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RISK FROM RADIATION EXPOSURE PowerPoint Presentation
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RISK FROM RADIATION EXPOSURE

RISK FROM RADIATION EXPOSURE

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RISK FROM RADIATION EXPOSURE

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Presentation Transcript

  1. RISK FROM RADIATION EXPOSURE

  2. Introduction • Myths created by the film industry • Spider Man, The Hulk, Teenage Mutant Ninja Turtles • Radioactive Material Glows

  3. Risk • The statistical probability that personal injury will result from some action • smoking, speeding, extreme sports, ect. • ionizing radiation exposure

  4. Ionizing Radiation Exposure Effects • Somatic Effect (Prompt or Delayed) • Stochastic Effect (Cancer) - probability of effect occurring increases as doses increases. No Threshold • Non-Stochastic Effect (Cataracts) - severity of the effect varies with dosage. Threshold dose • Teratogenic Effects(Offspring while in-utero) • mental retardation • malformations

  5. Ionizing Radiation Exposure Effects (Con’t) • Genetic Effects (Future Generations) • Anemia • Epilepsy • Diabetes • Asthma

  6. Ionizing Radiation Exposure Effects (Con’t) • Genetic Effects (Future Generations) • Anemia • Epilepsy • Diabetes • Asthma • Natural genetic mutation rate (U.S.) - 10.5%

  7. Ionizing Radiation Exposure Effects (Con’t) • Genetic Effects (Future Generations) • Anemia • Epilepsy • Diabetes • Asthma • Natural genetic mutation rate (U.S.) - 10.5% • No genetic effects witnessed in humans

  8. Physical Factors of Effects • Acute dose vs. Chronic Dose

  9. Physical Factors of Effects • Acute dose vs. Chronic Dose • Whole body irradiation vs. partial body irradiation

  10. Problems with Models • Cancers are indistinguishable • Ionizing radiation is not only cause of cancer • Long latency period of cancer • Cannot perform human experiment • Studies may suggest radiation as the cause of cancer but cannot identify

  11. Cancer Facts What is cancer? - uncontrolled growth and spread of abnormal cells • Causes - Many Risk increases after age 40 • Risk factors • Personal Habits, Environmental factors, Occupational hazards

  12. Cancer Facts (Con’t) • Prob. of developing cancer in U.S. (from birth to age 74) • 40% Male/Female • Death of cancer victims • 50% of personnel who develop cancer will die • Overall death rate from cancer • 20%

  13. Cancers frequently linked to radiation Breast cancer Thyroid cancer Leukemia

  14. Radiation Risk Estimate • Relative-Risk Coefficient - The fractional increase in the baseline incidence or mortality rate for unit dose (4 x 10-4 ) • If 10,000 indiv. received one rem each over background during their life, 4 additional deaths would occur of the 2,000 that would naturally occur

  15. Is Radiation Safe? • Safer than normal risk associated with many activities encountered daily

  16. Something Extra • Irradiating Food • Radon

  17. Summary • There may be a slight increase in the risk of developing cancer