Which kVp level demonstrates the highest attenuation percentage from a 0.5-mm apron?

The kVp (kilovolt peak) level that demonstrates the highest attenuation percentage from a 0.5-mm apron is 50 kVp. At lower kVp levels, such as 50 kVp, X-ray photons are less energetic, which means they are more likely to be absorbed or attenuated by materials such as lead, which is contained in the apron.

As the kVp increases, the energy of the X-ray photons also increases, leading to a greater likelihood of penetrating the protective material rather than being absorbed. Consequently, higher kVp settings like 75, 100, and especially 150 kVp allow more photons to pass through the apron, thus resulting in lower attenuation percentages.

This concept is critical in understanding how protective garments function and the importance of selecting appropriate kVp settings to ensure adequate radiation safety. In this context, 50 kVp would yield the maximum protection from a 0.5-mm apron.