Safety_Series_041_1975 - gnssn - International Atomic Energy ...

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70 APPENDIX III
The maximum permissible rate of intake (MPRI) of boneseekers
for individuals was taken as one-tenth the product of the
maximum permissible concentration (MPC) in water for a given
radionuclide, as recommended by the ICRP for continuous occupational
exposure, and the rate of water intake as given by the ICRP
for the standard man (2.2 litres/d). In the case of 32P the MPRI
is 16 mCi/a for the Maximum Individual. The MPRI for an average
of the exposed population (the Typical Richland Resident) was taken
to be one-third of the MPRI for individuals, of 5.3 /uCi/a for 32P.
Computation of the dose received by the thyroid gland was
related to FRC intake guides recommended for 131I. The top of
Range II (100 pCi/d) was rounded off by the FRC from approximately
80 pCi/d, which if sustained over a one-year period, would result
in a dose of approximately 500 mrem to a 2 g thyroid based upon
current ICRP dose calculation factors. Using 80 pCi/d (0.029 /iCi/a)
intake of 131I as a basis, the corresponding intake-dose factor was
calculated to be 17 000 mrem per /uCi 131I ingested.
T able X IV summarizes the factors used in calculating radiation
doses from environmental sources. Figures 1 and 2 show the
composite radiation doses for the average Richland resident and the
M axim um Individual for 196 9, as given in the annual environm ental
reports.