Radiation Protection and Safety Flashcards

Protective lead shielding should be placed between the radiation source and a fertile woman's gonads when the gonadal dose would exceed:

Answer: 5 mGy (0.5 rad) during the entire pregnancy

Gonadal shielding should be used when the gonads are within 5 cm of the primary beam or when the gonadal dose would exceed 5 mGy (0.5 rad) during the gestation period.

The declared pregnant radiation worker has a monthly dose equivalent limit of:

Answer: 0.5 mSv (0.05 rem)

NCRP recommends a monthly dose limit of 0.5 mSv (50 mrem) for the embryo/fetus of a declared pregnant radiation worker.

Which device provides an immediate, real-time readout of radiation dose during a procedure?

Answer: Pocket ionization dosimeter

Pocket ionization dosimeters (pocket dosimeters) provide an immediate readout of accumulated dose during a procedure.

What is the recommended practice for wearing a radiation monitoring badge during fluoroscopy when wearing a lead apron?

Answer: Wear two badges: one outside at collar, one under apron at waist

During fluoroscopy, two badges are recommended: one at collar level outside the apron and one under the apron at waist level to accurately estimate effective dose.

Primary radiation barriers must attenuate the useful beam to what level?

Answer: The primary barrier must reduce transmission to 1 mSv/week

Primary barriers are designed to reduce the transmitted primary beam to an acceptable level, typically 1 mSv (0.1 rem) per week for controlled areas.

Coherent (classical) scattering differs from Compton scattering in that coherent scattering:

Answer: Produces no ionization and the scattered photon has the same energy as the incident photon

In coherent (classical) scattering, the photon is redirected without ionization; the scattered photon retains the same energy as the incident photon.