The light output function of a φ50.8 mm×50.8 mm BC501A scintillation detector was measured in the neutron energy region of 1 to 30 MeV by fitting the pulse height （PH） spectra for neutrons with the simulations...The light output function of a φ50.8 mm×50.8 mm BC501A scintillation detector was measured in the neutron energy region of 1 to 30 MeV by fitting the pulse height （PH） spectra for neutrons with the simulations from the NRESP code at the edge range. Using the new light output function, the neutron detection effciency was determined with two Monte-Carlo codes, NEFF and SCINFUL. The calculated effciency was corrected by comparing the simulated PH spectra with the measured ones. The determined effciency was verified at the near threshold region and normalized with a Proton-Recoil-Telescope （PRT） at the 8-14 MeV energy region.展开更多
本文对液闪法测氚探测限的影响因子进行了识别、筛选和定量分析,结合电解浓缩方法,提出了降低分析方法探测限的优化方案,并通过实验设计,对上述影响因子逐一进行了验证。实验结果表明,通过恰当选择测量道宽、本底水、闪烁瓶材质、闪烁...本文对液闪法测氚探测限的影响因子进行了识别、筛选和定量分析,结合电解浓缩方法,提出了降低分析方法探测限的优化方案,并通过实验设计,对上述影响因子逐一进行了验证。实验结果表明,通过恰当选择测量道宽、本底水、闪烁瓶材质、闪烁液及其与样品配比可以在不增加工作量的前提下将探测限降低至0.87 Bq/L;增加电解浓缩的预处理步骤能够大幅降低分析方法的探测限,进一步将其优化至38.5 m Bq/L。展开更多
文摘The light output function of a φ50.8 mm×50.8 mm BC501A scintillation detector was measured in the neutron energy region of 1 to 30 MeV by fitting the pulse height （PH） spectra for neutrons with the simulations from the NRESP code at the edge range. Using the new light output function, the neutron detection effciency was determined with two Monte-Carlo codes, NEFF and SCINFUL. The calculated effciency was corrected by comparing the simulated PH spectra with the measured ones. The determined effciency was verified at the near threshold region and normalized with a Proton-Recoil-Telescope （PRT） at the 8-14 MeV energy region.
文摘本文对液闪法测氚探测限的影响因子进行了识别、筛选和定量分析,结合电解浓缩方法,提出了降低分析方法探测限的优化方案,并通过实验设计,对上述影响因子逐一进行了验证。实验结果表明,通过恰当选择测量道宽、本底水、闪烁瓶材质、闪烁液及其与样品配比可以在不增加工作量的前提下将探测限降低至0.87 Bq/L;增加电解浓缩的预处理步骤能够大幅降低分析方法的探测限,进一步将其优化至38.5 m Bq/L。
