Abstract
This work is a test for the application of radioactive survey to geological survey in field. This survey is applied to the contact metamorphic rocks which occured by the granite intrusion into the paleozoic formation in Onnagawa district of northern part of Niigata Prefecture. The radioactivity of this metamorphic rocks are determined by the contents of potash feldspar in the rocks. Potash feldspar occurs in nearest part from granite intrusion, which are most strongly metamorphosed.
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