Introduction. Most irradiators use 137Cs or 60CoDesign to provide large doses and a uniform gamma fieldExternal hazard. Dose Rates Associated. Gamma onlyInternal - krad/hr External - >2.5mrem/hrWhy?2.5mR/hr X 40 hr/wk X 50 wks/yr = 5000 mrem/yrDesign dose rates exceeded - alarms. 2.5mR/hr.
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