Feasibility study on using imaging plates to estimate thermal neutron fluence in neutron-gamma mixed fields.
Feasibility study on using imaging plates to estimate thermal neutron fluence in neutron-gamma mixed fields.
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利用成像板估算中子-伽马混合场中热中子注量的可行性研究。
DOI：
10.1093/rpd/ncq493
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发表时间：
2011
影响因子：
1
通讯作者：
A. Nohtomi
中科院分区：
文献类型：
--
作者：
T. Fujibuchi;Yu Tanabe;T. Sakae;T. Terunuma;T. Isobe;H. Kawamura;K. Yasuoka;Tetsuro Matsumoto;H. Harano;J. Nishiyama;A. Masuda;A. Nohtomi
在目前的放射疗法中，当入射光子能量高于阈值时，在光核反应中产生中子。本文研究了在中子-γ射线混合场中使用成像板（IP）鉴别中子成分的方法。使用了两种类型的IP：用于β射线和γ射线的常规IP，以及用于检测中子的掺杂有Gd的IP。在混合场中辐照IP，并使用本文提出的表达式鉴别热中子分量的光致发光（PSL）强度。热中子分量的PSL强度与热中子注量成正比。当在恒定中子辐照的基础上增加额外的光子辐照时，热中子组分的PSL强度不受影响。PSL强度的不确定度约为11.4%。该方法为鉴别混合场中的中子成分提供了一种简单而有效的手段。
In current radiotherapy, neutrons are produced in a photonuclear reaction when incident photon energy is higher than the threshold. In the present study, a method of discriminating the neutron component was investigated using an imaging plate (IP) in the neutron-gamma-ray mixed field. Two types of IP were used: a conventional IP for beta- and gamma rays, and an IP doped with Gd for detecting neutrons. IPs were irradiated in the mixed field, and the photo-stimulated luminescence (PSL) intensity of the thermal neutron component was discriminated using an expression proposed herein. The PSL intensity of the thermal neutron component was proportional to thermal neutron fluence. When additional irradiation of photons was added to constant neutron irradiation, the PSL intensity of the thermal neutron component was not affected. The uncertainty of PSL intensities was approximately 11.4 %. This method provides a simple and effective means of discriminating the neutron component in a mixed field.