Relation to Diffusion Measurements of Some Beta-Ray Absorption Phenomena

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Abstract
The absorption in thin layers of nickel, aluminum, and cobalt of beta rays from Co60 was measured in connection with the use of the surface counting method of determining diffusion coefficients. Data was obtained for foils and for evaporated and electroplated layers. In all cases the activity increased between 0 and 4 mg/cm2. A discrepancy was noted between the data for foils and those for evaporated and electroplated layers. It is shown that this general behavior is predicted by simple scattering and absorption expressions. The implications of these data for the use of the surface counting method are discussed.

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