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James A. Van Allen lab journal, March 1958-September 1959
Page 115
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lower energy electrons (A.E.C.) entering through the aperture! Had also agreed to use a considerably thicker shield of Pb over the shielded G.M. tube to get a further test of hardness (~3/16 inch Pb)
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lower energy electrons (A.E.C.) entering through the aperture! Had also agreed to use a considerably thicker shield of Pb over the shielded G.M. tube to get a further test of hardness (~3/16 inch Pb)
Van Allen Papers
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