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放射源的辐射指纹能起到标识和鉴别放射性物体的作用 .在涉及核弹头不可逆销毁过程的深度核裁军核查中 ,核弹头的辐射指纹对标识和鉴别裁减下来的核弹头将起到关键作用 .预先研究辐射指纹的有关技术 ,如识别机理的研究 ,将有助于深度核裁军的核弹头核查技术发展 .以实验室放射源为研究对象 ,探索了类型γ射线能谱指纹的同一性识别机理 .类型γ射线指纹识别机理的研究 ,就是要找出一种合适的方法 ,以较高的置信度 ,描述两个正在进行比较的γ射线指纹是否为同一放射源的指纹 .采用了谱形比较法 ,并用谱相似度概念来描述两个指纹的相似程度 .在谱形比较思想的指导下 ,编制了放射源类型指纹识别软件 ,并通过放射源同一性的识别实验验证了软件的有效性 ,同时研究了谱相似度随统计涨落和测量条件 ,如时间、源强和本底等因素的变化情况 .研究结果表明 :1)用相似度概念来描述两个指纹的相似程度 ,回答两个待比较的γ射线能谱是否代表同一类型放射源 ,是切实可行的 ;2 )该识别机理只具备识别放射源类型的能力 ,而对同一类型、差异甚微的放射源个体还不能识别
Radiation fingerprinting of radioactive sources can serve to identify and identify radioactive objects Radiation fingerprinting of nuclear warheads plays a key role in identifying and identifying the reduced nuclear warheads in deep nuclear disarmament verification involving the irreversible destruction of nuclear warheads. Fingerprints related technologies, such as recognition mechanism, will contribute to the development of nuclear warhead nuclear verification technology for deep nuclear disarmament.Using laboratory radioactive sources as the research object, the recognition mechanism of the identity of type γ-ray energy spectrum fingerprints has been explored.The type γ-ray The research of fingerprint recognition mechanism is to find out a suitable method to describe whether the two γ-ray fingerprints being compared are the fingerprints of the same radioactive source with high confidence.The spectrum comparison method Similarity concept to describe the similarities of two fingerprints.Under the guidance of spectrum comparison thought, a software of fingerprinting type of radioactive source was compiled and the validity of the software was verified by the recognition experiment of identity of radioactive sources.At the same time, Similarity changes with statistical fluctuations and measurement conditions, such as time, source strength and background. The results show that: 1) It is practicable to use the concept of similarity to describe the similarity between two fingerprints, and to answer whether the two γ-ray spectra to be compared represent the same type of radioactive sources; 2) Type of ability, while for the same type, very different sources of radioactive individuals can not be identified