Which option best describes the purpose of shielding?

Which option best describes the purpose of shielding?

• A. Shielding should be placed between radiation sources and exposed to absorb or attenuate radiation
• B. Shielding reduces exposure by increasing distance
• C. Shielding increases exposure time
• D. Shielding is optional in radiologic procedures

Answer: (A)

Shielding works by creating a barrier that absorbs or attenuates the x-ray beam before it reaches the exposed person, thereby reducing the radiation dose. The material and thickness are chosen to provide the needed attenuation for the energy involved—lead is commonly used because of its high density and atomic number, which make it very effective at stopping or weakening photons. This attenuation happens as photons pass through the shielding, so the barrier sits between the radiation source and the person being protected, such as a staff member or patient. Keep in mind that other ways to reduce exposure exist, like increasing distance from the source, which lowers dose according to the inverse-square law, or minimizing exposure time. Shielding itself does not increase exposure time, and it is not optional in radiologic procedures.

Shielding works by creating a barrier that absorbs or attenuates the x-ray beam before it reaches the exposed person, thereby reducing the radiation dose. The material and thickness are chosen to provide the needed attenuation for the energy involved—lead is commonly used because of its high density and atomic number, which make it very effective at stopping or weakening photons. This attenuation happens as photons pass through the shielding, so the barrier sits between the radiation source and the person being protected, such as a staff member or patient.

Keep in mind that other ways to reduce exposure exist, like increasing distance from the source, which lowers dose according to the inverse-square law, or minimizing exposure time. Shielding itself does not increase exposure time, and it is not optional in radiologic procedures.