In this paper , by neutron radiation detection with the passive method , the study on detectability , neutron spectra , etc . for the plutonium combined systems including the stimulated nuclear warhead assembly are introduced 摘要介绍了通过探测中子辐射，用被动方法研究了包括模拟核弹头装置在内的各杯组合系统的可探测性和中子能谱等内容。
If using the natural uranium to replace the heu pit in warhead , the delayed neutron counting rate would be about 3 times lower . the coincidence neutron detection is proposed to be used in nuclear warhead detection 计算表明用天然铀替代高浓铀作的假弹头，它们的出壳缓发中子数相差约3倍，需在一定条件下，才可对真伪核弹头做出判断。
Forget nuclear warheads to stop a crash with a comet that could have cataclysmic effects such as the one that is believed to have triggered the demise of the dinosaurs , hermann burchard of oklahoma state university told new scientist magazine 俄克拉荷马州立大学的赫尔曼-伯恰德对新科学家杂志说，别想用核弹头去阻止同彗星的碰撞，那样做的后果会跟据信使恐龙绝灭的那次灾难差不多。
Detecting nuclear warhead by counting delayed neutrons induced by neutron source is studied . the 2 - step calculation method is proposed to resolve the delayed neutron transportation issue . this method can save computer ' s calculation time , and is easy to operate 本文研究了用外中子源照射核弹头，诱发其裂变材料裂变，探测缓发中子的方法，以此判断高浓铀与低浓铀，从而为核查核弹头的真伪提供依据。
In numeral simulation of passive neutron detection , it is proposed to use the iterative calculation in analyzing the neutron multiplication in nuclear warhead . on this basis , the mass of the plutonium pit could be obtained under some conditions 在被动中子探测数值模拟中，提出在确定了核弹头的泄漏中子计数后，采用迭代方法计算中子在核弹头模型中的增殖，由此在一定条件下可实施核弹头质量属性的反演。
With the outer neutron source which can only induce 235u fission , it could possibly prove the presence of heu in a warhead by counting the coincidence neutrons . this method possibly provides one of necessary attributions in identifying the real nuclear warheads 本文研究了用中子符合探测方式测量能量低于1mev的外中子源在核弹头中诱发的裂变数，以判别模型中是否含有高浓铀，从而作为判断核弹头的真伪的可行性。
The method of numeral simulating the coincidence neutron detection is proposed with combining the neutron transportation and probabilistic calculation . the method is introduced and used to simulate the nuclear warhead induced fission by source neutrons with energy below 1 mev 推导并提出用中子输运计算与概率方法结合计算符合中子计数，对能量低于1mev的外源中子照射核弹头诱发裂变的符合中子测量作了数值模拟。
In this thesis , the numeral simulation studies are performed on the measurement of neutrons and gamma rays of some typical hypothetical nuclear warhead models . the feasibility of the measurements is studied , the situations that these measurements possibly can be applied are discussed , and the application conditions of these measurements are explored 本论文从核弹头的中子探测和射线探测两个方面对几种典型结构的核弹头探测的方法进行了理论研究和数值模拟，论证其探测方法的可行性，讨论了其适用范围和限制条件。
The results show that coincidence detection method has obvious benefit in detecting nuclear warheads . for the same type warhead , the coincidence counts rates of the model of warhead of heu pit is 10 times as big as that of fake warhead of natural uranium pit . if we know the nuclear warheads configuration by other methods , the method of coincidence neutron detection could be used to distinguis h the fake nuclear warheads from the reals 计算表明用探测符合中子的方法探测核弹头对区分真假核弹头有明显的优点，对于同一核弹头模型，裂变弹芯是高浓铀和用天然铀替代高浓铀时，符合中子计数相差1个量级，如通过其他途径了解核弹头的大致结构，符合测量的方法就可以有较高的置信度分辨真假核弹头。
