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You are Here :: Home :: Registration & Training :: General Radiation Safety for Clinical Center Employees :: E. Biological Effects and Risks of Ionizing Radiation


E. Biological Effects and Risks of Ionizing Radiation

In general, small quantities of radioactive materials are used at the NIH. Consequently, individuals working at NIH receive small doses of external ionizing radiation, an average of less than 5-10 mrem per year. No biological effects are expected at these low dose levels.
Risk From Radiation Exposure
1. The American Cancer Society estimates that 25% of all adults will develop cancer at some time from all possible causes such as smoking, drugs, alcohol, and pollutants.
2. If an individual's cumulative occupational radiation dose is 1000 millirem, the chances of eventually developing cancer during their lifetime may have increased from 25 % to 25.05% (NCRP 116, p.31).
3. Refer to the NRC REGULATORY GUIDE 8.29 on "Instruction Concerning Risks from Occupational Radiation Exposure," and NRC REGULATORY GUIDE 8.13 on "Instruction Concerning Prenatal Radiation Exposure". These documents are available from the Radiation Safety Training Office by calling 496-2255.


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