# Shared Flashcard Set

## Details

Risk Estimates
Methods of summarizing risk of effects from radiation exposure based on epidemiological studies.
10
Physics
11/08/2008

Term
 Name the 3 types of risk estimate methods used to describe the risk of an effect from radiation exposure.
Definition
 1. Relative risk2. Absolute risk3. Excess risk
Term
 Which type of risk estimate method is used most often?
Definition
 Relative risk (RR)
Term
 Which type of risk estimate is used when we don't have any knowledge of the dose received? (i.e. accident victims)
Definition
 Relative risk (RR)
Term
 How is relative risk calculated?
Definition
 # of observed cases/# of expected cases
Term
 If the expected (natual) risk of developing leukemia for a nonradiated group is 4 in 100,000, and the observed cases in a radiated group is 8 in 100,000, what is the relative risk?
Definition
 8/4=2
Term
 Which type of risk estimate is used when we do have knowledge of the dose received?
Definition
 Absolute risk
Term
 Absolute risk is expressed as the # of cases per ***?
Definition
Term
 What does an absolute risk of 2 mean?
Definition
 If 1 million people were exposed to 1 RAD over 1 year, we would expect to see 2 cases of the effect in question.
Term
 When is excess risk used?
Definition
 When a very large number of cases of a certain effect are seen after radiation exposure.
Term
 How is excess risk calculated?
Definition
 Total observed cases in the radiated group minus number of expected (endemic) cases for a group that size.
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