“…The presence of 90 Sr in Japan was mainly derived from nuclear weapons tests from the 1950s to 1980s (Hirose et al, 1987). Several researchers have previously reported that the fate of 137 Cs in the environment follows the transfer and distribution of stable Cs (Tsukada et al, 1998;Tsukada and Nakamura, 1999;Ru¨hm et al, 1999;Bunzl et al, 1999;Tsukada et al, 2002a, b;Tsukada and Hasegawa, 2002;Tsukada et al, 2003), therefore, the behavior of stable Sr in the environment should be regarded as a useful analogue in predicting the long-term fate of 90 Sr.…”