Science & Education
Section 3 Radiation Induced Injury Answers and
1. ANSWER: A-TRUE, B-TRUE, C-TRUE, D-TRUE
FEEDBACK: Stochastic effects are effects for which there is no threshold and
for which the severity of the effects does not depend on dose, although the
probability that the effects will occur does. Stochastic effects include
heritable effects and carcinogenesis, but not cell killing. All biologic
effects, stochastic or otherwise, depend on all four factors: dose, LET, dose
rate, and type of tissue exposed. All
options are True.
2. ANSWER: A-FALSE, B-TRUE, C-FALSE, D-TRUE
FEEDBACK: In a general dictionary, stochastic is simply defined as “random.” In
radiation protection, it has taken on a special specific meaning and applies
to carcinogenesis and hereditary effects. A stochastic effect is an
all-or-nothing effect. The severity of the effect is not dose related; option A is False. However, the
probability of the effect occurring increases with dose; option B is True. There is no dose below which the effect
cannot occur (i.e., there is no threshold); option C is False. Damage to a small number of cells, even
one cell, can cause the effect; option
D is True.
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