Characterisation of an ultra low-background point contact HPGe well-detector for an underground laboratory. (April 2018)

• Record Type: Journal Article
• Authors: Hult, Mikael; Marissens, Gerd; Stroh, Heiko; Lutter, Guillaume; Tzika, Faidra; Marković, Nikola
• Is Part Of: Applied radiation and isotopes. Volume 134(2018:Apr.)
• Page Start: 446
• Page End: 449
• Publication Date: 2018-04
• Subjects: Radiology -- Periodicals; Radiation -- Industrial applications -- Periodicals; Nuclear chemistry -- Periodicals; Internet resource; Periodical; 660.298
• DOI: 10.1016/j.apradiso.2017.08.002
• Languages: English
• ISSNs: 0969-8043

Abstract

Abstract: Since a few years there are well-type HPGe-detectors with a small, point-like, anode contacts available commercially. This paper describes the characterisation of the first ultra low-background, so-called, SAGe™ well detector with regards to resolution and background performance. Inside a passive lead/copper shield in the underground laboratory HADES a background count rate of 690 ± 6 d −1 (268 ± 3 d −1 per kg Ge) was recorded 19 months after taking it underground. Highlights: The first ultra low background SAGe™ well detector was installed 225 m underground. It has an energy resolution superior to standard well Ge-detectors. The Ge mass is 2.57 kg corresponding to about 483 cm 3 . After 19 months underground, the background count rate 40–2700 keV was 690 d −1 . With muon-suppression the background count rate 40–2700 keV was 601 d −1 .