TSA CBT Practice Test

Which X-ray color is associated with dense, hard materials like metal and alloys?

1. Green

2. Blue/Black

3. Orange

4. Red

The correct answer is: Blue/Black

The color blue or black in X-ray imaging is associated with dense, hard materials such as metals and alloys. In the context of X-ray imaging, different materials absorb X-rays to varying degrees based on their density and atomic number. Dense materials, like metals, absorb a significant amount of X-rays, resulting in less penetrability and a stronger contrast on the X-ray images. This contrast manifests as blue or black areas, distinguishing them from softer or less dense materials, which typically appear lighter in color on the image. The other colors listed do not specifically relate to dense, hard materials. Instead, they are often indicative of softer materials or varying levels of absorption, making them less relevant in identifying metals and alloys in X-ray imagery.