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首页> 外文期刊>Nuclear instruments and methods in physics research >Design of an electron-accelerator-driven compact neutron source for non-destructive assay
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Design of an electron-accelerator-driven compact neutron source for non-destructive assay

机译：电子加速器驱动的紧凑中子源的无损检测设计

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摘要

The threat of nuclear and radiological terrorism remains one of the greatest challenges to international security, and the threat is constantly evolving. In order to prevent nuclear terrorism, it is important to avoid unlawful import of nuclear materials, such as uranium and plutonium. Development of technologies for non-destructive measurement, detection and recognition of nuclear materials is essential for control at national borders. At Tokyo Institute of Technology, a compact neutron source system driven by an electron-accelerator has been designed for non-destructive assay (NDA). This system is composed of a combination of an S-band (2.856 GHz) RF-gun, a tungsten target to produce photons by bremsstrahlung, a beryllium target, which is suitable for use in generating neutrons because of the low threshold energy of photonuclear reactions, and a moderator to thermalize the fast neutrons. The advantage of this system can accelerate a short pulse beam with a pulse width less than 1 μs which is difficult to produce by neutron generators. The amounts of photons and neutron produced by electron beams were simulated using the Monte Carlo simulation code PHITS 2.82. When the RF-gun is operated with an average electron beam current of 0.1 mA, it is expected that the neutron intensities are 1.19 × 10~9 n/s and 9.94 × 10~9 n/s for incident electron beam energies of 5 MeV and 10 MeV, respectively.
机译：核恐怖主义和放射性恐怖主义的威胁仍然是对国际安全的最大挑战之一，而且这种威胁正在不断发展。为了防止核恐怖主义，重要的是避免非法进口铀和p等核材料。核材料无损测量，检测和识别技术的发展对于国界控制至关重要。在东京工业大学，已经设计了一种由电子加速器驱动的紧凑型中子源系统，用于无损检测（NDA）。该系统由S波段（2.856 GHz）射频枪组合而成，这是一种钨靶，用于通过铍靶标ms致辐射产生光子，由于光核反应的阈值能量低，适合用于产生中子，还有一个使快中子热化的减速器。该系统的优点是可以加速脉冲宽度小于1μs的短脉冲束，这是中子发生器难以产生的。电子束产生的光子和中子的数量使用蒙特卡罗模拟代码PHITS 2.82进行模拟。当射频电子枪以平均0.1mA的电子束电流运行时，对于5MeV的入射电子束能量，预期中子强度为1.19×10〜9n / s和9.94×10〜9n / s和10MeV。

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