Weighted Fuzzy Identification Of Nuclear Material’s γ Energy Spectrum Fingerprint

y spectroscopy is one of the nuclear technologies of the important technical means, it has a very wide application field, especially, it plays a important role of the field about nuclear energy application and international nuclear disarmament. The pressure of resource shortage in each country is alleviated by nuclear power, which is a kind of potential energy, and the advantages of clean and inexhaustible is possessed, it can bring an unimaginable and irreparable damage disaster to human if it is secured improperly. In order to use the nuclear power with safety, nuclear materials must be monitored; In order to maintain international disarmament and the system of arms control and enhance the international peace, security and stability, the number of nuclear weapons is slashed by the United States and Russia, which have the world’s largest nuclear Arsenal. In order to ensure the destruction of nuclear weapons is specified, the recognition rules of nuclear weapons will be identified. The technology of y energy spectrum analysis and y energy spectrum identification is very important of safety monitoring of nuclear material and the recognition of nuclear weapons. Therefore, study of recognition technology about y energy spectrum has an important practical significance.A y spectrum is unique correspondenced by each radionuclide or nuclear material, the characteristic of the y energy spectrum about a different radionuclide or nuclear material is not identical.Therefore, a "fingerprint" of radionuclide or nuclear material is seen by y energy spectrum,that is "y energy spectrum fingerprint". The analysis of nuclear materials is achieved by the analysis of the y energy spectrum. The type and activity of radionuclide can be known by analysis of the y spectrum. Due to involve military confidentiality, the analysis of the radionuclide constituent of nuclear weapons is not allowed in the process of nuclear weapons’verification, so the nuclear weapons is the designated nuclear weapon is only needed to know. Then y energy spectrum fingerprint recognition technology should be adopted. The y spectrum identification is called by adapting an appropriate numerical analysis method with higher confident coefficient to give a judgment by "yes" or "no" for two sets of y energy spectrum that whither these have the same type of fingerprint of nuclear material or individual.In this paper, a method of weighted fuzzy recognition is proposed, it realizes the identification of types and individual of y energy spectrum fingerprint. The main contents include the brief introduction of formation mechanism of y energy spectrum fingerprint, the brief introduction of collection methods of y energy spectrum fingerprint, weighted fuzzy recognition theory and identification of simulation nuclear materials’y energy spectrum.For radionuclide241Am,60Co,137Cs,22Na and152Eu and combinations γ energy spectrum fingerprints type and individual identification. The results show that this method can reduces the impact of recognition by the loss of weak peaks, to improve the recognition confidence coefficient.