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James A. Van Allen journal, October 1955-March 1958
Page 147
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A special virtue of these crystals is the fact that they can be exposed bare to the atmosphere, though they are, of course photo-sensitive and must be shielded from light. He is considering them for the direct detection of the auroral particles. Has observed as high as 1000/1 signal/noise ratio for Po alpha's. More typically 100/1. Get ~ 0.2 volt signal. Therefore Noise level may be as low as ~5 kilovolts ! Can be obtained in only quite small sizes (~ 2mm square) but such a size is quite adequate for the purpose ((~10 exponent 7) / (cm exponent 2)( second))
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A special virtue of these crystals is the fact that they can be exposed bare to the atmosphere, though they are, of course photo-sensitive and must be shielded from light. He is considering them for the direct detection of the auroral particles. Has observed as high as 1000/1 signal/noise ratio for Po alpha's. More typically 100/1. Get ~ 0.2 volt signal. Therefore Noise level may be as low as ~5 kilovolts ! Can be obtained in only quite small sizes (~ 2mm square) but such a size is quite adequate for the purpose ((~10 exponent 7) / (cm exponent 2)( second))
Van Allen Papers
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