2011 Article Detectors ICNCT14 Physics

Development of a thick CdTe detector for BNCT–SPECT

Applied Radiation and Isotopes, 2011

Authors:   I. Murata,T. Mukai,S. Nakamura,H. Miyamaru,I. Kato,
Journal: Applied Radiation and Isotopes
Abstract: As well known, it is difficult to know the exact treatment effect of boron neutron capture therapy (BNCT). It depends on the irradiation time, which is changed rather flexibly. At present, it is once fixed before BNCT. Then the actual stopping time is adjusted during BNCT by some means like activation foils. The author’s group hence started development of a single-photon emission computed tomography (SPECT) system for BNCT to know the effect of BNCT in real time. By adopting a side surface (1×2mm2) of a CdTe detector (1×2×20mm3) as radiation entrance window, acceptable spatial resolution and high detection efficiency were simultaneously achieved. Also in about 30min acceptable number of counts for 478keV gamma-rays could be expected. In addition, employing a Schottky type detector the energy resolution could be improved. Discrimination of 478keV and annihilation gamma-rays would thus be successfully made. In the next phase, it is planned to design and develop an array type detector to be implemented in the BNCT–SPECT system.