Safety_Series_041_1975 - gnssn - International Atomic Energy ...

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5 8 A PPENDIX III
TABLE VIII. DOSE TO FISHERMAN FROM DIETARY INTAKE
OF CRITICAL NUCLIDES
N uclides
C ritic a l organ
Dose during 1970
(m rem )
Dose during 1971
(m rem )
Io d in e -131 Thyroid 7 . 8 47
C a e siu m -134 W hole body 0 .0 5 3 0 .6 9
C a e siu m -137 W hole body 0 .3 6 4 . 8
S tro n tiu m -89 Bone 0 .1 2 0 .3 5
Strontium - 90 Bone 1 .2 3 .4
C o b a lt-60 W hole body - 0 .0 0 1
Dose values have a 25% standard error.
value. The body weight of Indian standard man and water intake data
are also different from those of ICRP. Thus dose given in Table VIII
will be slightly different when these factors are considered.
It can be seen from Table IX that direct dose due to airborne
releases from the power station was only 5 to 7 mR during 1971
and below detection during 1970. This was observed in only two
villages and during the two months of June and July 1971. The dose
received by the critical population group due to contaminated seafood
is from the intake throughout the year and not over a small interval.
Even though the dose due to fission gases could not be detected in
the environment, the dose due to eating contaminated seafood, though
very low, could be measured. In the Tarapur Environment the
liquid radwaste - sea - seafood - man chain is the important exposure
pathway for evaluation of population exposure from operation of the
atomic power station.
The critical pathway and critical population group in the case
of accidental release may be different from the normally observed
findings. Under accident conditions 131I release to atmosphere
is prim arily expected and the critical food is then leafy vegetables
and milk. The population group consuming the highest amount of
milk and leafy vegetables would then become the m ost highly exposed
group. In the event of an accidental release to the marine environment
the critical pathway sea - seafood - man observed during
normal operation would still apply.