An active background discrimination technique using a multiple detector event by event recording system
For rare event experiments (environmental, solar neutrino, beta beta decay and dark matter) a careful selection of construction materials of the detectors with respect to low radioactive contamination is fundamental. Low-level gamma ray spectrometry serves this purpose best. To improve the sensitivity of a germanium detector, background reduction is a prerequisite. This paper describes an active background discrimination technique, which in principle is a coincidence method. Instead of an active veto, event-by-event recording is used. The technique allows to distinguish between fast muon induced events, compton events and radioimpurity events. These background events can then be subtracted, leading to a smaller statistical uncertainty of the net signal from the sample. From the recorded data the muon flux can be extracted as well. Experiments at ground level and in a depth of 500 m water equivalent are described.
Bibliographic Reference: Paper presented: ICRM 95, Seville (ES), October 2-6, 1995
Availability: Available from (1) as Paper EN 39452 ORA
Record Number: 199512091 / Last updated on: 1996-01-15
Original language: en
Available languages: en