Individual Neutron Monitoring with CR-39 Detectors at an Accelerator Centre
Individual Neutron Monitoring with CR-39 Detectors at an Accelerator Centre
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在加速器中心使用 CR-39 探测器进行单独中子监测
DOI：
10.1093/oxfordjournals.rpd.a032869
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发表时间：
1999
影响因子：
1
通讯作者：
C. Wernli
中科院分区：
文献类型：
--
作者：
A. Fiechtner;C. Wernli
Paul Scherrer研究所（PSI）的一种新的个人中子剂量测量系统是基于化学蚀刻CR-39探测器（PN3），带有不同的散热器和自动读出系统Autoscan 60。PSI加速器中最相关的中子场的能量范围高达600 MeV，峰值能量约为1-5和50-100 MeV，这是由于混凝土屏蔽层中的蒸发和级联过程，以及迷宫入口处出现的部分热化光谱。用于PN3的主要散热器是用于快中子的聚乙烯（PE）和用于热中子和快中子的带锂的PE。对于极高的径迹密度（相当于高达5毫西弗的剂量），使用透射光谱仪进行评估，因为Autoscan 60的自动计数在剂量超过100毫西弗时达到饱和。该系统已经进行了线性测试，能量依赖性高达300 MeV中子能量，角依赖性和氡背景响应。然后对PSI的实际中子场进行了校准。这些高能场的检测极限约为0.3毫西弗。此外，还进行了计算，以确定剂量计对核电厂典型光谱的响应。
A new personal neutron dosimetry system at the Paul Scherrer Institute (PSI) is based on chemically etched CR-39 detectors (PN3) with different radiators, and an automatic readout system, the Autoscan 60. The most relevant neutron fields at the PSI accelerator have an energy range up to 600 MeV with peak energies around 1-5 and 50-100 MeV due to evaporation and cascade processes in the concrete shieldings, and partly thermalised spectra that occur at the entrance to the labyrinths. The main radiators used for PN3 are polyethylene (PE) for fast neutrons and PE with lithium for thermal and fast neutrons. For extremely high track densities (corresponding to a dose up to 5 Sv) a transmission spectrometer is used for evaluation, since automatic counting by Autoscan 60 saturates at doses above 100 mSv. The system has been tested for linearity, energy dependence up to 300 MeV neutron energy, angular dependence, and radon background response. It was then calibrated for realistic neutron fields at PSI. The detection limit for these high energy fields is about 0.3 mSv. In addition, calculations have been performed to determine the response of the dosemeter to typical spectra in nuclear power plants.