Author/Authors :
Takahashi، نويسنده , , Michiaki and Kabuki، نويسنده , , Shigeto and Hattori، نويسنده , , Kaori and Higashi، نويسنده , , Naoki and Iwaki، نويسنده , , Satoru and Kubo، نويسنده , , Hidetoshi and Kurosawa، نويسنده , , Shunsuke and Miuchi، نويسنده , , Kentaro and Nakamura، نويسنده , , Kiseki and Nishimura، نويسنده , , Hironobu and Parker، نويسنده , , Joseph D. and Sawano، نويسنده , , Tatsuya and Takad، نويسنده ,
Abstract :
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/C2H6 (90:10) at 1 atm. The efficiency in Ar/CF4/isoC4H10 (54:40:6) at 1.4 atm was also ∼ 2 times higher than in Ar/C2H6 (90:10) at 1 atm.
Keywords :
Gaseous detector , Time projection chamber , ? -PIC , Compton imaging , GEM , CF4
