✦ LIBER ✦

Enhancements to the spatial resolution and sensitivity of the MWPC-based PETRRA positron camera

✍ Scribed by D. Kitou; R. Stephenson; R.J. Ott

Publisher: Elsevier Science
Year: 2007
Tongue: English
Weight: 158 KB
Volume: 573
Category: Article
ISSN: 0168-9002
DOI: 10.1016/j.nima.2006.11.002

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✦ Synopsis

PETRRA is a large-area, low-cost positron camera based on coupling BaF 2 crystals to a multi-wire proportional chamber filled with a photo-sensitive gas tetrakis-dimethylamino ethylene (TMAE). The performance of this camera is comparable to the commercially available systems except for a lower sensitivity to 511 keV g-rays obtained using the 1 cm thick crystals. In order to improve the camera's g-ray detection efficiency without losing spatial resolution, measurements with different crystal thickness were performed on a small prototype detector. The results show that by using segmented crystals it is possible to increase the detection efficiency using thicker crystals whilst retaining acceptable spatial resolution.

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