Performance test of Si PIN photodiode line scanner for thermal neutron detection
Performance test of Si PIN photodiode line scanner for thermal neutron detection
复制标题
热中子探测用Si PIN光电二极管线扫描仪性能测试
DOI：
10.1016/j.nima.2011.08.014
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发表时间：
2011
影响因子：
1.4
通讯作者：
A. Yoshikawa
中科院分区：
文献类型：
--
作者：
D. Totsuka;T. Yanagida;K. Fukuda;N. Kawaguchi;Y. Fujimoto;J. Pejchal;Y. Yokota;A. Yoshikawa
利用Si PIN光电二极管行扫描器和掺Eu的LiCaAlF_6晶体闪烁体进行了热中子成像。光电二极管的像素尺寸为1.18mm（宽）×3.8mm（长），间距为0.4mm，具有192个线阵通道。掺Eu的LiCaAlF_6经热中子激发后的发射峰位于370和590 nm处，相应的光电二极管的光子灵敏度分别为0.04和0.34A/W。将1.18mm（宽）×3.8mm（长）×5.0mm（厚）的抛光闪烁体块用几层聚四氟乙烯带包裹作为反射器，并通过硅脂与光电二极管光耦合。JRR-3 MUSASI束线发射13.5meV热中子，通量为8× 105 n/cm ~ 2s，用于成像试验。作为成像对象，Cd板以50 mm/s的速度垂直于热中子束移动。模拟积分时间设为416.6μs，信号经delta-sigma A/D转换器转换。经过图像处理后，利用掺Eu的LiCaAlF 6闪烁体与PIN光电二极管线扫描器耦合，成功地获得了热中子辐照下运动Cd板的图像。
Thermal neutron imaging using Si PIN photodiode line scanner and Eu-doped LiCaAlF6crystal scintillator has been developed. The pixel dimensions of photodiode are 1.18mm (width)×3.8mm (length) with 0.4mm gap and the module has 192 channels in linear array. The emission peaks of Eu-doped LiCaAlF6after thermal neutron excitation are placed at 370 and 590nm, and the corresponding photon sensitivities of photodiode are 0.04 and 0.34A/W, respectively. Polished scintillator blocks with a size of 1.18mm (width)×3.8mm (length)×5.0mm (thickness) were wrapped by several layers of Teflon tapes as a reflector and optically coupled to the photodiodes by silicone grease. JRR-3 MUSASI beam line emitting 13.5meV thermal neutrons with the flux of 8×105n/cm2s was used for the imaging test. As a subject for imaging, a Cd plate was moved at the speed of 50mm/s perpendicular to the thermal neutron beam. Analog integration time was set to be 416.6μs, then signals were converted by a delta–sigma A/D converter. After the image processing, we successfully obtained moving Cd plate image under thermal neutron irradiation using PIN photodiode line scanner coupled with Eu-doped LiCaAlF6scintillator.