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Appl Radiat Isot. 2017 Aug;126:191-193. doi: 10.1016/j.apradiso.2016.12.031. Epub 2016 Dec 21.

A second-generation low-background gamma-ray spectrometer.

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Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, MD 20899-8395, United States. Electronic address:


For the ultimate sensitivity in trace radiochemical analysis, the radiation detector must have high efficiency and low background. A low-background gamma-ray spectrometer in regular use at NIST for over twenty years is being supplemented by a new system, improved in several ways. The new detector is much larger, a shield of iron reduces cosmic neutron background compared with lead, large plastic scintillators reduce the muon continuum background, and a digital data acquisition system gives new opportunities for optimization.


Background reduction; Cosmic-ray muons; Cosmic-ray neutrons; Determination limit; Gamma-ray spectrometry; Germanium detector

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