RADIATION PROTECTION: ARRT
BOARD EXAM 2025 QUESTIONS AND
ANSWERS
Radiation-Induced biologic damage to living organisms is termed ______ effects. -
ANS somatic
Non-stochastic effects may also be referred to as ______ effects. - ANS deterministic
Lens of eye annual dose: _____ mSv - ANS 150
Embryo/fetus 1 month dose: _____ mSv - ANS 0.5
Thyroid annual dose: _______ mSv - ANS 500
Gonads annual dose: ______ mSv - ANS 50
Skin, hands, and feet annual dose: _____ mSv - ANS 500
Somatic effects that occur within minuites, hours, days or weeks after initial irradiation are
termed _______. - ANS early, or shirt term effects
What minimum radiation dose is required in order for acute radiation syndrome (ARS) to occur?
- ANS 100 rad (1 Gy)
1 Copyright ©BRIGHSTARS ALL RIGHTS RESERVED 2025
, The latent period (in ARS) decreases as radiation exposure _______. - ANS Increases
How does oxygenation affect cell/tissue radiosensitivity? - ANS The presence of oxygen
increases cell/tissue radiosensitivity.
What is the LD 50/30 for adult humans? - ANS 300 to 400 rad (3-4 Gy)
A dose of 200 rad (2 Gy) to the skin can cause a radiation-induced reddening, termed
_________. - ANS erythema
Ionizing radiation-induced hair loss is termed _______. - ANS epilation or alopecia
What is the name of the particularly radiosensitive male sex cell? - ANS Spermatogonia
What is the target organ believed responsible for radiation-induced leukemia? - ANS Bone
Marrow
What radiation exposure dose to the ovaries will result in temporary infertility? - ANS 200
rad (2 Gy)
In which portion of pregnancy is the embryo/fetus most radiosensitive? - ANS The first
trimester
What is defined as "the estimated dose to the gonads that, if received by the total population
gene pool, would produce the total genetic effect on the population as the sum of the
individual doses actually recieved"? - ANS Genetically significant dose (GSD)
2 Copyright ©BRIGHSTARS ALL RIGHTS RESERVED 2025
BOARD EXAM 2025 QUESTIONS AND
ANSWERS
Radiation-Induced biologic damage to living organisms is termed ______ effects. -
ANS somatic
Non-stochastic effects may also be referred to as ______ effects. - ANS deterministic
Lens of eye annual dose: _____ mSv - ANS 150
Embryo/fetus 1 month dose: _____ mSv - ANS 0.5
Thyroid annual dose: _______ mSv - ANS 500
Gonads annual dose: ______ mSv - ANS 50
Skin, hands, and feet annual dose: _____ mSv - ANS 500
Somatic effects that occur within minuites, hours, days or weeks after initial irradiation are
termed _______. - ANS early, or shirt term effects
What minimum radiation dose is required in order for acute radiation syndrome (ARS) to occur?
- ANS 100 rad (1 Gy)
1 Copyright ©BRIGHSTARS ALL RIGHTS RESERVED 2025
, The latent period (in ARS) decreases as radiation exposure _______. - ANS Increases
How does oxygenation affect cell/tissue radiosensitivity? - ANS The presence of oxygen
increases cell/tissue radiosensitivity.
What is the LD 50/30 for adult humans? - ANS 300 to 400 rad (3-4 Gy)
A dose of 200 rad (2 Gy) to the skin can cause a radiation-induced reddening, termed
_________. - ANS erythema
Ionizing radiation-induced hair loss is termed _______. - ANS epilation or alopecia
What is the name of the particularly radiosensitive male sex cell? - ANS Spermatogonia
What is the target organ believed responsible for radiation-induced leukemia? - ANS Bone
Marrow
What radiation exposure dose to the ovaries will result in temporary infertility? - ANS 200
rad (2 Gy)
In which portion of pregnancy is the embryo/fetus most radiosensitive? - ANS The first
trimester
What is defined as "the estimated dose to the gonads that, if received by the total population
gene pool, would produce the total genetic effect on the population as the sum of the
individual doses actually recieved"? - ANS Genetically significant dose (GSD)
2 Copyright ©BRIGHSTARS ALL RIGHTS RESERVED 2025
