Table 2: Concentration ranges and calculated values of 239,240Pu and 137Cs dissolved in Japanese river water.
* The effect of the Chernobyl fallout was removed from this calculation.
Year 239,240Pu range Calc. 137Cs range Calc.
mBq m–3 Bq m–3
1966 8.5–154 30
1967 2.6–19 13
1978 1.9–11 5.4 0.6–2.2 0.78
1979 0.4–30 2.2 0.3–1.4 0.36
1980 0.8–58 0.8 0.07–0.59 0.22
1981 0.04–1.3 4.9 0.11–0.33 0.51
1982 0.4–2.8 1.0 0.14–0.27 0.18
1983 1.1–11 0.54 0.03–0.18 0.15
1984 0.06–0.48 0.52 0.015–0.21 0.14
1985 0.33–0.67 0.34 0.03–0.69 0.12
1986 0.04–1.5 0.35 0.06–1.4 0.10*
1987 0.05–0.52 0.12