American Society for Nondestructive Testing (ASNT) Radiographic Testing Practice Test

The penetration of x-rays through a material is significantly influenced by the density of that material. Denser materials have a greater atomic mass and closely packed atoms, which increases the likelihood of x-rays interacting with the atoms as they attempt to pass through. This leads to higher absorption of x-rays and reduces their penetration depth. Consequently, materials with lower density will allow x-rays to penetrate more easily, resulting in clearer radiographic images.

While factors like color, temperature, and age of a material can affect its overall properties or application in various settings, they do not directly impact the interaction of x-rays with the material at a fundamental level. Therefore, density emerges as the primary property that determines the extent to which x-rays can penetrate a given material.