TSA TSO CBT key terms

How much radiation a material blocks; denser or thicker materials appear darker on the screen because less energy reaches the detector. Screeners use density differences to separate solid objects from lighter ones.

The use of color or image cues to tell what an object is made of, such as organic, inorganic, or metal. It helps a screener decide whether a shape is a threat or an ordinary item.

A basic material grouping in X-ray images. Organic items (food, plastic, most explosives) typically show in one color range, while inorganic items (glass, metal, stone) show in another.

Describes an area where the X-ray beam is fully blocked and nothing behind it can be seen. Screeners should treat opaque regions as hidden space that may conceal prohibited items.

A crowded image where many objects overlap and make individual items hard to pick out. Screeners manage clutter by rotating the bag, changing the view, or asking for a bag search.

Changing the angle of the X-ray view to look at a bag from a different direction. Rotating can separate overlapping objects and reveal shapes that were hidden in the first view.

Choosing among available image perspectives, such as top-down or side views, to get the clearest look at a bag. Different views expose different objects and reduce the chance of a miss.

A training feature that inserts images of prohibited items into real screening images without telling the screener. It measures whether screeners reliably detect threats during normal work.

Any object that rules forbid from being carried past the checkpoint, such as weapons, explosives, or banned tools. Screeners must recognize these across many shapes and orientations.

Identifying a blade by its straight or curved edge, pointed tip, handle, and thin profile. Knives often appear as a bright thin line and may be partly hidden by other objects.

Spotting the barrel, trigger guard, grip, and magazine shape that mark a gun in an X-ray image. Guns are usually dense metal and can be broken into parts across a bag.

A prohibited item split into separate parts and packed apart to avoid detection. Screeners must mentally connect components, such as a barrel and grip, that appear in different areas.

A banned or dangerous liquid, such as a flammable or explosive substance, carried in a container. Screeners check container type, fill level, and labeling against the rules in force.

The process of deciding whether a flagged image or machine alert is a real threat or a harmless item. It ends in clearing the bag or referring it for search.

A machine alert or screener concern that turns out to be a harmless item, such as wiring or a dense food product. Tracking false alarms helps balance security with speed.

The share of planted or real threats that a screener correctly identifies. It is a core measure of screening performance and is tracked through testing programs.

Systematically sweeping the eyes across an image or area in a set pattern rather than staring at one spot. It reduces missed items caused by looking only where attention is drawn.

What you can see outside the point you are directly looking at. It is good at catching motion and large shapes but poor at fine detail, so screeners must move their gaze.

Failing to notice an unexpected object because attention is focused on something else. It explains how a screener can look at an image and still miss a visible prohibited item.

Not noticing that something in a scene or image has changed. Screeners avoid it by comparing views carefully and rechecking images instead of relying on memory.

The ability to stay alert and keep detecting rare events over long periods. Vigilance drops with fatigue and monotony, so breaks and rotation of duties help maintain performance.

The decline in attention and detection accuracy that grows the longer a person monitors a task. It is a normal effect and is managed through rest, rotation, and varied duties.

Physical or mental tiredness that slows reactions and increases errors. Screeners must report fatigue and use breaks, since tiredness directly weakens detection and judgment.

The skill of matching what you see to known shapes and layouts stored from experience. It lets screeners quickly classify common items and flag unusual ones.

Something in an image or scene that does not fit the expected pattern, such as an odd shape or misplaced object. Anomalies are cues to look closer or escalate.

Knowing what is happening around you and how it might develop next. At a checkpoint it means tracking passengers, queues, bags, and coworkers while staying focused on the task.

Choosing a course of action under time pressure and incomplete information. Screeners weigh risk, rules, and consequences, then act and take responsibility for the result.

Passing a concern to a supervisor or higher authority when a situation exceeds your role or knowledge. Escalating early is preferred over guessing on a possible security risk.

The defined line of authority for reporting and getting direction. Knowing it lets a worker raise issues to the right person quickly and avoids acting outside authority.

Written steps that describe how a task must be done, including safety and security rules. Following SOPs keeps actions consistent and defensible even when a worker feels rushed.

Deciding which task or person to handle first based on risk and impact. Security concerns usually outrank speed or convenience, and urgent safety issues outrank routine requests.

Calming a tense interaction using a calm voice, space, and clear language before it becomes a safety problem. It protects passengers, staff, and the flow of the checkpoint.

Working through a disagreement with a passenger or coworker to reach a workable outcome. It relies on listening, stating facts, and offering options within the rules.

Giving full attention to a speaker, then confirming what you heard by restating it. It reduces misunderstandings with passengers and coworkers and helps resolve complaints faster.

Understanding the meaning of written text such as notices, procedures, and forms. The exam tests pulling out key facts, following instructions, and drawing simple conclusions.

A conclusion you draw from clues in a text rather than from a direct statement. Questions may ask what a passage suggests about a rule, a person's intent, or a result.

The central point a paragraph or notice is making. Identifying it helps a reader answer questions quickly and ignore details that do not affect the meaning.

Treating passengers with courtesy, respect, and helpfulness while still enforcing the rules. It means explaining procedures clearly and staying professional even when a request is denied.

Behaving reliably, respectfully, and within policy at all times, including under stress. It covers appearance, language, honesty, and keeping calm during conflict.

Adjusting how screening is done so passengers with disabilities or medical needs can be screened fairly and safely. Staff follow set procedures and offer alternatives without weakening security.