10B4C Multi-Grid as an alternative to 3He for Large Area Neutron Detectors
10B4C Multi-Grid as an alternative to 3He for Large Area Neutron Detectors
复制标题
DOI：
10.1109/tns.2012.2227798
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Jonathan Correa Magdalena
中科院分区：
文献类型：
--
作者：
Jonathan Correa Magdalena
尽管目前短缺，3 He仍然是中子散射科学中探测器最常见的中子转换器。然而，很明显，基于替代中子转换器的大面积中子探测器的开发正迅速成为当务之急。在所提出的技术中，每个网格包括30个10 B4 C层（每个1 μm厚），用于将中子转换为电离粒子，随后在正比气体计数器中检测。测试了几个原型，最大的总有效面积为8 cm x 200 cm。使用DC磁控溅射机将高达4.6 m2的10 B富集的碳化硼涂覆到铝叶片上。原型的表征表明，对于2.5 A中子，中子效率为n = 53.04%，这与MC模拟的预期一致。在较宽的能量范围内测得γ灵敏度= 5 · 10-5。还进行了长期稳定性测量。这些结果表明，这种技术作为替代3 He的位置敏感探测器的潜力。
Despite its present shortage, 3He continues to be the most common neutron converter for detectors in neutron scattering science. However, it is obvious that the development of large area neutron detectors based on alternative neutron converters is rapidly becoming a matter of urgency. In the technique presented, grids each comprising 30 10B4C layers (each 1 µm thick) are used to convert neutrons into ionising particles which are subsequently detected in proportional gas counters. Several prototypes, the largest with a total active area of 8 cm x 200 cm, were tested. Up to 4.6 m2 of 10B-enriched boron carbide were coated onto aluminium blades using a DC magnetron sputtering machine. Characterisation of the prototype showed neutron efficiency to be n = 53.04% for 2.5 A neutrons, which is in line with expectations from MC simulation. Gamma-sensitivity = 5 · 10-5 was measured for a broad range of energies. Long term stability measurements were also performed. These results demonstrate the potential of this technique as alternative to 3He-based position sensitive detectors.