Computer Science
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44.1091t&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 44, Issue 8, pp.1091-1097
Computer Science
1
Scientific paper
The concentrations of 238 Pu, 239 + 240 Pu, 241 Am and 137 Cs were determined in rain samples collected at Monaco in the course of 1978-1979. Based on these data, the annual deliveries of these radionuclides to the Mediterranean by rain are computed to be 0.18 ± 0.01 pCi m -2 for 238 Pu, 8.1 ± 0.1 pCi m -2 for 239 + 240 Pu, 0.58 ± 0.02 pCi m -2 for 241 Am and 351 ± 4 pCi m -2 for 137 Cs. Comparing the delivery data with the mixed layer inventories of 239 + 240 Pu and 241 Am in the Mediterranean, the upper limits of the mean residence time of these radionuclides in the mixed layer were estimated to be 12.3 yr for 239 + 240 pu and 2.9 yr for 241 Am. These values are consistent with the conclusion deduced from the vertical distribution pattern of these transuranic elements in the Mediterranean. Based on delivery values, the annual activity ratios for 238 pu / 239 + 240 Pu , 241 Am / 239 + 240 Pu and 239 + 240 pu / 137 Cs are found to be 0,022, 0.072 and 0.023 respectively. The 238 pu / 239 + 240 pu and 239 + 240 Pu / 137 Cs activity ratios vary within relatively narrow ranges with time, while a much wider variation was observed for the 241 Am / 239 + 240 Pu activity ratio. The cause of the wider variation of the 241 Am / 239 + 240 Pu ratio may be related to the difference in the mean age of fallout brought down in different seasons.
Ballestra S.
Fukai R.
Thein Myint
Yamato A.
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