The lonization of the Air due to Beta- and Gamma-Radiations near the Ground (II)

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The results of the measurements of ionization due to the beta- and gamma-radiations near the ground surface from 1967 through 1969 are reported, and are discussed comparing with those obtained from 1963 through 1966. The ionization due to the beta-radiation decreased gradually, and the mean value for this period is about 1 J at one meter above the ground surface, and that by the gamma-radiation (including the cosmic rays) is almost constant,i.e., 5-6 J. In January 1967, sudden increase of the ionization due to the fallout radioactivity caused by the 5th Chinese nuclear explosion test was observed. ^<137>Cs, ^<90>Sr+^<90>Y, ^<106>Ru, and ^<144>Ce were detected from the grass and soil samples taken on the campus of this university in 1964. ^<144>Ce, ^<140>La, ^<95>Zr, ^<132>I, and ^<132>Te were also detected from the fallout particles caused by the 3rd Chinese nuclear explosion test on May 9, 1966.
日本放射線影響学会の論文