Development of an Electron-Tracking Compton Camera using CF4 gas at high pressure for improved detection efficiency

Michiaki Takahashi, Shigeto Kabuki, Kaori Hattori, Naoki Higashi, Satoru Iwaki, Hidetoshi Kubo, Shunsuke Kurosawa, Kentaro Miuchi, Kiseki Nakamura, Hironobu Nishimura, Joseph D. Parker, Tatsuya Sawano, Atsushi Takada, Toru Tanimori, Kojiro Taniue, Kazuki Ueno

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


We have developed an Electron-Tracking Compton Camera (ETCC) for medical imaging and MeV gamma-ray astronomy. The ETCC consists of a gaseous Time Projection Chamber (μ-TPC) and pixel scintillator arrays. To improve the detection efficiency, we have optimized the gas mixture in the μ-TPC and operated the ETCC at high pressure. Basic characteristics such as the gas gain, drift velocity, energy resolution, and position resolution of the μ-TPC were examined, and using this optimization, both the efficiency and the angular resolution of the ETCC were measured. We achieved a steady gas gain of ∼20,000 in Ar/CF4/isoC4H10 (54:40:6) at 1.4 atm. The diffusion constant in Ar/CF4/isoC4H10 (54:40:6) at 1.4 atm was ∼2 times better than in Ar/C2H 6 (90:10) at 1 atm. The efficiency in Ar/CF4/isoC 4H10 (54:40:6) at 1.4 atm was also ∼2 times higher than in Ar/C2H6 (90:10) at 1 atm.

Original languageEnglish
Pages (from-to)150-153
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1
Publication statusPublished - 2011 Feb 2
Externally publishedYes


  • CF
  • Compton imaging
  • GEM
  • Gaseous detector
  • Time projection chamber
  • μ-PIC

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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