Abstract
In succession of the previous report (1), the measurements of strontium-90 (Sr-90), cesium-137 (Cs-137) and iodine-131 (I-131) concentrations in milk were carried out in order to evaluate the range of the radioactive contamination of milk in Japan since 1961. Farm milks collected from various districts of Japan monthly from 1961 to 1963 were used for radioactivity assay. The results of observation show the Sr-90 concentration in milk is higher than that in the previous years (1957-1960) all over the country and there is regional variation in Sr-90 and Cs-137 concentrations.
