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Report No.

Study on transport of radionuclides in watershed environment

Nakanishi, Takahiro  ; Tsuruta, Tadahiko ; Funaki, Hironori ; Sakuma, Kazuyuki  ; Miura, Tomisato*; Yoshida, Mitsuaki*

To elucidate the mechanism of transport of dissolved radiocesium to masu trout, a feeding experiment was conducted in a culture pond introduced with mountain stream water (dissolved $$^{137}$$Cs concentration: 0.1 - 0.2 Bq/L) using a non-contaminated bait. The $$^{137}$$Cs concentration in the muscle of the adult masu trout (n = 10) was relatively high, showing individual differences (30 - 200 Bq/kg-wet). Pond bottom gravel was found in their stomach, suggesting a source of $$^{137}$$Cs other than bait and stream water. As a result of dietary analysis using stable isotope ratios, the contribution of aquatic organisms was higher in masu trout with higher $$^{137}$$Cs concentration in the muscle. This suggests that the $$^{137}$$Cs concentration in masu trout does not exceed the Japanese limit of 100 Bq/kg for general foodstuffs by transport only from the dissolved $$^{137}$$Cs.



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