Opening a new radiography room: licensing, dose limits and a high badge reading
A 200-bed district hospital has installed a new digital radiography room with a lead-lined wall and a ceiling-mounted tube. The hospital wants to start routine radiography within three weeks. Six radiographers have been recruited; two qualified last year and have never worn a personnel monitoring badge. The room's layout plan has been prepared by the equipment supplier, and the hospital administrator believes that "buying the machine from an approved company is enough to start". The old radiography room, which had no licence, was closed after an inspection. The hospital also plans to start a mobile radiography service for the intensive care unit. The chief radiographer has been asked to prepare a compliance checklist before the first patient is exposed. She is not sure which authority to approach, what dose limits apply to staff and the public, and how often badges must be changed. She also needs to know what to do if a badge report later shows an unexpectedly high reading for one worker.
1. Which authority must the hospital approach, under what framework, and what approvals are needed before the first exposure?
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The authority is the Atomic Energy Regulatory Board (AERB), functioning under the Department of Atomic Energy. The legal framework is the Atomic Energy Act, 1962, with radiation protection requirements set out in the Atomic Energy (Radiation Protection) Rules, 2004. Diagnostic radiology installations are licensed through AERB's online eLORA system.
Approvals are sequential, not a single purchase:
- Type approval of the equipment - the machine model must be approved for use in India; a supplier's reputation is not the same as type approval.
- Layout approval - the room plan, shielding, workload and occupancy factors must be assessed and approved. The supplier's drawing is an input, not an approval.
- Licence to operate - once the layout is approved and the room is commissioned, the hospital needs a licence and a named Radiation Safety Officer (RSO) responsible for the installation.
- Commissioning and quality-assurance tests before clinical use, plus a personnel monitoring programme for every worker.
The mobile service also needs to be included; it is not covered automatically by the fixed-room licence. Starting work on the strength of the purchase order alone would repeat the violation that closed the old room.
2. State the dose limits that apply and explain the monitoring arrangements for the six radiographers.
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Occupational limit. For a classified radiation worker, the effective dose is limited to 20 mSv per year, averaged over five consecutive years (100 mSv in five years). This is an average, not a target: a single year should not be used to bank dose for later.
Public limit. Members of the public, including patients' escorts and staff who are not radiation workers, are limited to 1 mSv per year above background.
Declared pregnancy. Once a worker formally declares pregnancy, the working conditions must be adjusted so that the dose to the fetus remains about 1 mSv for the remainder of the pregnancy.
Monitoring. All six radiographers, including the two new graduates, must wear a whole-body thermoluminescent dosimeter (TLD) badge, changed quarterly (every three months) in India. Badges are worn at chest or waist level, are not shared, and must not be left on the apron or near the tube. A control badge kept outside the radiation area helps distinguish genuine exposure from badge mishandling. The RSO maintains the dose registry, and the records must be available for inspection.
The principle is that dose is measured, recorded and reviewed - not assumed to be low because the room is new.
3. Six months later, one radiographer's quarterly badge report reads 25 mSv. What should happen?
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25 mSv in one quarter, if repeated, would annualise to about 100 mSv, so it cannot be treated as routine. The response should be systematic:
1. Verify the reading. Check whether the badge was worn correctly, stored near the tube or left in the room, shared, or sent late. Issue a fresh badge and a control badge. A clerical or storage error is common and must be excluded before the worker is labelled overexposed.
2. Investigate the work pattern. Review the radiographer's workload, fluoroscopy time, use of lead apron and thyroid shield, whether they held patients during exposures, and whether the mobile service was involved. Look at the room's shielding and at whether other workers show a similar trend.
3. Escalate. Inform the RSO and the employer's medical officer; record the finding in the dose registry. If the dose is confirmed and approaches or exceeds the regulatory limit, the worker is removed from radiation work pending advice, and the case is reported to AERB as required.
4. Correct and follow up. Fix the cause, retrain if necessary, and monitor the next badge closely. The purpose is to prevent recurrence, not merely to record the number.