Gamma-ray imaging with a large micro-TPC and a scintillation camera

✍ Scribed by K. Hattori; S. Kabuki; H. Kubo; S. Kurosawa; K. Miuchi; T. Nagayoshi; H. Nishimura; Y. Okada; R. Orito; H. Sekiya; A. Takada; A. Takeda; T. Tanimori; K. Ueno

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 298 KB
• Volume: 581
• Category: Article
• ISSN: 0168-9002
• DOI: 10.1016/j.nima.2007.08.039

✦ Synopsis

We report on the development of a large Compton camera with the full reconstruction of the Compton process based on a prototype. This camera consists of two kinds of detectors. One is a gaseous time projection chamber (micro-TPC) for measuring the energy and the track of a Compton recoil electron. The micro-TPC is based on a m-PIC and a GEM, which are micro-pattern gas detectors (MPGDs). The size of the micro-TPC was 10 cm  10 cm  8 cm in the case of the prototype, and we enlarged it to 23 cm  28 cm  15 cm. The other detector part is a NaI (Tl) Anger camera for measuring the scattered gamma-ray. With these informations, we can completely reconstruct a Compton event, and determine the direction of the incident gamma-ray, event by event. We succeeded in reconstructing events of incident 662 keV gamma-rays. The measured angular resolutions of the ''angular resolution measure'' (ARM) and the ''scatter plane deviation'' (SPD) were 9:3 and 158 (FWHM), respectively.