@article{oai:repo.qst.go.jp:00043553,
 author = {M., Abdul Malek and Nakahara, Motokazu and Nakamura, Ryouichi and 中原 元和 and 中村 良一},
 journal = {Journal of Environmental Radioactivity},
 month = {},
 note = {The work describes the uptake, retention/biological elimination and organ/tissue distribution of 137-Cs by freshwater Japanese catfish (Silurus asotus Linnaeus) under laboratory conditions. The fish were divided into three groups based on their size and age and reared in 137-Cs-spiked water. The concentration of 137-Cs in the whole body of the live fish was measured at regular intervals up to 60 days. A significant accumulation of 137-Cs was found, but a steady state condition was not achieved by the end of the experiment. The bioaccumulation factors at steady state and the required time to reach steady state were estimated to be 1.55 and 255 days, 1.76 and
180 days and 1.99 and 160 days for large, medium and small size fish, respectively.
To determine the effective half-life of 137-Cs, the fish were transferred and reared 
in the non-contaminated host water. The concentration of the remaining 137-Cs in the
whole body of the live fish was measured up to 66 days. The average effective half-
life of 137-Cs in the fish species was found to be ~142 days for fish of all sizes.
The distribution of 137-Cs in different organs/tissues of the fish was determined.
Accumulation of 137-Cs in muscle/flesh of the fish was found to be ~75% of whole 
body accumulation. The uptake rate and the retention capability of juvenile fish were
found to be higher and therefore, these were more susceptible to 137-Cs than adult and
old fish, and could be an important source of 137-Cs in the human food chain.},
 pages = {191--204},
 title = {Uptake, retention and organ/tissue distribution of 137Cs by Japanese catfish (Silurus asotus Linnaeus)},
 volume = {77},
 year = {2004}
}