NCRP Report #147 - Radiation Shielding for Medical Instalations
NCRP Report #147 - Radiation Shielding for Medical Instalations
NCRP Report #147 - Radiation Shielding for Medical Instalations
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<strong>NCRP</strong> <strong>Report</strong> <strong>#147</strong> Conclusions I• Design goals, P:– Kerma in Controlled areas = 5 mGy y -1– Kerma in Uncontrolled areas = 1 mGy y -1• Will assure general population dose limit of 0.25 mSv y -1 isn’tviolated• Reasonable occupancy factors, T:– <strong>for</strong> individuals in uncontrolled areas– effect is to increase kerma to P/T• Transmission, B, is ratio of kermas with andwithout shielding– fit to Archer equation– “hard” HVL results from beam hardening45
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