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- W1985804915 abstract "In 1991, the Physikalisch-Technische Bundesanstalt established an underground laboratory for dosimetry and spectrometry (UDO) at the Asse salt mine, near Braunschweig. Due to the depth of 925 m below ground (equivalent to about 2100 m of water), the cosmic ray muon intensity in this facility is reduced by more than 5 orders of magnitude. In addition, the low specific activity of the pure rock salt and a low concentration of radon lead to an extremely low ambient dose equivalent rate of less than 1 nSv/h. The UDO facility is therefore well suited for dosimetry at very low dose rates, as well as for Ultra-Low-Background (ULB) gamma-ray spectrometry. In 1998, a coaxial low-background HPGe-detector (88% relative efficiency, FWHM 2.0 keV at 1.33 MeV) with an extended shielding (20 cm low-activity lead, 1 cm electrolytic copper, N2-flushing) was installed at UDO; the count rate per mass of germanium, integrated over the energy range from 40 to 2750 keV, was measured to be 0.012 s(-1) kg(-1). Results from test measurements and first applications are reported. The design of a ULB gamma-detector system, presently under construction, is described." @default.
- W1985804915 created "2016-06-24" @default.
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- W1985804915 date "2000-07-01" @default.
- W1985804915 modified "2023-09-27" @default.
- W1985804915 title "The PTB underground laboratory for dosimetry and spectrometry" @default.
- W1985804915 cites W1975223108 @default.
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- W1985804915 doi "https://doi.org/10.1016/s0969-8043(00)00129-9" @default.
- W1985804915 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10879857" @default.
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