Development of an ElectronTracking Compton Camera using CF4 gas at high pressure for improved detection efficiency
Development of an ElectronTracking Compton Camera using CF4 gas at high pressure for improved detection efficiency
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使用高压 CF4 气体开发电子跟踪康普顿相机，以提高检测效率
DOI：
10.1016/j.nima.2010.06.305
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发表时间：
2011
期刊：
影响因子：
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他13名
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作者：
Michiaki Takahashi;Hidetoshi Kubo;Toru Tanimori;他13名
我们开发了一台用于医学成像和MeV伽马射线天文学的电子跟踪康普顿相机(ETCC)。该探测器由气体时间投影室(μ-TPC)和像素闪烁体阵列组成。为了提高检测效率，我们对μ-TPC中的气体混合物进行了优化，并在高压下运行。考察了μ-TPC的气体增益、漂移速度、能量分辨率和位置分辨率等基本特性，并在此基础上测量了效率和角分辨率。在Ar/∼_4/ISO_4H_(10)(54：40：6)中，在1.4atm获得了稳定的气体增益20,000。在1.4atm时，Ar/C4H4/IsoC4H10(54：40：6)中的扩散常数比1atm时Ar/C2H6(90：10)中的扩散常数∼高2倍。Ar/C4H4/IsoC4H10(54：40：6)在1.4atm时的效率也是Ar/C2H6(90：10)在1atm时的∼2倍。
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 1.4atm. The diffusion constant in Ar/CF4/isoC4H10(54:40:6) at 1.4atm was ∼2 times better than in Ar/C2H6(90:10) at 1atm. The efficiency in Ar/CF4/isoC4H10(54:40:6) at 1.4atm was also ∼2 times higher than in Ar/C2H6(90:10) at 1atm.