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James A. Van Allen journal, October 1955-March 1958
Page 30
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is read by the electrostatic voltmeter. Kasper found something like this [graph/sketch/picture] graph of [R sub 0 ?] [shielded to unshielded corrected to] S/U G.M. counter versus Kv (r.m.s.) about 3/1 rising to ~15/1 as the voltage decreases from 80 to 50 Kv (r.m.s.) (By memory, ratios may be a bit off) Then, today with crystal channel in operation, clearly demonstrated the pile up with X-rays of (~60 [kev r.m.s. on tests). The pile up effect is _very_ sensitive to voltage on X-ray tube. Proved to be a valid effect by placing absorbers in front
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is read by the electrostatic voltmeter. Kasper found something like this [graph/sketch/picture] graph of [R sub 0 ?] [shielded to unshielded corrected to] S/U G.M. counter versus Kv (r.m.s.) about 3/1 rising to ~15/1 as the voltage decreases from 80 to 50 Kv (r.m.s.) (By memory, ratios may be a bit off) Then, today with crystal channel in operation, clearly demonstrated the pile up with X-rays of (~60 [kev r.m.s. on tests). The pile up effect is _very_ sensitive to voltage on X-ray tube. Proved to be a valid effect by placing absorbers in front
Van Allen Papers
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