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首页> 外文会议>INMM annual meeting >Development of a Portable Coupled Neutron-Gamma Coincidence Counter for Field Measurements of Nuclear Materials Using MCNPX and MCNPPOLIMI
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Development of a Portable Coupled Neutron-Gamma Coincidence Counter for Field Measurements of Nuclear Materials Using MCNPX and MCNPPOLIMI

机译：使用MCNPX和MCNPPOLIMI的便携式耦合中子-伽马重合计数器的开发，用于核材料的现场测量

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In previous years, advancements have been made in portable neutron coincidence counters. These detectors have the ability to quickly detect possible special nuclear materials in the field. However, the uncertainties with the measurements can quickly increase as the number of neutrons being counted simultaneously increases due to accidental neutrons being recorded. During a spontaneous fission event in a sample, coincident neutrons and coincident gamma-rays are emitted. In theory, these signals could be used together without resulting in increasing the order of the error in the result. In this task, the design of a portable coupled neutron and photon coincidence counter will be explored. With the use of MCNPX and MCNP-POLIMI, a counter can be modeled to simulate a source and count both neutrons and gammas. The detector will use multiple Helium-3 (~3He) tubes embedded in high density polyethylene to detect coincidence neutrons. It will also use multiple Lanthanum Bromide (LaBr) scintillation detectors to detect coincident gamma rays. The LaBr detector will also provide the ability to perform spectroscopy to assist in determining the isotopes present in the source. A coincident event will occur from a neutron-neutron, gamma-gamma, neutron-gamma, and gamma-neutron being detected in coincidence within a specified amount of time. These detectors can be arranged to surround the source and to provide the best geometry for the best efficiency. With these two types of detectors working in conjunction, it will provide a new method to determine possible special nuclear materials quickly and with less error in the field.
机译：在过去的几年中，便携式中子符合计数器已经取得了进步。这些探测器具有在现场迅速探测可能的特殊核材料的能力。然而，由于记录偶然的中子，同时计数的中子数量增加，因此测量的不确定性会迅速增加。在样品的自发裂变过程中，会同时发射中子和同时发射伽马射线。从理论上讲，这些信号可以一起使用，而不会导致结果误差的增加。在这项任务中，将探索便携式耦合中子和光子符合计数器的设计。通过使用MCNPX和MCNP-POLIMI，可以对计数器进行建模以模拟源并对中子和伽马值进行计数。该探测器将使用嵌入在高密度聚乙烯中的多个Helium-3（〜3He）管来探测重合中子。它还将使用多个溴化镧（LaBr）闪烁探测器来探测重合的伽马射线。 LaBr检测器还将提供执行光谱的功能，以帮助确定源中存在的同位素。在指定的时间内会同时发生中子，中子，伽马，中子和伽马中子的重合事件。这些检测器可以布置成围绕光源并提供最佳效率的最佳几何形状。通过将这两种类型的探测器配合使用，它将提供一种新的方法来快速确定可能的特殊核材料，并且在现场误差较小。

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