Safety_Series_041_1975 - gnssn - International Atomic Energy ...

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This publication is no longer valid Please see http://www.ns-iaea.org/standards/ 76 APPENDIX I V AIR 90 Ṡr 1.1 X 10K C i/ m 3 137Cs 1.4 x id 13 Ci/m3 131 | 1.2 x ifl12 Ci/m 3 106Ru 1.7x 10'3 C i/ m 3 3h 1.6 x 107 Ci/m3 N O BLE G A S E S 1.5 xlO1 (C i-M e V / m 3)(7 ) D EPO SITIO N RATE (C i/m 2-d ) 90Sr 2.9 x10'12 137Cs 3.6 x io " 1311 3.1 1010 106 Ru 4.4
This publication is no longer valid Please see http://www.ns-iaea.org/standards/ APPENDIX IV 77 FIG . 6.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.
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