Measurements of Cesium-137 in Rain Water with a Scintillation Spectrometer

Abstract

Measurements of Cesium-137 content in rain water in Yamagata have been made in 1958 by gamma scintillation spectroscopy.
The average monthly quantity of Cesium-137 in rain water in 1958 was estimated as 0.99 me/km² per month while it was 0.3 mc/km² per month in 1957.
Despite the amount of precipitation in 1958 was 1.7 times that of precipitation in 1957, the content of Cesium-137 increased more than 3 times during the same period.