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This publication is no longer valid Please see http://www.ns-iaea.org/standards/ 4 8 APPENDIX II vicinity of TAPS site have been constantly measured with therm o luminescent dosim eters (TLD) installed at village centres in different directions from the site. The dosim eters were charged once in 3 months and annual dose was evaluated by summing up the quarterly doses. The dose during 1968, 1969 and 1970 is in the natural background radiation level. Only during 1971 Akkarpatti village, which is about 1.8 km south of site, had about 7 mR and Ghivali village, which is 1.8 km north of site, had about 5 mR dose higher than normal background radiation. This higher than background dose during 1971 was seen during the month of June-July 1971 and at the same time power station stack releases were going up frequently to 500-580 m C i/s. Daily intake through seafood and critical group of population It has been seen that except seafood no other dietary item can contribute significantly to the daily intake from radioactivity d ischarged from Tarapur Power Station under normal conditions. Thus it is sufficient to consider the daily intake of seafood by the different groups of population in the Tarapur environment to evaluate the intake of the critical nuclide. The seafood intake of the main group of Tarapur population is taken from the diet survey data. Using the average nuclide concentration in seafood during 1970 and 1971 from Tables III and IV, the daily intake of critical nuclides by the different groups of population has been evaluated. It has been found that on average only 75% of weight of fish is used in preparing food and 25% is discarded as non-edible. The data given in the present study concern the edible portion only. It is observed that fishermen in the TAPS environment, whose seafood intake is about 3 times higher than that of other groups, have the highest intake of TAPS-released radioactivity. Thus they are the critical group of population for TAPS discharges. UNITED KINGDOM Analysis of alternative hazard assessment approaches [17] The critical pathway approach The critical pathway approach has as its basis a hazard evaluation (Table V), which uses predicted concentrations in the receiving water mass resulting from unit rates of introduction of radionuclides.
This publication is no longer valid Please see http://www.ns-iaea.org/standards/ APPENDIX II 49 TABLE III. AMOUNT OF CRITICAL RADIONUCLIDES IN THE DIETARY MATERIALS IN THE TAPS SITE VICINITY DURING 1968-1971 M a in v a r ie tie s 89+90Sr i34+‘ 37C s 131j C o D ie t ite m an d y e a r o f p r o d u c tio n ( p C i /k g o f ite m ) 1 2 3 4 5 6 R ice 19 6 8 5 . 6 ± 3 . 0 2 7 .0 ± 4 . 8 BDL BDL 19 69 9 . 5 ± 3 . 8 2 8 .0 ± 5 . 8 BDL BDL 1970 1 0 .5 ± 4 . 0 2 6 .5 ± 3 . 5 BDL BDL 19 71 1 1 .8 ± 4 . 5 3 0 .5 ± 3 . 6 BDL BDL W h ea t 19 6 8 4 . 5 ± 3 . 6 3 8 .5 ± 4 . 6 BDL BDL 19 6 9 5 . 2 ± 3 . 4 4 4 . 5 ± 3 . 8 BDL BDL 19 70 5 . 8 ± 2 . 4 4 2 . 4 ± 3 . 5 BDL BDL 19 71 6 . 3 ± 1 . 8 4 0 . 9 ± 9 . 9 BDL BDL L ea fy 1 9 68 1 2 .6 3 ± 4 . 5 1 9 .0 2 ± 5 . 8 8 9 .2 ± 2 2 .5 BDL 19 69 8 . 6 4 ± 1 .6 1 6 .4 5 ± 3 . 5 BDL BDL 1970 7 . 5 6 ± 2 . 6 2 2 .8 ± 4 . 5 1 0 1 .5 ± 2 5 .5 BDL 19 71 8 . 3 ± 1 . 2 2 4 . 5 ± 9 . 9 1 5 0 .0 ± 3 1 .0 BDL V e g e ta b le s R oot and 19 6 8 4 . 3 0 ± 1 . 2 1 4 .3 ± 1 . 2 9 . 5 5 ± 2 . 2 BDL oth er 19 69 4 . 2 4 ± 1 .5 1 1 .5 ± 1 . 8 BDL BDL 19 70 6 . 5 6 ± 2 . 4 1 2 .8 ± 2 . 3 1 6 .5 ± 3 . 8 BDL 19 71 4 . 1 0 ± 1 .6 1 5 .3 5 ± 3 . 2 2 4 .6 ± 4 . 5 BDL 1 9 68 6 . 5 ± 1 .6 2 2 .4 ± 3 . 2 7 . 5 ± 1 .2 BDL 1969 8 . 8 ± 2 . 4 2 1 .3 ± 4 . 4 BDL BDL M ilk 1970 9 . 2 ± 2 . 2 2 6 .7 ± 3 . 5 1 4 .4 ± 3 . 5 BDL 1971 1 2 .2 ± 2 . 6 . 3 3 . 5 ± 4 . 5 2 2 .5 ± 4 . 8 BDL M u tton 19 68 8 . 4 ± 2 . 2 2 5 .2 ± 3 . 4 1 0 .3 ± 3 . 3 BDL (g o a t 1 9 69 7 . 6 ± 4 . 6 2 4 .5 ± 3 . 2 BDL BDL Fresh m e a t m e a t) 19 70 9 . 8 ± 2 . 4 2 8 .4 ± 3 . 6 1 5 .6 ± 2 . 8 BDL 19 71 1 2 .2 ± 2 . 6 3 3 .5 ± 4 . 5 3 1 .8 ± 3 . 8 BDL C o a s ta l 19 68 BDL 1 8 .5 ± 3 . 7 BDL BDL Fish and c a t c h 19 69 BDL 1 7 .7 ± 4 . 5 BDL BDL se a fo o d 19 70 7 . 6 ± 2 . 2 3 9 .0 ± 2 6 .2 8 4 .9 ± 3 2 .2 . N e g lig ib le 19 71 2 0 .6 7 ± 3 . 8 5 1 2 .1 ± 1 2 9 .5 5 0 8 .6 4 ± 2 4 2 .2 4 . 8 6 ± 2 . 9 BDL■= B elow d e t e c t io n l im it for 1 k g s a m p le .
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