Abstract
WITH the improved apparatus, already used by us in the investigation of positrons from thorium-active deposit, we have repeated our measurements of the positron spectrum, emitted by a thin-walled radon tube; a new determination of the ratio of the positron number to that of the particles of RaC was also made. The positron spectrum is shown in Fig. 1: for each point about 1,000 particles were counted. The ratio N+/N was found to be 2–3 × 104 (N+ = number of positrons, N = number of particles of RaC). Surrounding the source with a 1 mm. lead sheet, we could compare the number of positrons emitted by the source with that produced by the rays of RaC in lead: it was found that N+/N+ (Pb) = 0.91.
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References
A. I. Alichanow, A. I. Alichanian and M. S. Kosodaew, NATURE, 136, 475, Sept. 21, 1935.
D. Skobelzyn and E. Stepanowa, J. Phys., 6, 1; 1935.
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ALICHANOW, A., ALCHANIAN, A. & KOSODAEW, M. Emission of Positrons from Radioactive Sources. Nature 136, 719–720 (1935). https://doi.org/10.1038/136719b0
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DOI: https://doi.org/10.1038/136719b0
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