GAMMASPHERE-correction technique for detector charge trapping

Author

Goulding, F.S. ; Landis, D.A.

Author_Institution

Lawrence Berkeley Lab., California Univ., Berkeley, CA, USA

Volume

41

Issue

4

fYear

1994

fDate

8/1/1994 12:00:00 AM

Firstpage

1145

Lastpage

1149

Abstract

GAMMASPHERE uses 110 very large germanium detectors. Such detectors exhibit charge trapping effects on energy resolution initially due to a native electron trap that is present in virtually all germanium. Furthermore, radiation damage is a serious problem in GAMMASPHERE experiments, producing hole traps that degrade resolution and eventually require annealing to restore the original performance. The technique discussed here uses the current pulse shape from a detector to develop a parameter related to the radius of the largest interaction in the “track” of a gamma ray in the detector. Since the charge trapping loss in a signal can be related to the distance carriers travel, the “radius” parameter can be used by software to apply a trap correction to the signal

Keywords

annealing; carrier mobility; detector circuits; electron traps; gamma-ray detection and measurement; gamma-ray effects; nuclear electronics; pulse shaping circuits; semiconductor counters; 110 very large Ge detectors; GAMMASPHERE; Ge; annealing; correction technique; current pulse shape; degrade resolution; detector charge trapping; distance carriers travel; energy resolution; gamma ray; hole traps; native electron trap; radiation damage; semiconductor; Annealing; Degradation; Electron traps; Energy resolution; Gamma ray detection; Gamma ray detectors; Germanium; Pulse shaping methods; Shape; Signal restoration;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.322873

Filename

322873