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Sensitivity Measurements For Cargo Scanning Applications Using Photon Interrogation and Neutron Signature Counting Techniques.

机译：使用光子询问和中子签名计数技术的货物扫描应用灵敏度测量。

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摘要

In recent years, non-destructive evaluation techniques which use either photon or neutron sources from accelerators followed by neutron counting signatures have been used in many national security and nuclear nonproliferation applications [4, 60]. Although the United States customs and border protection initiated and implemented a cargo security initiative to discover threats from others countries before they embark to the US, detectors with better sensitivities are more necessary than ever in view of the global threats faced by nations around the world. Photofission based applications which use delayed neutron signal ores as viable detection schemes for fissile material detection have been ongoing for many years. Applications of this technology to include cargo scanning applications are however lacking.;This work in this dissertation used the delayed neutron signature counting technique for fissile material detection in conjunction with new formulated Curries' expressions to establish the sensitivity (minimum detectable mass) limits. The fission reactions were induced in a uranyl nitrate solution containing 94.1 g of 238U using bremsstrahlung endpoint cue pies of 9 MeV to 21 MeV in 2 MeV steps. Preliminary data on the sensitvity measurement at bremsstrahlung end point energies of 9, 14, 18 and 22 MeV are also presented. We also present the effect of borated polyethylene and lead shielding on the sensitivity at 9 and 22 N1cV. The sensitivities were calculated for 5%u false positives and 5% fake negatives as well as for 1% false positives and 0.1% false negatives. A dose of 4 Gy, 5 mGy and 1 mGy were assumed to he delivered to Mutt cargo container. For a radiator and target-to-detector distance of 150 cm and 200 cup, the delayed neutron yield from calculation and experiment was also compared. Finally, feasibility studies was conducted to determine if the linac parameters used in this research was capable of detecting 1 mg, 1 g and 1 kg of 238U. This work was funded by a grant from FA8650-01-2-6541
机译：近年来，在许多国家安全和核不扩散应用中使用了无损评估技术，该技术使用来自加速器的光子或中子源，然后进行中子计数签名[4，60]。尽管美国海关和边境保护局发起并实施了一项货物安全计划，以在其他国家威胁美国之前就发现它们，但鉴于世界各国所面临的全球威胁，灵敏度更高的探测器比以往任何时候都更为必要。使用延迟中子信号矿石作为可裂变材料检测的可行检测方案的基于光裂变的应用已经进行了多年。然而，缺乏这项技术的应用，包括货物扫描应用。本文的工作是使用延迟中子特征计数技术对裂变材料进行检测，并结合新制定的库里斯公式来建立灵敏度（最小可检测质量）极限。在9 MeV到21 MeV的致终端终点提示下，在2 MeV的步骤中，在含有94.1 g 238U的硝酸铀酰溶液中诱发了裂变反应。还提供了在ms致辐射终点能量为9、14、18和22 MeV时灵敏度测量的初步数据。我们还介绍了硼酸化聚乙烯和铅屏蔽对9和22 N1cV灵敏度的影响。计算了5％u假阳性和5％假阴性以及1％假阳性和0.1％假阴性的敏感性。假定他已将4 Gy，5 mGy和1 mGy的剂量交付给Mutt货柜。对于辐射体和目标到检测器的距离为150 cm和200杯，还比较了计算和实验产生的延迟中子产率。最后，进行了可行性研究，以确定本研究中使用的直线加速器参数是否能够检测到1 mg，1 g和1 kg的238U。这项工作由FA8650-01-2-6541资助

著录项

  • 作者

    Ankrah, Maxwell.;

  • 作者单位

    Idaho State University.;

  • 授予单位 Idaho State University.;
  • 学科 Physics Radiation.
  • 学位 Ph.D.
  • 年度 2011
  • 页码 100 p.
  • 总页数 100
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 宗教史、宗教地理;
  • 关键词

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