不同体积聚乙烯样品泄漏中子飞行时间谱测量与模拟研究

丁琰琰; 聂阳波; 任杰; 阮锡超; 鲍杰; 姚泽恩

doi:10.7538/yzk.2017.51.02.0223

不同体积聚乙烯样品泄漏中子飞行时间谱测量与模拟研究

1.
兰州大学核科学与技术学院,甘肃兰州730000
2.
中国原子能科学研究院核数据重点实验室,北京102413

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- 刊出日期: 2017-02-19

Measurement and Simulation of Neutron Leakage Spectrum with Different Sized Polyethylene Samples

1.
School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
2.
Key Laboratory of Nuclear Data, China Institute of Atomic Energy, Beijing 102413, China

摘要

摘要: 采用T(d,n)⁴He脉冲中子源和中子飞行时间法测量了3种不同尺寸聚乙烯样品在60°方向的泄漏中子飞行时间谱。通过3种模拟模型（点探测器简化模型、点探测器复杂模型和环探测器复杂模型），应用MCNP程序分别模拟得到了泄漏中子飞行时间谱，并与实验数据进行比较。结果显示：对于小体积样品（ø13 cm×6 cm），3种模型的模拟数据和实验结果在n-p散射峰符合均很好；对于大体积样品（ø30 cm×ø30 cm×6 cm，40 cm×40 cm×6 cm），采用环探测器复杂模型的计算结果更加接近实验值。该研究工作为将来开展大体积样品基准检验奠定了基础。
- 飞行时间法 ,
- 聚乙烯 ,
- 泄漏中子飞行时间谱 ,
- T(d,n)⁴He脉冲中子源 ,
- MCNP程序
Abstract: The neutron leakage spectra were measured at 60° by using time-of-flight (TOF) method from three different sizes of polyethylene samples. The measured spectra were compared with the calculated ones simulated with MCNP using three different models (simplified point detector model, complex point detector model, complicated ring detector model), respectively. The result shows that for small sized sample（ø13 cm×ø6 cm）, the calculated results from different models all agree well with experimental ones in n-p scattering peak. For large sized samples （30 cm×30 cm×6 cm,ø40 cm×ø40 cm×6 cm）, the calculated results from complicated ring detector model agree better with the experiment. This conclusion is very important for the next step benchmark experiment with large sized sample.
- time-of-flight method ,
- polyethylene ,
- neutron leakage spectrum ,
- T(d,n)⁴He pulse neutron source ,
- MCNP code

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参考文献(11)

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文章访问数: 514
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不同体积聚乙烯样品泄漏中子飞行时间谱测量与模拟研究

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出版历程

Measurement and Simulation of Neutron Leakage Spectrum with Different Sized Polyethylene Samples

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