TSA CBT Practice Test

What is represented by the color green in X-Ray imaging?

1. Denser metals

2. Less dense plastics and alloys

3. Biological materials

4. Organic materials

The correct answer is: Less dense plastics and alloys

In X-ray imaging, the color green typically represents materials that are less dense compared to other substances. This includes certain types of plastics and alloys, which allow more X-rays to pass through as opposed to denser materials. In the context of an X-ray, denser materials absorb more X-rays and appear darker on the image, while less dense materials do not absorb them as effectively, resulting in a lighter appearance, which can manifest as green in some imaging systems. Understanding the color representation in X-ray images is crucial for interpreting the materials being examined and can assist in identifying both the composition and density of various objects, particularly in fields like security screening and medical imaging.