Distribution of 137Cs around Kashiwazaki-Kariwa area

Cesium-137 distribution in several rivers, lakes and their sediments was investigated with HPGe detectors to elucidate the source of this isotope in some fresh waters from Kashiwazaki-Kariwa area, Niigata, Japan. It was suggested that there exists a place abundant in fallout radionuclides in the east side of a mountain which is located by the coast. Great westerly monsoon will contribute significantly to this phenomenon, which seems to be characteristic of mountains along the Sea of Japan.