Balloon-borne sub-MeV gamma-ray imager using electron tracking gaseous TPC and scintillation camera

H. Kubo, K. Hattori, S. Kabuki, S. Kurosawa, K. Miuchi, T. Nagayoshi, H. Nishimura, Y. Okada, R. Orito, H. Sekiya, A. Takada, T. Tanimori, K. Ueno

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Citations (Scopus)

Abstract

A balloon-borne sub-MeV gamma-ray imaging detector for astrophysics has been developed. It measures a three dimensional track of a Compton-recoil electron and determines the incident direction of each photon in a reduced arc projected on the sky. Our developed detector consists of two parts: One is a gaseous time projection chamber (μ-TPC) with a size of 10×10×14 cm3 with a micro pixel chamber (μ-PIC) readout, which measures both the three dimensional track and the energy of the Compton recoil electron. The other is a position-sensitive scintillation camera enclosing the μ-TPC, which consists of arrays of pixellated GSO(Ce) scintillators coupled to multianodes PMTs and measures both the direction and the energy of the scattered gamma ray. By the full reconstruction of incident gamma rays from these measurements, we have successfully obtained gamma-ray images in the 0.1-0.9 MeV range. The angular resolutions (FWHM) were 8.5° and 120° for single photon with 662 keV for an angular resolution measure and a scatter plane deviation, respectively. The detector had no collimator, and the field of view was 1 sr. In order to measure both the cosmic and the atmospheric gamma-ray background in the sub-MeV region, a balloon equipped with this detector was launched from JAXA/ISAS Sanriku Balloon Center in Japan on September 1, 2006, and flew for 7 hours with the highest altitude of 35 km. Based on the detector, a larger detector with the μ-TPC with a size of 30×30×30 cm 3 is being developed in order to observe celestial objects in the sub-MeV region.

Original languageEnglish
Title of host publication2006 IEEE Nuclear Science Symposium - Conference Record
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages406-410
Number of pages5
ISBN (Print)1424405610, 9781424405619
DOIs
Publication statusPublished - 2006
Externally publishedYes
Event2006 IEEE Nuclear Science Symposium, Medical Imaging Conference and 15th International Workshop on Room-Temperature Semiconductor X- and Gamma-Ray Detectors, Special Focus Workshops, NSS/MIC/RTSD - San Diego, CA, United States
Duration: 2006 Oct 292006 Nov 4

Publication series

NameIEEE Nuclear Science Symposium Conference Record
Volume1
ISSN (Print)1095-7863

Other

Other2006 IEEE Nuclear Science Symposium, Medical Imaging Conference and 15th International Workshop on Room-Temperature Semiconductor X- and Gamma-Ray Detectors, Special Focus Workshops, NSS/MIC/RTSD
CountryUnited States
CitySan Diego, CA
Period06/10/2906/11/4

Keywords

  • Gamma-ray imaging
  • Gaseous detector
  • Scintillator
  • Time projection chamber

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Radiology Nuclear Medicine and imaging

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