Abstract
Methodology is discussed for detecting and evaluating low levels of radioactivity of rocks, as measured by alpha particle emission. Applications are made to the radioactivity of samples of black shale, which range in activity from 0.94 to 8.96 alpha particles per minute per 1.5‐inch diameter circular surface of powdered material. A two factor analysis of variance design with multiple cell entries is used to test for homogeneity of means within a small sampling grid in black shale. Plans to extend this method to a study of regional radioactive variation within a stratigraphic unit are also discussed.
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