title: The Sandwich spectrometer for ultra low-level gamma-ray spectrometry.
abstract: The technical details and performance of the newly developed Sandwich spectrometer for ultra low-level gamma-ray spectrometry are presented. The spectrometer, which consists of two HPGe detectors, an active muon shield and a lead/copper shield with a convenient and rapid opening mechanism, is located in an underground laboratory at a depth of 500 m water equivalent. The data is collected in list mode, which enables off-line data analysis to identify muon-induced events and possible Ge detector crosstalk due to Compton scattering. The background count-rate from 40 to 2700 keV normalised to the mass of the Ge crystals is 220 day(-1)kg(-1).
authors.affiliation: EC-JRC-IRMM, Institute for Reference Materials and Measurements, Retieseweg 111, B-2440 Geel, Belgium. elisabeth.wieslander@gmail.com
authors.forename: J S Elisabeth
authors.initials: JS
authors.lastname: Wieslander
authors.forename: Mikael
authors.initials: M
authors.lastname: Hult
authors.forename: Joël
authors.initials: J
authors.lastname: Gasparro
authors.forename: Gerd
authors.initials: G
authors.lastname: Marissens
authors.forename: Marcin
authors.initials: M
authors.lastname: Misiaszek
authors.forename: Werner
authors.initials: W
authors.lastname: Preusse