Abstract
Abstract The intensity of the K X-ray peak from β-ray sources of Pr143 (Eβmax 0·92 MeV) and Ce144-Pr144 (Ebmax 2·98 MeV) sandwiched by tin or lead radiators was measured with a NaI (TI) scintillation spectrometer. The following maximum yields given as photons per disintegration were found: tin + Pr143, (15–35 keV): 0·028 at a radiator thickness of 68 mg/cm2, lead + Pr143, (60–100 keV): 0·043 at 120 mg/cm2, and lead + Ce144−Pr144 (60–100 keV): 0·21 at 270 mg/cm2. These results together with those of Liden and Starfelt show that: (1) The ratio between the number of photons in the K X-ray peak and the total number of high energy bremsstrahlung photons for optimum radiator thickness is about 3:1 for low-energy betas + tin, and about 1:1 for high-energy betas + lead. (2) The K X-ray peak intensity increases with Eβmax and with the Z of the radiators; but so does the high-energy bremsstrahlung. The radiator thickness for maximum yield increases with Eβmax at low energies and levels off at a value of about 300 mg/cm2 for high-Z radiators and Eβmax > 3 MeV. Some practical applications are commented upon, particularly the possibilities of Kr85.
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