G. Onyshchenko, Ivan I. Yakymenko, B. Grynyov, V. Ryzhikov, O. Voronov, S. Naydenov
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In this work, we used a technique for recording the detector response in the photon counting mode and pulse filtering mode. Since the detector operates on the principle of detecting gamma quanta from the reactions (n, n 'γ), (n, n' γ)res, (n, γ)cap and others, this makes it possible (in a filtering mode) to isolate the mechanisms of cascade generation processes in the volume of the detector caused by secondary gamma quanta from excited states of compound nuclei. The gamma quanta of the elastic scattering reaction (n, n' γ) for the KDP: TL+ scintillator nuclei are the start of the cascade process of the discharge of excited isomeric states of the input, intermediate, and final nuclei. Measurements of the detection efficiency of fast neutrons were carried out with a KDP: TL+ crystal of size 18x18x42 mm in spherical geometry. The obtained detector reviews in units of impulse / particle for sources and 239Pu-Be and 137Cs were 3.57 and 1.44. In this case, a broadband path with a speed of 7 ns was used. In addition, the counting efficiency of the narrow-band tract measured simultaneously with a processing time of 1 μs and 6.4 μs. The received response from the KDP: TL+ detector (in units of impulse/particle) for both sources 239Pu-Be and 137Cs was 0.09 and 0.00029. The n/γ ratio coefficient was 310. The given measurements of a polystyrene-based scintillator size of 40×40×40 mm. The received response in a single photon-counting mode from the plastic detector (in units of impulse/particle) for both sources 239Pu-Be and 137Cs was 19.4 and 3.9. The n/γ ratio coefficients for detectors are also given: KDP: TL+ - 2.47 and UPS-923A - 4.97 in the 7 ns mode. The statistical error in measurements of the neutron detection efficiency was about ~ 5%.","PeriodicalId":199057,"journal":{"name":"3, 2020","volume":"74 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2020-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Counting Efficiency and Neutron/Gamma Ratio for KDP: Tl+ and UPS-923A Scintillators in a Single Photone Detection Mode\",\"authors\":\"G. Onyshchenko, Ivan I. Yakymenko, B. Grynyov, V. Ryzhikov, O. Voronov, S. Naydenov\",\"doi\":\"10.26565/2312-4334-2020-3-07\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"This research related to registration of the fast neutrons with a detector based on the inorganic KDP: TL+ mono crystal (KH2PO4 potassium dihydrogen phosphate) and plastic UPS-923A. The crystal of the KDP: TL+ detector grown from a water solution by the method of lowering the temperature. The high concentration of hydrogen nuclei in the KDP: TL+ crystal grid makes it possible to detect neutron radiation with an efficiency comparable to polystyrene scintillators. KDP: TL+ crystals have a high radiation resistance (up to 1010 neutrons/cm2), which significantly expands the spectrum of their application in high-energy physics applications, intense neutron fields. In this work, we used a technique for recording the detector response in the photon counting mode and pulse filtering mode. Since the detector operates on the principle of detecting gamma quanta from the reactions (n, n 'γ), (n, n' γ)res, (n, γ)cap and others, this makes it possible (in a filtering mode) to isolate the mechanisms of cascade generation processes in the volume of the detector caused by secondary gamma quanta from excited states of compound nuclei. 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引用次数: 0
摘要
本文研究了基于无机KDP: TL+单晶(KH2PO4磷酸二氢钾)和塑料UPS-923A的快中子配准探测器。用降低温度的方法在水溶液中生长出KDP: TL+探测器晶体。在KDP: TL+晶体网格中高浓度的氢核使得探测中子辐射成为可能,其效率可与聚苯乙烯闪烁体相媲美。KDP: TL+晶体具有很高的抗辐射能力(高达1010中子/cm2),这大大扩展了它们在高能物理应用、强中子场中的应用范围。在这项工作中,我们使用了一种记录光子计数模式和脉冲滤波模式下探测器响应的技术。由于探测器的工作原理是从(n, n' γ), (n, n' γ)res, (n, γ)cap等反应中检测伽马量子,这使得(在过滤模式下)有可能从复合核的激发态中分离出由次级伽马量子引起的探测器体积级联产生过程的机制。KDP: TL+闪烁体核的弹性散射反应的γ量子(n, n' γ)是输入核、中间核和最终核的激发异构体状态放电级联过程的开始。用KDP: TL+晶体进行了快中子探测效率的测量,晶体尺寸为18x18x42 mm,呈球形。所获得的探测器检波(脉冲/粒子单位)对源和239Pu-Be和137Cs分别为3.57和1.44。在这种情况下,使用了速度为7纳秒的宽带路径。同时测量了处理时间为1 μs和6.4 μs时窄带通道的计数效率。对于239Pu-Be和137Cs源,KDP: TL+探测器接收到的响应(脉冲/粒子单位)分别为0.09和0.00029。n/γ比系数为310。给出了聚苯乙烯基闪烁体尺寸为40×40×40 mm的测量值。239Pu-Be和137Cs源在单光子计数模式下从塑料探测器接收到的响应(脉冲/粒子单位)分别为19.4和3.9。同时给出了探测器的n/γ比系数:KDP: TL+ - 2.47和UPS-923A - 4.97。测量中子探测效率的统计误差约为~ 5%。
Counting Efficiency and Neutron/Gamma Ratio for KDP: Tl+ and UPS-923A Scintillators in a Single Photone Detection Mode
This research related to registration of the fast neutrons with a detector based on the inorganic KDP: TL+ mono crystal (KH2PO4 potassium dihydrogen phosphate) and plastic UPS-923A. The crystal of the KDP: TL+ detector grown from a water solution by the method of lowering the temperature. The high concentration of hydrogen nuclei in the KDP: TL+ crystal grid makes it possible to detect neutron radiation with an efficiency comparable to polystyrene scintillators. KDP: TL+ crystals have a high radiation resistance (up to 1010 neutrons/cm2), which significantly expands the spectrum of their application in high-energy physics applications, intense neutron fields. In this work, we used a technique for recording the detector response in the photon counting mode and pulse filtering mode. Since the detector operates on the principle of detecting gamma quanta from the reactions (n, n 'γ), (n, n' γ)res, (n, γ)cap and others, this makes it possible (in a filtering mode) to isolate the mechanisms of cascade generation processes in the volume of the detector caused by secondary gamma quanta from excited states of compound nuclei. The gamma quanta of the elastic scattering reaction (n, n' γ) for the KDP: TL+ scintillator nuclei are the start of the cascade process of the discharge of excited isomeric states of the input, intermediate, and final nuclei. Measurements of the detection efficiency of fast neutrons were carried out with a KDP: TL+ crystal of size 18x18x42 mm in spherical geometry. The obtained detector reviews in units of impulse / particle for sources and 239Pu-Be and 137Cs were 3.57 and 1.44. In this case, a broadband path with a speed of 7 ns was used. In addition, the counting efficiency of the narrow-band tract measured simultaneously with a processing time of 1 μs and 6.4 μs. The received response from the KDP: TL+ detector (in units of impulse/particle) for both sources 239Pu-Be and 137Cs was 0.09 and 0.00029. The n/γ ratio coefficient was 310. The given measurements of a polystyrene-based scintillator size of 40×40×40 mm. The received response in a single photon-counting mode from the plastic detector (in units of impulse/particle) for both sources 239Pu-Be and 137Cs was 19.4 and 3.9. The n/γ ratio coefficients for detectors are also given: KDP: TL+ - 2.47 and UPS-923A - 4.97 in the 7 ns mode. The statistical error in measurements of the neutron detection efficiency was about ~ 5%.