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  • Section 3 Radiation Induced Injury Answers and Feedback

  • Section 3 Radiation Induced Injury Answers and Feedback 

    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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