Volume 37, Numéro C1, February 2002ECORAD 2001: The Radioecology - Ecotoxicology of Continental and Estuatine Environments
|Page(s)||C1-385 - C1-390|
|Publié en ligne||14 octobre 2009|
Parameters of bank vole decontamination from radiocesium and radiostrontium
International Radioecology Laboratory, Slavutych Division of International Chornobyl Center, P.B. 151, Slavutych, Kievskaya Oblast 07100, Ukraine
2 Department of Biological Sciences, Texas Tech University, Lubbock, Texas 79409-3131, U.S.A.
13 voles in 2000 and 15 in 2001 were moved from the most contaminated area of Chornobyl Zone to lab and fed by "clean" food over 2 months. Application of specially designed beta-gamma spectrometer and live counting methods allowed describing whole body decontamination. Initial whole body activity ranged : 22-385 kBq 137Cs and 0.9-7.7 kBq 90Sr. Less 0.4 % activity was lost by physical decay during the study, the most - by biological excretion way. In the 2000 study 97.4 % 137Cs activity was excreted with half-life period of 1.93d, and in the 2001 study - 99.3% and 2.18d, respectively. 43 % 90Sr activity contents was excreted with half-life of 13.7d in the 2000 study and 59 % with 13.1d in the 2001 study, respectively. The rest amount of the radionuclides was considered as non-excreted over the study term. At that, 90Sr and 137Cs loss rate of males was higher than females, and, paradoxically, lactating females over suckling period had more slow reduction both radionuclides, than other females. At birth 137Cs content in newborns was 2-10.5 % of their mother activity, and 0.15-1.12 % of mother's 90Sr content. Over the first 4-8 days of life (the period of exclusive milk consumption), substantial growth of 137Cs activity took place, reaching a maximum value of 30-40% of their initial activity. The 90Sr activity in newborns continued to grow over the suckling period, even with the steady decrease of 90Sr activity in mother's body. By the end of the suckling period (15-18 days), total 90Sr activity in a litter increased and attained an average of 3-4 times their initial value.
© EDP Sciences, 2002
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