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Abstract

Until now, the transuranic elements have only received scattered attention regarding their behaviour in fresh waters. Nevertheless, an understanding of their biogeochemistry in such media is required to develop a realistic assessment of the critical pathways leading to man. To evaluate the importance of the different routes, information is needed on the biokinetics of these radionuclides in selected biota and on the parameters which govern their accumulation. Therefore, an attempt was made to elucidate the effect of one of these parameters, namely water acidity, on the bioavailability of the transuranic 241-Am for the pond snail Lymnaea stagnalis L. Published data have already indicated that the pH of the external medium does not greatly alter the 241-Am uptake by L. stagnalis during winter (Th80). However, it has been demonstrated that the fixation of the radionuclide in this laboratory bred species undergoes seasonal changes, attaining a maximum in summer and a minimum in winter (Th82). In a final experiment both effects were combined, the influence of water acidity being studied during 2 different seasons, i.e. summer and winter.

Additional information

Authors: THIELS G M, JRC ISPRA ESTAB. (ITALY);S.C.K./C.E.N., MOL (BELGIUM);MURRAY C N, JRC ISPRA ESTAB. (ITALY);S.C.K./C.E.N., MOL (BELGIUM);VANDERBORGHT O L J JRC ISPRA ESTAB. (ITALY), JRC ISPRA ESTAB. (ITALY);S.C.K./C.E.N., MOL (BELGIUM);S.C.K./C.E.N., MOL (BELGIUM), JRC ISPRA ESTAB. (ITALY);S.C.K./C.E.N., MOL (BELGIUM)
Bibliographic Reference: HEALTH PHYSICS, VOL. 47 (1984), NO. 3, PP. 485-487
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