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- W1965603409 abstract "Development and performance of a low-background gamma-ray spectrometer are described. The spectrometer consists of a 131% efficient Ge detector in U-type configuration. The passive shielding consists of ultrapure lead of 6 thickness. A top muon guard is used as an active shielding. The spectrometer and shielding are positioned inside a steel room made of 6-thick pre-World War II iron. The steel room is located underground with 33 m of water-equivalent overburden. The total integrated background rate in the energy range 50-2,700 keV was measured at 0.068 counts per second per 100 cm3 Ge volume. The spectrometer serves as a reference instrument for low-level and highly accurate environmental radioactivity measurements. One specific application of 228Ra determination in drinking water is described. With a 1 l water sample, 1-step chemical procedure, and 1,000 min counting time, a detection limit Ld = 20 mBq/l (0.55 pCi/l) was reached, which meets the EPA mandated limit of 1 pCi/l. Methods of upgrading the spectrometer as well as the predicted improvements in 228Ra detection, including direct counting of water without chemical processing, are discussed." @default.
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- W1965603409 date "2002-08-01" @default.
- W1965603409 modified "2023-10-18" @default.
- W1965603409 title "Low-background gamma spectrometry for environmental radioactivity" @default.
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- W1965603409 doi "https://doi.org/10.1016/s0969-8043(02)00085-4" @default.
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