Strontium-90 and cesium-137 in service water; October, 1977 to March, 1978

The samples of rain and dry fallout, air-borne dust, service water and fresh water, soil, sea water, sea sediment, total diet, rice, milk, vegetables, tea, fish, shellfishes and seaweed, and fresh water fishes, their sampling and prior treatment are described. The methods of separating Sr-90 and Cs-137 and their measurement are explained. The estimations of stable Sr, K and Ca are made by atomic absorption spectroscopy, flame spectrophotometry and potassium permanganate titration, respectively. The general plan of radioactivity survey in Japan is shown. As the environmental data, the results of Sr-90 and Cs-137 in source water and tap water obtained from October, 1977, to March, 1978, and the locations of sampling are given. In a table, the months and the locations of sampling, pH, and the amounts of Sr-90 and Cs-137 (pCi/l) are shown. The maximum values are 0.33 pCi/l of Sr-90 found in Kyoto in February, 1978, and 0.02 pCi/l of Cs-137 found in Katsushika, Tokyo, and Inuyama, Aichi Prefecture, in December, 1977, in sourve water. In tap water, 0.35 pCi/l of Sr-90 was found in Kyoto in February, 1978, and 0.02 pCi/l of Cs-137 in Sapporo and Akita in december, 1977. (Kako, I.)