When does "rem" no longer apply? -Reply

[FRAMEP@ORAU.GOV]

ICRP 60 p114

"The quality factor is applicable only for stochastic effects in the dose
range up to tens of mGy."

ICRU 51 p6

"The quantity dose equivalent is defined for routine radiation-protection
applications. It should not be used in numerical assessment of high level
exposures, for example in radiation accidents."

NCRP 91 p 11

regarding the quality factor Q  "it is applicable at low doses for the
biological effects of primary concern i.e. cancer induction and severe
genetic defects. Q is only to be used at low absorbed doses in the range
of the annual radiation protection limits and not for the high doses that
might occur in accident situations."

In other words, there is no clear answer.  

Paul Frame
Professional Training Programs
ORISE
framep@orau.gov