共查询到20条相似文献,搜索用时 15 毫秒
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利用了实验室的标准γ源和Am-Be中子源,搭建了简单的中子探测器系统结构,研究了涂硼稻草管(BCS)和6LiF/ZnS(Ag)闪烁体中子探测器的γ甄别率与相对于3He管的中子探测效率。对比发现BCS的γ甄别率低至10-8,而6LiF/ZnS(Ag)闪烁体的γ甄别率预计在10-6。BCS和6LiF/ZnS(Ag)闪烁体相对于3He管的单位面积下中子探测效率分别为106.55%和218.12%。满足了替代3He的基本要求。 相似文献
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介绍了我国目前最广泛应用的LiF:Mg,Cu,P的研究新进展和优越性能及不足;介绍了新材料LiF:Mg,Cu,Si热释光片状探测器的最新研究进展;介绍了最新发展起来的α-Al2O3:C的光释光的优缺点及进展。 相似文献
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研制了一种具有能量分辨能力的中子个人剂量计。该个人剂量计由3层硅探测器组成,硅探测器周围装有6LiF、聚乙烯和含硼聚乙烯作为转化体、慢化体和吸收体。个人剂量计有直读和解谱两种工作模式。直读模式将中子能区划分为低能、中能和快中子3个能区,可实时测量。解谱模式可获得快中子能区的中子能量分布。利用GEANT4程序模拟了7 MeV γ射线的能量沉积谱,设置适当的甄别域以降低γ射线的影响。采用GEANT4程序模拟了个人剂量计对不同能量入射中子的个人剂量当量率响应。在加速器单能中子参考辐射场中完成了单能中子剂量响应的实验校准,对模拟计算的响应函数进行了实验修正,并得出了不同能区的平均中子个人剂量当量率响应。 相似文献
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ZHANG Gui-ying NI Bang-fa TIAN Wei-zhi WANG Ping-sheng WANG Zhi-qiang LUO Hai-long HUANG Dong-hui LIU Cun-xiong LU Peng XIAO Cai-jin HU Lian 《中国原子能科学研究院年报》2006,(1):132-133
本工作通过对^45Sc(n,γ)和(n,2n)反应截面实验测量数据的收集、筛选、分析和修正,并与理论模型分析相结合,对原先的评价数据进行改进,得到最终的推荐结果。与此同时,重新评价了(n,p)、(n,α)、(n,nα)、(n,T)和(n,^3He)等反应道的截面数据。 相似文献
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微结构半导体中子探测器(MSND)除了具有体积小、时间响应快、工作偏压低以及易于与读出电子学系统集成等优点外,还解决了二维平面半导体中子探测器存在的探测效率极低的问题(5%),其在军用和民用领域都具有良好的发展前景。介绍了微结构半导体中子探测器的中子探测原理,简述了其发展概况,综述了近年来的研究进展,展望了微结构半导体中子探测器的研究方向和应用前景。 相似文献
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ZHANG Gui-ying NI Bang-fa TIAN Wei-zhi WANG Ping-sheng LIU Cun-xiong HUANG Dong-hui LV Peng XIAO Cai-jin HU Lian 《中国原子能科学研究院年报》2006,(1):131-132
Reproducibility is an important parameter of bubble detectors used for personal neutron dose monitoring. This study presents a preliminary analysis on reproducibility of home-made bubble detectors using ISO standards as guidelines. Moreover the software "origin" was used in an attempt to find possible reasons causing some detectors failed to pass this test. 相似文献
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《Journal of Nuclear Science and Technology》2013,50(11):871-876
As a highly sensitive, simple and non-radioactive neutron dosimeter, CR-39 plastic plates doped with a boron compound: ortho-carborane were prepared. After thermal neutron irradiation, the plates were etched in an aqueous solution of 30%KOH, at 60°C for 2 to 16 h. The etch-pits generated by 10B(n, α)7Li reactions were then counted using an optical microscope or an automatic track counting system. The density of the etch-pits on an irradiated plate increases with the etching time. When the etching time is kept constant, the etch-pit density is proportional to the irradiated thermal neutron fluence. The proportional constant is termed “sensitivity”, which is 4.2 x 10?4 for a plate containing ortho-carborane at a concentration of 0.5% by weight and for etching time of 16 h. By considering background counts, a thermal neutron dose of 0.025 mSv can be measured with this plate. The plates are insensitive to visible-, UV-, X-, β- and γ-rays and are easy to handle because the detector and converter are incorporated. There is no possibility of underestimating the dose equivalent due to fading. Furthermore, the isotopes of boron are not radioactive and thus are radio- logically safe. 相似文献
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《IEEE transactions on nuclear science》1965,12(5):101-111
The neutron and gamma sensitivities of nine detectors were studied in experiments performed at the Sandia Pulsed Reactor (SPR). Of the detectors tested, six are predominantly gamma detectors at the SPR and three produce a significant fraction of their total current due to the neutron flux during a normal SPR burst. None of the detectors studied were found to be predominantly sensitive to the neutron flux during a normal SPR burst. Tests performed at pure gamma sources on a P-Intrinsic-N (PIN) diode detector are also described. The neutron induced current in the silicon detectors is treated theoretically. 相似文献
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在Burlin空腔理论基础上提出了1个经修改后可适用于兆伏级X(γ)能量固体剂量计的新空腔理论。它通过Monte-Carlo方法分别计算固体剂量计空腔内的初级光子粒子注量和散射光子粒子注量及它们相应产生的次级电子粒子注量,并按空腔尺寸所对应的电子射程,把高能和低能光子分开,计算初级光子和散射光子沉积在固体剂量计灵敏体积中的能量,即吸收剂量。为验证该空腔理论,用半导体固体剂量计在6MV医用电子直线加速器上进行了水模体输出因子测量,并模拟相同测量条件用新空腔理论对水模体输出因子进行了理论计算,其测量结果与计算结果在0.5%内符合。 相似文献
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Multilayered detectors with several configurations MDN1.01 and MDN1.02 are described. The algorithm of the NEDSUM-2 code,
which simulates the interaction of neutron fluxes with multilayered detectors and calculates their characteristics by the
Monte Carlo method, is described. The computational results obtained with the NEDSUM-2 and PRIZMA codes agree with one another
and with experiments performed at the Moscow Engineering Physics Institute and All-Russia Scientific-Research Institute of
Technical Physics for real detectors MDN1.01 and MDN1.02.
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Translated from Atomnaya Energiya, Vol. 99, No. 2, pp. 141–147, August 2005. 相似文献