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14 - Radiation Safety and Protection

14 - Radiation Safety and Protection - Lecture 14(Ch 16...

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1 Radiation Safety and Protection Tarun K. Podder, PhD, DABR Department of Radiation Oncology Brody School of Medicine Leo Jenkins Cancer Center East Carolina University March 01, 2011 Lecture # 14 (Ch. 16)
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2 Curve a: superlinearity theory of radiation damage (not strongly supported by experiments). Curve b: linear hypothesis of radiation injury ; applied to estimate radiation risks and to establish standard for radiation protection. Curve c : threshold model of radiation injury ; damage may remain at zero for dose rates below some threshold level – biological repair. Curve d: radiation hormesis ; suggests low dose rates are beneficial; supported by experiments, but controversial.
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3 Within the area of uncertainty, which model is the best – inadequate data to identify Radiation protection Shielding Remote control techniques Monitoring procedures Personnel restrictions Radiation protection cost must be balanced against uncertain biological effects Exposure should be As Low As Reasonably Achievable (ALARA) consistent with reasonable cost and convenience and without compromising the benefits of radiation to society.
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4 Risk Levels NIRL – Negligible Individual Risk Level is defined as “ a level of average annual excess risk of fatal health effects attributable to irradiation, below which further effort to reduce radiation exposure to the individual is unwarranted.” Annual NIRL is 10 -7 , corresponding to a dose equivalent of 0.01 mSv; corresponds to a lifetime (70 yrs) risk of 0.7x10
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14 - Radiation Safety and Protection - Lecture 14(Ch 16...

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