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The measurement of gamma ray-induced heating in a mixed neutron and gamma ray environment.

机译：中子和伽马射线混合环境中伽马射线引起的热量的测量。

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摘要

The problem of measuring the gamma heating in a mixed DT neutron and gamma ray environment was explored. A new detector technique was developed to make this measurement. Gamma heating measurements were made in a low-Z assembly irradiated with 14-MeV neutrons and (n,n{dollar}spprime{dollar}) gammas produced by a Texas Nuclear Model 9400 neutron generator. Heating measurements were made in the mid-line of the lattice using a proportional counter operating in the Continuously-varied Bias-voltage Acquisition (CBA) mode. The neutron-induced signal was separated from the gamma-induced signal by exploiting the signal rise-time differences inherent to radiations of different linear energy transfer coefficient (LET), which are observable in a proportional counter. The operating limits of this measurement technique were explored by varying the counter position in the low-Z lattice, hence changing the irradiation spectrum observed.; The experiment was modelled numerically to help interpret the measured results. The transport of neutrons and gamma rays in the assembly was modelled using the one-dimensional radiation transport code ANISN/PC. The cross-section set used for these calculations was derived from the ENDF/B-V library using the code MC{dollar}sp2{dollar}-2 for the case of DT neutrons slowing down in a low-Z material. The calculated neutron and gamma spectra in the slab and the relevant mass-stopping powers were used to construct weighting factors which relate the energy deposition in the counter fill-gas to that in the counter wall and in the surrounding material. The gamma energy deposition at various positions in the lattice is estimated by applying these weighting factors to the measured gamma energy deposition in the counter at those locations. The overall utility of this measurement technique for gamma heating in a low-Z structure irradiated by a broad energy range, low fluence mixed radiation field (characteristic of fusion blanket neutronics) was discussed.
机译：探讨了在DT中子和伽马射线混合环境中测量伽马加热的问题。开发了一种新的检测器技术来进行此测量。在用14 MeV中子和德克萨斯核9400型中子发生器产生的（n，n {sp}}）辐射的低Z组件中进行伽玛加热测量。使用在连续可变偏置电压采集（CBA）模式下运行的比例计数器在晶格的中线进行加热测量。通过利用不同线性能量传递系数（LET）的辐射固有的信号上升时间差异，将中子感应信号与γ感应信号分离开，这在比例计数器中可以观察到。通过改变低Z晶格中的相对位置探索了这种测量技术的操作极限，从而改变了观察到的辐照光谱。对实验进行了数值建模，以帮助解释测量结果。使用一维辐射传输代码ANISN / PC对组件中中子和伽马射线的传输进行建模。用于这些计算的横截面集是从ENDF / B-V库中获得的，其中使用了代码MC {dollar} sp2 {dollar} -2，用于DT中子在低Z材料中减速的情况。平板中计算出的中子和伽马谱以及相关的质量阻止能力被用于构造加权因子，这些因子将反向充填气体中的能量沉积与反向壁和周围材料中的能量沉积相关联。通过将这些加权因子应用于计数器在这些位置处测得的伽马能量沉积，可以估算出晶格中各个位置的伽马能量沉积。讨论了该测量技术在由宽能量范围，低能量密度混合辐射场（聚变毯中子学特征）照射的低Z结构中进行伽马加热的总体实用性。

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  • 作者

    Chiu, Henry Kui Chuen.;

  • 作者单位

    University of Illinois at Urbana-Champaign.;

  • 授予单位 University of Illinois at Urbana-Champaign.;
  • 学科 Engineering Nuclear.
  • 学位 Ph.D.
  • 年度 1992
  • 页码 175 p.
  • 总页数 175
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 原子能技术;
  • 关键词

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