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- W2019921672 abstract "A Compton rejection gamma ray spectrometer is described which is formed by a 2 in. x 13/4 in. NaI(Tl) crystal placed in a hole drilled in a 29.8 cm dia x 26.4 cm high cylindrical plastic scintillator. This ensemble is surrounded by a 20 cm thick iron shield. This apparatus gives a peak-to-total area ratio R of 0.610 for Cs/sup 137/, 0.542 for Mn/sup 54/, and 0.445 for Zn/sup 65/. For example, in the quantitative determination with a 9% error of Cs/sup 137/ in a mixture of Cs/sup 137/ (7.5 X 10/sup 2/ pC) + Zn/sup 65/ (4.5 x 10/sup 4/ pC) this device r educes the counting time from 74 to 20 minutes. The crystal background in the range from 0.1 to 3 Mev is also decreased by a factor of 54 by Fe shielding and furtherly of 2.3 by a-c device. in the specified interval the background counting rate is 37.8 cpm. This equipment is moderately priced and highly versatile: in particular the a-c mantle can be used as a well type counter or even as a total body monitor for small animals. When it is used as a well counter, it is so sensitive as to detectmore » few pC/cm/sup 3/ of a gamma emitting nuclide, with gamma energy around 1 Mev, dissolved in a 350 cm/sup 3/ solution, as in the case of Mn/sup 54/ or Co/sup 60/. (auth)« less" @default.
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- W2019921672 date "1963-03-01" @default.
- W2019921672 modified "2023-09-25" @default.
- W2019921672 title "A Compton rejection gamma rays spectrometer; utilization of the a.c. shield as a well type counter" @default.
- W2019921672 doi "https://doi.org/10.1016/0029-554x(63)90259-3" @default.
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