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*To*: radsafe@romulus.ehs.uiuc.edu*Subject*: Re[2]: When does "rem" no longer apply?*From*: Dan Burnfield <DANB@DNFSB.GOV>*Date*: Wed, 01 Apr 1998 10:38:22 -0500

I guess the best way to look at this issue is to try and determine what question you want to answer. If you are looking for acute (deterministic or non-stochastic) effects then you should use units of absorbed dose (i.e., rad or Gray) and if you are looking for stochastic effects then the units of equivalent dose (i.e., rem or Sievert). If the question concerns posting then you have some leeway at least in DOE. I would say that if one could make the decision to change the posting from rem to rad at levels between 20 rad per hour to 100 rad per hour. Clearly at 500rad per hour the units shopuld be posted in rad per 10 CFR 835. Dan Burnfield danb@dnfsb.gov

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