RSO Radiation Biology and Health Effects

Question 1

What term describes the ability of ionizing radiation to cause biological damage by directly breaking chemical bonds in DNA?

Accepted Answer

Direct action

Answer

Indirect action

Answer

Linear energy transfer

Answer

Relative biological effectiveness

Question 2

Which type of radiation has the highest relative biological effectiveness (RBE) for causing biological damage?

Accepted Answer

Alpha particles

Answer

X-rays

Answer

Gamma rays

Answer

Beta particles

Question 3

The linear no-threshold (LNT) model assumes that radiation risk is:

Accepted Answer

Proportional to dose at all levels with no safe threshold

Answer

Zero below a threshold dose

Answer

Inversely proportional to dose rate

Answer

Constant regardless of dose

Question 4

Acute radiation syndrome (ARS) typically requires a whole-body dose of at least:

Accepted Answer

1 Sv

Answer

10 mSv

Answer

100 mSv

Answer

0.1 mSv

Question 5

Which organ system is most sensitive to radiation-induced damage in adults, making it the primary determinant of survival after high acute doses?

Accepted Answer

Hematopoietic (bone marrow) system

Answer

Cardiovascular system

Answer

Respiratory system

Answer

Nervous system

Question 6

Stochastic radiation effects such as cancer are characterized by:

Accepted Answer

Probability increasing with dose but severity independent of dose

Answer

A threshold dose below which they cannot occur

Answer

Severity increasing with dose

Answer

Occurrence only after acute exposures