X-Ray Image Interpretation Flashcards

Which of the following liquids, if present in a container on X-ray, would be MOST difficult to distinguish from a homemade liquid explosive?

Answer: Water, because its X-ray density closely resembles many liquid explosive compounds

Water and many liquid explosives have similar densities, making X-ray alone insufficient to differentiate them; ETD testing may be required.

When a TSO is reviewing an X-ray and sees a knife blade, the blade will typically appear:

Answer: As a thin, elongated, high-density (bright/white) object with a sharp taper at one end

Metal knife blades are thin, elongated, highly attenuating objects that produce a bright profile with a characteristic tapered point.

A TSO detects what appears to be a firearm magazine loaded with cartridges in a carry-on bag. The correct procedure is to:

Answer: Alarm the lane, notify a supervisor, and follow the prohibited item resolution process

Firearms and ammunition are prohibited in carry-on baggage; the item must be resolved through the prohibited item process regardless of permits.

What visual characteristic helps distinguish a grenade from a similarly sized bottle or canister on an X-ray image?

Answer: Grenades display a segmented or textured outer casing, a dense fill, and often a visible fuze or pin assembly

Grenades have a characteristic segmented body, dense explosive fill, and fuze hardware that differentiates them from common cylindrical containers.

Why are TSOs required to maintain image interpretation proficiency through regular recurrent training?

Answer: Threat items evolve, and human detection performance degrades without regular practice and updated threat libraries

Threat item designs change over time and vigilance decays without practice; recurrent training ensures officers remain effective against current threats.

An X-ray image reveals what appears to be a clump of wires connected to a timing device and a putty-like mass. The FIRST priority action is:

Answer: Do not touch the bag; activate the alarm, clear the area, and contact a supervisor and law enforcement immediately

Wiring connected to a timer and a plastic-explosive-like mass is a potential IED; the immediate priority is personnel safety and law enforcement notification.

On an X-ray image, a dense object is partially hidden behind a shoe. What is the recommended technique to better evaluate the obscured item?

Answer: Ask the passenger to remove the shoe from the bag so both items can be screened separately

Separating overlapping items through a physical bag check or re-screening resolves superimposition and ensures thorough evaluation of both objects.