Title :
Newly developed low background hard X-ray/gamma-ray telescope with the well-type phoswich counters
Author :
Takahashi, T. ; Gunji, S. ; Hirayama, Motoko ; Kamae, T. ; Miyazaki, S. ; Sekimoto, Y. ; Tamura, T. ; Tanaka, M. ; Yamasaki, N.Y. ; Yamagami, T. ; Nomachi, M. ; Murakami, H.
Author_Institution :
Tokyo Univ., Japan
Abstract :
A low-background hard X-ray/gamma-ray telescope for balloon-borne experiments has been developed. The detector, called Welcome-1 (Well Type Compound Eye) utilizes newly developed well-type phoswich counters. In the well-type phoswich counter, the background from external and internal (nuclear activation) sources is reduced significantly. Welcome-1 consists of 64 GSO/CsI well-type phoswich counters assembled in the compound-eye configuration. The background levels at an altitude of 4 g/cm2 are 1×10-4/cm2/s/keV at 122 keV. The Crab nebula has been observed with a signal to background ratio better than unity between 100 and 200 keV
Keywords :
X-ray astronomy; X-ray detection and measurement; astronomical instruments; caesium compounds; gadolinium compounds; gamma-ray astronomy; gamma-ray detection and measurement; scintillation counters; 100 to 200 keV; Crab nebula; Gd2SiO5-CsI; Welcome-1; Well Type Compound Eye; balloon-borne experiments; compound-eye configuration; low-background hard X-ray/gamma-ray telescope; nuclear activation; well-type phoswich counters; Assembly; Collimators; Counting circuits; Extraterrestrial measurements; Network address translation; Probes; Radiation detectors; Telescopes; Wounds; X-ray detectors;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1992., Conference Record of the 1992 IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-0884-0
DOI :
10.1109/NSSMIC.1992.301364
