A scintillator detector consisting of a LaBr_(3)(Ce)(0.5%)scintillator,a photomultiplier tube(PMT),and an oscilloscope were used to study the neutron sensitivities of the LaBr_(3)(Ce)scintillator at the China Spallati...A scintillator detector consisting of a LaBr_(3)(Ce)(0.5%)scintillator,a photomultiplier tube(PMT),and an oscilloscope were used to study the neutron sensitivities of the LaBr_(3)(Ce)scintillator at the China Spallation Neutron Source(CSNS)Back-n white neutron source in the double-bunch and single-bunch operation modes,respectively.Under the two operational modes,the relative neutron sensitivity curves of the LaBr_(3)(Ce)scintillator in the energy regions of 1–20 MeV and 0.5–20 MeV were obtained for the first time.In the energy range of 1–20 MeV,the two curves were nearly identical.However the relative neutron sensitivity uncertainties of the double-bunch experiment were higher than those of the single-bunch experiment.The above results indicated that the single-bunch experiment's neutron sensitivity curve has a lower minimum measurable energy than the double-bunch experiment.Above the minimum measurable energy of the double-bunch experiment,there is little difference between the measured relative neutron sensitivity curves of the single-bunch and double-bunch experiments of the LaBr_(3)(Ce)scintillator and those of other scintillators with a similar neutron response signal intensity.展开更多
为了给强脉冲辐射场中应用超快闪烁探测器进行精密物理测试以及相关晶体抗核加固提供实验测量数据参考,针对近年新研制的Yb∶YAG超快无机闪烁体与GD40光电管构成的快闪烁探测器,在源强近万居的强稳态辐照场中,细致测量了辐射累计伽马剂...为了给强脉冲辐射场中应用超快闪烁探测器进行精密物理测试以及相关晶体抗核加固提供实验测量数据参考,针对近年新研制的Yb∶YAG超快无机闪烁体与GD40光电管构成的快闪烁探测器,在源强近万居的强稳态辐照场中,细致测量了辐射累计伽马剂量从约1 Gy开始到最高约1 k Gy全过程中Yb∶YAG超快闪烁探测器输出电流的变化数据;在测点注量率大于1017cm-2·s-1的"强光一号"短γ脉冲辐射场中,测量了Yb∶YAG超快闪烁探测器输出脉冲波形响应情况。实验测量结果表明:在强稳态辐射场情况下,对应累计剂量5~10Gy时,YAG(Yb)闪烁探测器灵敏度下降约5~10%(相对辐照1 Gy时的情况);测点累计伽马剂量约1 k Gy时,Yb∶YAG超快闪烁探测器的电流输出与约1 Gy时的比值约50%;短γ脉冲辐射情况下,测点累计注量约4×109cm-2,Yb∶YAG超快闪烁探测器输出电流约1 A时,灵敏度下降约10%(相对累计注量约3×109cm-2的情况),当测点注量大于1010cm-2(累积剂量超过100 m Gy),Yb∶YAG超快闪烁探测器会出现较明显的损伤现象。展开更多
采用复合金属收集极设计的真空康普顿探测器,使伽马探测灵敏度有效提高。为表征探测器测量信号的质量和可靠性,需要对探测器的γ/n鉴别本领进行评估。应用强钴源(能量1.25 Me V)伽马和DT(能量14 Me V)中子源对这种探测效率增强的新型真...采用复合金属收集极设计的真空康普顿探测器,使伽马探测灵敏度有效提高。为表征探测器测量信号的质量和可靠性,需要对探测器的γ/n鉴别本领进行评估。应用强钴源(能量1.25 Me V)伽马和DT(能量14 Me V)中子源对这种探测效率增强的新型真空探测器灵敏度进行实验测量,采用蒙特卡罗模拟法(MC)模拟统计收集极输出净电子数的方法,对其在裂变能量区几个特征能量点的伽马、中子灵敏度进行模拟计算。结果表明:对于中子、伽马能量为1.25 Me V的情况,这种新型真空康普顿探测器的γ/n鉴别本领,理论模拟计算值为40.94,综合理论计算和实验测量结果的实验推算评估值为28.31;属于适合中子、伽马混合场中测量伽马的可选探测器。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.11905196)。
文摘A scintillator detector consisting of a LaBr_(3)(Ce)(0.5%)scintillator,a photomultiplier tube(PMT),and an oscilloscope were used to study the neutron sensitivities of the LaBr_(3)(Ce)scintillator at the China Spallation Neutron Source(CSNS)Back-n white neutron source in the double-bunch and single-bunch operation modes,respectively.Under the two operational modes,the relative neutron sensitivity curves of the LaBr_(3)(Ce)scintillator in the energy regions of 1–20 MeV and 0.5–20 MeV were obtained for the first time.In the energy range of 1–20 MeV,the two curves were nearly identical.However the relative neutron sensitivity uncertainties of the double-bunch experiment were higher than those of the single-bunch experiment.The above results indicated that the single-bunch experiment's neutron sensitivity curve has a lower minimum measurable energy than the double-bunch experiment.Above the minimum measurable energy of the double-bunch experiment,there is little difference between the measured relative neutron sensitivity curves of the single-bunch and double-bunch experiments of the LaBr_(3)(Ce)scintillator and those of other scintillators with a similar neutron response signal intensity.
文摘为了给强脉冲辐射场中应用超快闪烁探测器进行精密物理测试以及相关晶体抗核加固提供实验测量数据参考,针对近年新研制的Yb∶YAG超快无机闪烁体与GD40光电管构成的快闪烁探测器,在源强近万居的强稳态辐照场中,细致测量了辐射累计伽马剂量从约1 Gy开始到最高约1 k Gy全过程中Yb∶YAG超快闪烁探测器输出电流的变化数据;在测点注量率大于1017cm-2·s-1的"强光一号"短γ脉冲辐射场中,测量了Yb∶YAG超快闪烁探测器输出脉冲波形响应情况。实验测量结果表明:在强稳态辐射场情况下,对应累计剂量5~10Gy时,YAG(Yb)闪烁探测器灵敏度下降约5~10%(相对辐照1 Gy时的情况);测点累计伽马剂量约1 k Gy时,Yb∶YAG超快闪烁探测器的电流输出与约1 Gy时的比值约50%;短γ脉冲辐射情况下,测点累计注量约4×109cm-2,Yb∶YAG超快闪烁探测器输出电流约1 A时,灵敏度下降约10%(相对累计注量约3×109cm-2的情况),当测点注量大于1010cm-2(累积剂量超过100 m Gy),Yb∶YAG超快闪烁探测器会出现较明显的损伤现象。
文摘采用复合金属收集极设计的真空康普顿探测器,使伽马探测灵敏度有效提高。为表征探测器测量信号的质量和可靠性,需要对探测器的γ/n鉴别本领进行评估。应用强钴源(能量1.25 Me V)伽马和DT(能量14 Me V)中子源对这种探测效率增强的新型真空探测器灵敏度进行实验测量,采用蒙特卡罗模拟法(MC)模拟统计收集极输出净电子数的方法,对其在裂变能量区几个特征能量点的伽马、中子灵敏度进行模拟计算。结果表明:对于中子、伽马能量为1.25 Me V的情况,这种新型真空康普顿探测器的γ/n鉴别本领,理论模拟计算值为40.94,综合理论计算和实验测量结果的实验推算评估值为28.31;属于适合中子、伽马混合场中测量伽马的可选探测器。
