Safety_Series_041_1975 - gnssn - International Atomic Energy ...

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APPENDIX IV 77
FIG . 6. DWL values f o r 60Co and 137 Cs in the ca se o f aqueous re le a se .
in 4.1, so that one set can be read every quarter and one every year.
It is also recommended to take measurements once a week with a
portable scintillometer (scale in fJR/h).
Samples of milk should be taken every month at four positions
for determining I, and every quarter for other nuclides. Fallout
samplers should be positioned at the air-sampling points;
samples should be taken corresponding to periods of one month.
Once a year a soil sample should be analysed (the top 5 cm) to
measure the accumulated deposition. Weekly samples of river
water should be taken about 100 m downstream from the discharge
pipe.
Every quarter sediment samples should also be taken in the
water sampling zone. In.addition, measurements should be made
with a scintillometer (graduated in /uR/h) once a month along the
bank (several hundred m) and at the Club de Pesca.
From time to time samples should also be taken from grown
plants and pasture land up to a distance of 3 km from the power
station, and fish samples should be taken at Zarate.
The analytical results obtained (for the nuclides included in
Figs 5 and 6) should be compared with the corresponding DWL
values and the value f = measured value/DWL should be recorded.
If this fraction is more than 10%, the sampling should be.repeated
and if the result is confirmed, the release records should be
examined. If f is close to unity, the waste processing procedures
should be re-examined or the release limits reset.