-19-
at the level of the RPG is considered as an acceptable risk for a
lifetime.
The RPG's for the population are expressed in terms of
annual exposure except for the gonads where the ICRP recommended
value of 5 rems in 30 years is used.
FRC states that the operational
mechanism described for application of criteria to limit the whole
body dose for individuals to 0.5 rem per year and to limit exposure of
a suitable sample of the population to 0.17 rem per year is likely to
assure that the gonadal exposure guide will not be exceeded.
Environmental radiation monitoring is a necessary part of complying
with the RPG guidance.
The intensity and frequency of measurements
is to be determined by the need to be able to detect sharply rising
trends and to provide prompt and reliable information on the effectiveness of control actions.
Radioactive source control actions and
monitoring efforts are to increase as predicted exposures move upward
through a range of values and approach the numerical value of the RPG.
A sharply rising trend approaching the RPG would suggest strong and
prompt action.
The magnitude of the action should be related to the
degree of likelihood that the RPG would be exceeded.
The child, infant, and unborn infant are identified as being more
sensitive to radiation than the adult.
Exposures to be compared with
the guidance are to be derived for the most sensitive members in the
population.
The guide for the individual applies when individual
exposures are known; otherwise, the guide for a suitable sample
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