Abstract
THE counter used in this investigation contained an anthracene phosphor (from Harshaw Chemical Co.) 2 cm. × 3 cm. × 3 cm. between two photo-multiplier tubes (R.C.A.5819). The pulses from the multipliers were amplified about 200 times and led to a coincidence stage of a type described by Morton and Sherwin1. In this way the background counts due to dark-current pulses were effectively suppressed. With the high voltage used, about 900 volts, the counter gave no pulses without the phosphor.
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References
Morton and Sherwin, Rev. Sci. Instr., 20, 766 (1949).
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Fowler, Lauritsen and Lauritsen, Rev. Mod. Phys., 20, 236 (1948).
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Rossi and Staub, “Ionization Chambers and Counters”, Table 5, 1.
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LÖNSJÖ, O. Efficiency of a Scintillation Counter with Anthracene Phosphor for High-Energy Gamma-Rays. Nature 169, 365–366 (1952). https://doi.org/10.1038/169365a0
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DOI: https://doi.org/10.1038/169365a0
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