Table 1: Concentrations of 137Cs and dissolved and particulate 239,240Pu in Japanese river water.
Uncertainty is one sigma of counting error.
a: from Miyake et al., 1973; b: from Hirose and Sugimura, 1981; c: unpublished data; d: from Hirose et al., 1990
Name of river | Sampling time | 239,240Pu (mBq m–3) | Dissolved 137Cs (Bq m–3) |
Dissolved | Particulate |
Kitakami | Aug. 1966 | 25±3 a | 21±2 a | |
Mogami | Aug. 1966 | 67±4 a | 21±2 a | |
Shinano | Oct. 1966 | 8.5±0.7 a | 14±1 a | |
Kiso | Oct. 1966 | 19±2 a | 11±1 a | |
Tone | Nov. 1966 | 154±7 a | 7.8±0.7 a | |
Yodo | Aug. 1967 | 2.6±0.4 a | 4.8±0.4 a | |
Asahi | Aug. 1967 | 9.6±0.7 a | 8.5±0.7 a | |
Yoshino | Aug. 1967 | 19±2 a | 12±1 a | |
Ishikari | Oct. 1978 | 10±1 b | 5.2±0.4 b | 0.65±010 c |
Kitakami | Oct. 1978 | 3.3±0.4 b | 5.6±0.4 b | 1.27±0.18 c |
Mogami | Oct. 1978 | 11±1 b | 1.5±0.2 b | 2.15±0.30 c |
Shinano | Oct. 1978 | 1.9±0.4 b | 1.1±0.1 b | 1.56±0.10 c |
Kiso | Oct. 1978 | 10±1 b | 5.9±0.4 b | 0.58±0.09 c |
Yodo | Oct. 1979 | 0.7±0.4 b | 3.0±0.4 b | 1.37±0.20 c |
Yoshino | Oct. 1979 | 1.1±0.4 b | 4.8±0.4 b | 0.28±0.06 c |
Asahi | Oct. 1979 | 0.4±0.2 b | 0.37±0.04 b | 0.99±0.15 c |
Chikugo | Oct. 1979 | 31±2 b | 1.9±0.1 b | 0.94±0.14 c |
Tone | Feb. 1980 | 58±4 b | 1.9±0.1 b | 0.59±0.10 c |
Ohono | Oct. 1980 | 0.6±0.1 c | 0.7±0.07 c | 0.30±0.06 c |
Hii | Sep. 1981 | ND | 4.8±0.4 c | 0.31±0.06 c |
Gou | Sep. 1981 | 0.7±0.1 c | 0.85±0.07 c | 0.21±0.05 c |
Ohota | Sep. 1981 | 0.4±0.1 c | 1.0±0.1 c | 0.33±0.06 c |
Shinano | Oct. 1982 | 0.4±0.1 c | 3.0±0.4 c | 0.14±0.04 c |
Omono | Oct. 1982 | 0.9±0.1 c | 2.7±0.3 c | 0.23±0.05 c |
Mogami | Oct. 1982 | 2.8±0.3 c | 2.4±0.2 c | 0.27±0.06 c |
Kiso | Oct. 1983 | 11±1 c | 1.1±0.1 c | 0.11±0.03 c |
Fuji | Oct. 1983 | 1.1±0.1 c | 0.3±0.04 c | 0.03±0.02 c |
Tenryu | Oct. 1983 | 1.1±0.1 c | 0.52±0.07 c | 0.18±0.04 c |
Fuji | Oct. 1984 | 0.21±0.05 c | 0.48±0.07 c | 0.06±0.02 c |
Tenryu | Oct. 1984 | 0.4±0.04 c | 0.7±0.1 c | 0.07±0.03 c |
Yura | Oct. 1984 | 0.5±0.07 c | 0.9±0.1 c | 0.01±0.02 c |
Kiso | Oct. 1984 | 0.37±0.04 c | 1.0±0.1 c | 0.14±0.04 c |
Tone | June 1985 | 2.2±0.3 d | 0.67±0.13 d | 0.69±0.10 d |
Ishikari | Oct. 1985 | 0.33±0.07 d | 1.6±0.3 d | 0.033±0.018 d |
Kitakami | Oct. 1985 | – | 0.63±0.14 d | 0.085±0.03 d |
Tone | Nov. 1985 | 0.08±0.03 d | 0.56±0.10 d | 0.126±0.038 d |
Tone | Feb. 1986 | 1.51±0.26 d | 0.52±0.10 d | 0.39±0.08 d |
Tone | June 1986 | 0.3±0.07 d | 1.63±0.22 d | 1.39±0.10 d |
Ishikari | Aug. 1986 | – | 0.52±0.10 d | 0.57±0.10 d |
Kuzuryu | Oct. 1986 | – | 0.67±0.12 d | 1.04±0.10 d |
Kiso | Nov. 1986 | 0.11±0.03 d | 0.52±0.10 d | 0.49±0.09 d |
Tenryu | Nov. 1986 | – | 0.37±0.07 d | 0.14±0.05 d |
Fuji | Nov. 1986 | 0.59±0.1 d | 0.22±0.06 d | 0.063±0.029 d |
Tone | Oct. 1986 | 0.04±0.01 d | 0.52±0.09 d | 0.46±0.06 d |
Tone | Feb. 1987 | 0.06±0.02 d | 1.30±0.21 d | 0.52±0.10 d |
Kiso | Oct. 1987 | – | – | 0.25±0.05 c |
Tenryu | Oct. 1987 | – | – | 0.05±0.03 c |
Fuji | Oct. 1987 | – | – | 0.05±0.03 c |
Ishikari | Oct. 1987 | – | – | 0.11±0.04 c |
Teshio | Oct. 1987 | – | – | 0.19±0.04 c |
Kitakami | Oct. 1987 | – | – | 0.29±0.06 c |
Tone | Oct. 1987 | – | – | 0.27±0.06 c |