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APPENDIX III 57
EXAMPLES OF REPORTED DOSE ESTIMATES
India
Estimated doses that might be received by persons in the neighbourhood
of the Tarapur reactors [16]
(a)
Dose due to dietary intake
Dose to the public due to the dietary intake is calculated as per
the method adopted at Hanford. This is based on the dose factors
calculated from ICRP standard man's maximum perm issible intake
(MPI) value for the particular nuclide and corresponding annual dose.
MPI is calculated from maximum perm issible concentration in
water MPCWand water intake values. The perm issible annual dose
taken is 0.5 rem /a for whole body and 3.0 rem /a for thyroid and bone
as the critical organs. The dose factors mrem/MCi intake are
given for the nuclides of interest in the present evaluation in Table VII.
From these dose factors and the intake data the dose due to the
radioactivity intake is evaluated. It has been seen that in seafood
samples 134C s /137Cs ratio is about 0:65 and 90S r /89Sr is 0.1 and these
ratios are used for evaluating dose from radiocaesium and radiostrontium.
These doses evaluated |for the critical group (fishermen)
for 1970 and 1971 are given in Table VIII.
The dose factors in Table VII and doses in Table VIII are
evaluated on the ICRP basis. As can be seen in the next section,
the stable element intake at Tarapur is different from the ICRP
TABLE VII.
RADIATION DOSE FACTORS
N uclides C r itic a l organ Dose fa cto r
(m re m /(iC i in ta k e)
Io d in e -131 Thyroid 1 8 6 0 .0 0 .
C a e siu m -134 W hole body 6 9 .0 0
C a e s iu m -137 W hole body 3 1 2 .0 0
S tro n tiu m -89 Bone 3 7 4 .0 0
S tro n tiu m -90 Bone 37 4 0 0 .0 0
C o b a lt-60 W hole body 6 .2 3