the required labels Correct answer.
  4. Replace the Class 7 labels with an 'OVERPACK' label

Explanation

When packages are placed in an overpack, the required Class 7 labels must either remain visible or be reproduced on the outside of the overpack. The overpack must also be marked with the word OVERPACK and, where relevant, the UN number and proper shipping name.

Question 50Unconfirmed - official content outline not supplied for this exam

What is special form radioactive material in Class 7 transport?

  1. Any material in a Type B package
  2. A solid, non-dispersible material meeting tests Correct answer.
  3. A liquid in a sealed vial
  4. Material with activity below A2

Explanation

Special form radioactive material is a solid, non-dispersible radioactive material or a sealed capsule that meets specified impact, percussion and heating tests. It is not simply any material in a Type B package, and it is not defined by activity below A2.