• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国卫生研究院文献>Springer Open Choice >Photoneutrons from a beryllium reflector: a potential source of problems with Zr–Au flux monitors in k0 standardization based neutron activation analysis
【2h】

Photoneutrons from a beryllium reflector: a potential source of problems with Zr–Au flux monitors in k0 standardization based neutron activation analysis

机译：铍反射器产生的光中子：基于k0标准化中子活化分析的Zr-Au通量监测仪的潜在问题根源

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The assumption that the shape of the epithermal neutron spectrum can be described, in any research reactor, by the 1/E1+α function is a fundamental starting point of the k0 standardization. This assumption may be questioned from a reactor physics viewpoint. The type of moderator, the existence of neutron reflectors, the additional production of (γ, n) neutrons and resonance capture by construction materials may be different for each reactor, with consequences for the shape of the neutron spectrum. This dependency may explain that various practitioners reported contradicting experiences with the use of Zr–Au flux monitors for the determination of the α-parameter. An objective view on the influence of the design of the reactor and irradiation facility on the shape of the neutron spectrum can be obtained by modeling. This has been applied in the Reactor Institute Delft for reactor configurations in which the irradiation facilities face the fuel elements with the presence of beryllium reflector elements. The Monte Carlo calculations indicate a distortion of the 1/E1+α relationship at the higher energy edge of the epithermal neutron spectrum. This distortion is attributed to the formation and thermalisation of both photoneutrons and (n, 2n) produced fast neutrons in the beryllium, and has a direct impact on the resonance activation of 95Zr, other than represented by the 1/E1+α function. The obtained relationship between neutron flux and neutron energy was also used for estimating the f-value and compared with the value obtained by the Delft Cr–Mo–Au flux monitor.
机译：可以在任何研究堆中通过1 / E 1 +α函数描述超热中子光谱形状的假设是k0标准化的基本出发点。从反应堆物理学的角度可能会质疑这一假设。慢化剂的类型，中子反射器的存在，（γ，n）中子的额外产生以及建筑材料对共振的捕获对于每个反应堆可能有所不同，从而对中子谱的形状产生影响。这种依赖关系可以解释为，各种从业者报告了使用Zr-Au通量监测仪确定α参数时相互矛盾的经验。可以通过建模获得关于反应堆和辐照设备设计对中子光谱形状的影响的客观观点。这已在代尔夫特反应堆研究所中用于反应堆配置，其中辐照设备面对带有铍反射器元件的燃料元件。蒙特卡洛计算表明，在超热中子谱的较高能量边缘，1 / E 1 +α关系发生了畸变。这种畸变归因于铍中光中子和（n，2n）产生的快速中子的形成和热化，并且对 95 Zr的共振活化具有直接影响，除了由1 / E 1 +α函数。获得的中子通量和中子能量之间的关系也用于估算f值，并与Delft Cr-Mo-Au通量监测仪获得的值进行比较。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号