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New pre-soaking technique for PADC and application to wide-range personal neutron dosimeter

机译:PADC的新预浸技术及其在大范围个人中子剂量计中的应用

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摘要

Poly allyl diglycol carbonate (PADC) plastic has been widely used as one of most sensitive detectors for personal neutron dosimeter. However, a considerably large number of false pits, which are very difficult to he distinguished from etched tracks induced by neutrons, appear even on the surface of non-irradiated PADC plastic. We have developed a new pre-soaking technique where PADC is soaked in a chemical solution before etching process. Owing to this procedure, the number of false background pits could be successfully reduced by one tenth compared with that for non-treated PADC samples. We have also applied this improved type of PADC practically to personal neutron dosimetry, coupled with a polyethylene sheet for fast neutrons in MeV region and a boron nitride sheet for lower energy neutrons. The measured detection efficiency of the dosimeter mounted on the water phantom was compared with results calculated by Monte Carlo simulation using the MCNP4C2 code. It was confirmed that the energy response of the dosimeter evaluated by the sum of etch-pits on two regions would agree well with the energy dependence of the neutron-fluence to personal-dose-equivalent conversion coefficient given by ICRP Publication 74. (C) 2008 Elsevier Ltd. All rights reserved.
机译:聚碳酸烯丙二醇酯(PADC)塑料已被广泛用作个人中子剂量计最灵敏的检测器之一。但是,即使在未经辐照的PADC塑料表面上也出现了大量假点,这很难与中子引起的蚀刻痕迹区分开来。我们开发了一种新的预浸技术,其中在蚀刻工艺之前将PADC浸入化学溶液中。由于该程序,与未处理的PADC样品相比,假背景坑的数量可以成功减少十分之一。我们还将这种改进型的PADC实际上应用于个人中子剂量测定,并与用于MeV区域中速中子的聚乙烯片材和用于较低能中子的氮化硼片材相结合。将安装在水体模型上的剂量计的检测效率与使用MCNP4C2代码通过蒙特卡洛模拟计算的结果进行比较。可以确认,通过两个区域上的蚀刻坑之和评估的剂量计的能量响应将与ICRP出版物74中给出的中子注量对个人剂量当量转换系数的能量依赖性很好地吻合。 2008 Elsevier Ltd.保留所有权利。

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