共查询到17条相似文献,搜索用时 46 毫秒
1.
2.
3.
4.
分别以高斯聚变中子谱和麦克斯韦裂变中子谱为源谱,采用Monte-Carlo方法,对中子从不同的源高度到达不同轨道高度及不同角度处的中子注量进行数值计算,通过对计算结果进行曲线拟合,获得中子注量的空间分布规律。同时引入方向散射因子的概念,并通过对方向散射因子变化规律的研究来获得中子的大气散射规律。 相似文献
5.
针对LiF-TLD在n-γ混合场的区分测量、抗核辐射加固实验和辅助核查时,存在TLD吸收剂量响应的LET效应问题,开展了TLD对中子响应的LET效应实验研究。研究工作从实际应用角度出发,优选了目前国内重视现性指标最好的LiF-TLD探测器,设计了从热中子至14MeV中子的辐照装置,进行了严格的实验测试和必要的理论计算,得出了LiF-TLD对较宽能区中子响应的LET效应因子。其结果可用于n-γ混合场的区分测量、抗核辐射加固实验和核查。 相似文献
6.
介绍国产~6LiF、~7LiF热释光剂量计,反应堆热柱、静电加速器、高压倍加器及Am-Be中子源,中子剂量当量—照射量转换标定实验方法。给出100 keV~10 MeV中子通用标定曲线;14.87 MeV中子专用标定曲线实验结果。 相似文献
7.
8.
介绍了以D-D密封中子发生器为源获得热中子的小型装置,用实验的方法确定了从聚乙稀慢化体内引出热中子的最佳条件,为开展热中子的实际应用了一种较好的热中子源。 相似文献
9.
10.
11.
12.
《Journal of Nuclear Science and Technology》2013,50(11):949-957
A simple formula which describes multi-scattered neutron flux in a spherical cavity was derived based on the albedo concept. The formura treats a neutron source which has an arbitrary energy-angle distribution and is placed at any point in the cavity. The derived formula was applied to the estimation of neutron fluxes in two cavities, i. e. a spherical concrete cell with a 14-MeV neutron source at the center and the “YAYOI” reactor cavity with a pencil beam of reactor neutrons. The results of the analytical formula agreed very well with the reference data in the both problems. It was concluded that the formula is applicable to estimate the neutron fluxes in a spherical cell except for special cases that tangential source neutrons are incident to the cavity wall. 相似文献
13.
《Journal of Nuclear Science and Technology》2013,50(11):937-948
An efficient albedo Monte Carlo method newly developed has been studied by analyzing two types of experiments on neutron streaming. The method is characterized by employing the energy-angle dependent doubly differential albedos for slab, which can be calculated in a short computer time with a one-dimensional transport theory, such as the Sn method and more efficient invariant imbedding method. This paper describes the features of the present albedo Monte Carlo method, including fundamental formulas. In the analyses of the neutron streaming experiments, the calculated results agreed with the measured data within a factor of 2 for a benchmark experiment at the YAYOI reactor and within a factor of 3 for an SNR sodium duct mock-up experiment. It is concluded that the present albedo Monte Carlo method is practical and applicable to the reactor shielding analysis concerning radiation streaming. 相似文献
14.
描述了一种联合使用活化探测器和成像盘技术(IP)探测中子注量的方法。利用这种方法测量了高能中子束线装置KENS(KEKspallationneutronsourcefacility)中混凝土屏蔽体内中子的空间分布。高能中子注量衰减的实验结果与使用蒙特卡罗程序MARS14模拟计算的结果符合很好。结果表明,联合使用活化探测器和成像盘技术可以同时测量多个位置的中子注量,直观展现出混凝土屏蔽体内中子强度的分布情况。 相似文献
15.
16.
医院中子照射器是基于微型反应堆而设计的专门用于硼中子俘获治疗(BNCT)的核反应堆装置,其额定功率为30 kW。在堆芯相对两侧分别设有一条热中子束流和超热中子束流用于病人照射,在热中子束流内引出一条实验用热中子束流,用于瞬发γ法测量病人血硼浓度。本工作利用235U裂变靶和白云母探测片测量了热、超热和实验用热中子束流出口处的热中子绝对注量率。结果显示,在30 kW额定功率运行时,热、超热和实验用热中子束流出口处的热中子注量率分别为1.67×109、2.44×107和3.03×106 cm-2•s-1。以上结果达到了BNCT设计要求,并能满足瞬发γ测量血硼浓度的要求。 相似文献