Ion Pulse Ionization Chamber for Online Measurements of the Radon Activity Concentration
Ion Pulse Ionization Chamber for Online Measurements of the Radon Activity Concentration
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发表时间：
2021
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通讯作者：
Shi Guozhu;Chen Ruofu;Shen Aihua
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作者：
Shi Guozhu;Chen Ruofu;Shen Aihua
图1（彩色在线）像素为2.0 mm×2.0 mm的CsI（Tl）晶体阵列。掺铊碘化铯（CsI（Tl））闪烁体具有高密度、高发光效率、高抗辐射性、低成本等特点，广泛应用于核物理、核医学、安全检测等领域[1−3]。如图1所示，日本近代物理研究所研制了一种位置敏感CsI（Tl）晶体阵列，其像素尺寸为2.0 mm× 2.0 mm×10.0 mm，包括光反射材料的整个横截面尺寸为49.9 mm×51.2 mm，与多阳极位置敏感光电倍增管（PS-PMT）Hamamatsu H8500 C相耦合。像素之间的反光材料厚度为0.3mm。针对64通道多阳极平板PSPMT，设计了一种基于离散定位电路（DPC）桥的高效、经济的读出电路。
Fig. 1 (color online) The CsI(Tl) crystal array with pixels of 2.0 mm×2.0 mm. The thallium-doped cesium iodide (CsI(Tl)) scintillator is widely used in the fields of nuclear physics, nuclear medicine, safety inspection, for the characteristics of high density, high luminous efficiency, high radiation-hardness, low cost, etc[1−3]. As shown in Fig. 1, a position-sensitive CsI(Tl) crystal array, with the pixels size of 2.0 mm× 2.0 mm×10.0 mm and the whole cross section size including the light reflective material of 49.9 mm×51.2 mm, coupled with the multi-anode position sensitive photomultiplier tube (PS-PMT), Hamamatsu H8500C, has been developed at the Institute of Modern Physics. The thickness of light reflective material between the pixels is 0.3 mm. An effectiveand economical readout circuit based on discretized positioning circuit (DPC) bridge was designed for the 64-channel multi-anode flat panel PSPMT.