RSO Radiation Biology and Health Effects 2

Question 1

The term 'effective dose' accounts for which two factors beyond absorbed dose?

Accepted Answer

Radiation weighting factor and tissue weighting factor

Answer

Effective dose is calculated by multiplying absorbed dose by a radiation weighting factor (for radiation type) and then by tissue weighting factors (for organ sensitivity) to give a single risk estimate.

Question 2

Which of the following is a deterministic radiation effect?

Accepted Answer

Cataract of the eye lens

Answer

Cataracts are a deterministic effect with a threshold dose, meaning they only occur above a certain dose level, and severity increases with dose above that threshold.

Question 3

In radiobiology, the 'four Rs' of radiobiology include repair, reoxygenation, redistribution, and:

Accepted Answer

Repopulation

Answer

The four Rs of radiobiology are repair of sublethal damage, reoxygenation of hypoxic cells, redistribution of cells through the cell cycle, and repopulation of surviving cells.

Question 4

The tissue weighting factor (wT) for the gonads in ICRP Publication 103 is:

Accepted Answer

0.08

Answer

ICRP Publication 103 assigns gonads a tissue weighting factor of 0.08, reflecting their contribution to total detriment-adjusted risk from uniform whole-body irradiation.

Question 5

Which radiation-induced DNA lesion is considered the most biologically significant for cell killing and carcinogenesis?

Accepted Answer

Double-strand break

Answer

Double-strand breaks (DSBs) are the most critical DNA lesions because both strands are severed, making faithful repair difficult and increasing the risk of chromosomal aberrations.

RSO - Radiation Safety Officer Practice Test

RSO - Radiation Safety Officer Practice Test

RSO Radiation Biology and Health Effects 2