首页> 外文期刊>Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment >Improvement of the response of a rem-meter based on prompt gamma ray detection to high-energy neutrons up to 1 GeV
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Improvement of the response of a rem-meter based on prompt gamma ray detection to high-energy neutrons up to 1 GeV

机译:改进的基于快速伽马射线探测的雷姆计对高达1 GeV的高能中子的响应

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摘要

Prompt gamma emissions from a system containing Borated High Density Polyethylene (BHDPE) covered by lead (Pb) have been estimated for incident neutron energies from 0.01 eV up to 1 GeV using the FLUKA Monte Carlo simulation code. The areas under the photo peaks of the emitted prompt gammas are linearly combined to approximate the ICRP recommended energy dependent neutron dose conversion coefficients to estimate the neutron ambient dose equivalent. An enhancement in the prompt gamma emission is observed in the system above 14 MeV of incident neutron energy because of neutron multiplication due to (n, xn) reactions in Pb. Monte Carlo simulation results are used to optimize the thickness of the Pb-cover and the boron content in BHDPE. Different workplace neutron spectra are used to computationally validate the present method. The photo peak areas from different prompt gammas emitted from H, B, C and Pb in the proposed system, when multiplied with appropriate coefficients and summed, can predict neutron ambient dose equivalent with good accuracy for both high energy (up to 1 GeV) and low energy (down to 0.01 eV) neutrons.
机译:使用FLUKA蒙特卡洛模拟代码,估算了入射中子能量从0.01 eV到1 GeV的含硼(Pb)的硼酸高密度聚乙烯(BHDPE)系统的迅速伽马发射。发射的瞬变伽马的光峰下的区域被线性组合以近似ICRP建议的能量依赖性中子剂量转换系数,以估计中子环境剂量当量。由于Pb中的(n,xn)反应引起的中子倍增,在入射中子能量超过14 MeV的系统中观察到了瞬发伽马发射的增强。蒙特卡罗模拟结果用于优化BHDPE中的铅覆盖层厚度和硼含量。使用不同的工作场所中子光谱来计算验证本方法。在所提出的系统中,从H,B,C和Pb发出的不同瞬变伽马发射的光峰面积与适当的系数相乘并相加后,就可以预测高能量(最高1 GeV)和高能量时的中子环境剂量当量。低能量(低至0.01 eV)的中子。

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