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James A. Van Allen lab journal, March 1958-September 1959

Page 208

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Cobalt 60 Source Calibration (the one I used for calibration of Pioneer IV Payload -- which belongs to the Radiation Research Laboratory) by Bureau of Standards: Test Number G-25280-1 March 23, 1959 NBS Number: 44518 Maker Number: 111 Milliroentgens per hour at one meter: 0.73 Made on 16 March 1959) ( +- 3% ) -
 
Van Allen Papers