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Absorption coefficients for gamma-radiation ranging from 0.32 to 2.8 Mev penetrating various elements ranging from low to high Z were measured. A geometry was employed which yielded results whose accuracy was limited only by statistics and background corrections. The source, absorbers of area just sufficient to completely intercept all detected gamma-rays, and a Geiger tube were suspended outdoors about 25 feet above the ground. The results are in excellent agreement with theoretical predictions.
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C.L. Cowan (1948) studied this question.
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