ASNT Industrial Radiography Radiation Safety Practice Test

What is the expected penetrating power in steel for X-ray energies between 50 kV to 150 kV?

1. 1/16 in. to 1/4 in.

2. 1/4 in. to 1/2 in.

3. 1/8 in. to 3/4 in.

4. 1/2 in. to 1 in.

The correct answer is: 1/8 in. to 3/4 in.

The expected penetrating power of X-rays in steel at energies between 50 kV to 150 kV typically falls within the range of 1/8 inch to 3/4 inch. This range reflects the ability of X-ray photons to penetrate materials, which is influenced by the energy of the X-rays and the density of the material being penetrated. At lower energies around 50 kV, the penetration capability is limited, whereas as the energy increases toward 150 kV, the photons have more energy and can penetrate deeper into materials such as steel. Therefore, the range of 1/8 inch to 3/4 inch captures the practical depth of penetration for industrial radiography applications effectively, making it feasible for detecting flaws or discontinuities within the steel. This range is widely used as a benchmark in the industry, ensuring that radiographic examinations can adequately assess the integrity of steel components in various applications, from structural assessments to quality control in manufacturing.