On the sensitivity of terahertz gyrotron based systems for remote detection of concealed radioactive materials
On the sensitivity of terahertz gyrotron based systems for remote detection of concealed radioactive materials
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基于太赫兹回旋管的隐蔽放射性物质远程探测系统的灵敏度研究
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
M. Glyavin
中科院分区：
文献类型：
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作者：
G. Nusinovich;P. Sprangle;V. E. Semenov;D. Dorozhkina;M. Glyavin
本文分析了旨在通过使用聚焦太赫兹辐射远程探测隐藏放射性物质的系统的一些特征。这一概念基于将高功率太赫兹辐射聚焦在波场超过击穿阈值的小点上的可能性。然而，在没有任何电离源的情况下，在这个易于击穿的体积中具有任何种子电子的可能性非常低。因此，一系列太赫兹脉冲的高击穿率将表明聚焦波束附近存在隐藏的放射性材料。本文的目标是使用统计理论确定可靠启动放电所需的太赫兹脉冲持续时间。然后，放射性材料的可检测质量被确定为距离以及太赫兹波功率和脉冲持续时间的函数。最后，使用脉冲压缩器可能带来的好处，它缩短了脉冲持续时间，但增加了波功率，因此增加了易于击穿的体积......
This paper analyzes some features of systems intended to remotely detect concealed radioactive materials by using a focused THz radiation. This concept is based on possibility to focus high-power THz radiation in a small spot where the wave field exceeds the breakdown threshold. However, in the absence of any sources of ionization, the probability to have in this breakdown-prone volume any seed electrons is very low. Thus, high breakdown rate in a series of THz pulses will indicate the presence of concealed radioactive materials in the vicinity of a focused wave beam. The goal of the present paper is to determine by using the statistical theory THz pulse duration required for reliable initiation of the discharge. Then, the detectable mass of the radioactive material is determined as the function of distance and of the THz wave power and pulse duration. Lastly, possible benefits from using pulse compressors, which shorten the pulse duration but increase the wave power and, hence, the breakdown-prone volume...