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- W2000563478 abstract "The radioactive concentrations of 166mHo, 134Cs and 133Ba solutions have been standardised using a 4πβ–4πγ coincidence counting system we have recently set up. The detection in the beta channel is performed using various geometries of a UPS-89 plastic scintillator optically coupled to a selected low-noise 1 in. diameter photomultiplier tube. The light-tight thin capsule that encloses this beta detector is housed within the well of a 5 in.×5 in. NaI(Tl) monocrystal detector. The beta detection efficiency can be varied either by optical filtering or electronic discrimination when the electrons loose all their energy in the plastic scintillator. This 4πβ−4πγ coincidence system improves on our 4πβ(PC)–γ system in that its sample preparation is less labour intensive, it yields larger beta- and gamma-counting efficiencies thus enabling the standardisation of low activity sources with good statistics in reasonable time, and it makes standardising short-lived radionuclides easier. The resulting radioactive concentrations of 166mHo, 134Cs and 133Ba are found to agree with those measured with other primary measurement methods thus validating our 4πβ−4πγ coincidence counting system." @default.
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- W2000563478 date "2012-01-01" @default.
- W2000563478 modified "2023-09-27" @default.
- W2000563478 title "Primary activity measurements with a 4πβ–4πγ coincidence counting system" @default.
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- W2000563478 doi "https://doi.org/10.1016/j.apradiso.2011.07.017" @default.
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