Development of an MeV gamma-ray imaging detector

A. Takeda, H. Kubo, K. Miuchi, T. Nagayoshi, Y. Okada, R. Orito, A. Takada, T. Tanimori, M. Ueno, O. Bouianov, M. Bouianov
2003 2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515)  
An MeV gamma-ray imaging detector which makes a reconstruction of single photons possible has been developed. This MeV gamma-ray detector is a hybrid detector of a micro time projection chamber (micro-TPC) with a gaseous micro pixel chamber ( -PIC) readout and an enclosing scintillation camera. We developed a prototype of the MeV gamma-ray imaging detector with the micro-TPC of 10 10 8 cm 3 volume and an NaI(Tl) scintillator of 10 10 2.5 cm 3 size read by 25 single anode PMTs of 3 4 diameters,
more » ... nd succeeded in reconstructing the gamma-ray events with a radioactive source. The angular resolutions of the prototype detector were limited mainly by the tracking accuracy of the micro-TPC for minimum ionizing particles (MIPs) which is determined by the gas gain of the -PIC. We have, thus, developed an electrode structure of the -PIC using a new manufacture technology in order to improve the gas gain. As a result, a gas gain which is three-times higher than that of the previous -PIC has been obtained. This result is in good agreement with the simulation. Owing to this improvement of the electrode structure, not only the high gas gain but also a good gain uniformity has been achieved.
doi:10.1109/nssmic.2003.1352045 fatcat:zpqptjq3sngahbuwp4fufhlwjm