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Absorbtivity thickness conversion
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[QUOTE="Astronuc, post: 6086306, member: 15685"] The accepted mean energy of betas from [SUP]90[/SUP]Sr is 195.8 keV (from NNDC, BNL). So if one measured 212.4 keV, the error would be 8.5%. Ref: https://www.nndc.bnl.gov/chart/decaysearchdirect.jsp?nuc=90Sr&unc=nds The maximum energy of a beta from [SUP]90[/SUP]Sr is 0.546 MeV, and the most probable energy is about 1/3 of the maximum. An anti-neutrino takes some of the energy. Find a beta spectrum for [SUP]90[/SUP]Sr and other beta emitters. The following paper reports a mean energy of 196.1 keV for the average beta energy. Robert J. Budnitz, STRONTIUM-90 AND STRONTIUM-89: A REVIEW OF MEASUREMENT TECHNIQUES IN ENVIRONMENTAL MEDIA, Lawrence Berkeley Laboratory - [URL]https://www.osti.gov/servlets/purl/4236199/[/URL] J. Mantel, "The Beta Ray Spectrum and Averege Energy of Several Isotopes of Interest in Medicine and Biology", Int. J. Appl. Radiat. Isotopes 23, 407 (1972). Note that the decay product of [SUP]90[/SUP]Sr is [SUP]90[/SUP]Y, which has a beta of maximum energy 2.28 MeV, and an average energy of ~933.1 keV, so some activity one counts would be coming from [SUP]90[/SUP]Y. The beta from Y would increase the apparent energy of the less energetic beta from Sr. Decay of [SUP]90[/SUP]Y is more complicated. https://www.nndc.bnl.gov/chart/decaysearchdirect.jsp?nuc=90Y&unc=nds In designing shielding for a given isotopic source, one must consider the decay chain and gamma radiation in addition to betas. [/QUOTE]
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