Helsinki Institute of Physics, Helsinki, Finland.
JHV Physics, Riihimäki, Finland.
PLoS One. 2017 Dec 6;12(12):e0188959. doi: 10.1371/journal.pone.0188959. eCollection 2017.
The most common explosives can be uniquely identified by measuring the elemental H/N ratio with a precision better than 10%. Monte Carlo simulations were used to design two variants of a new prompt gamma neutron activation instrument that can achieve this precision. The instrument features an intense pulsed neutron generator with precise timing. Measuring the hydrogen peak from the target explosive is especially challenging because the instrument itself contains hydrogen, which is needed for neutron moderation and shielding. By iterative design optimization, the fraction of the hydrogen peak counts coming from the explosive under interrogation increased from [Formula: see text]% to [Formula: see text]% (statistical only) for the benchmark design. In the optimized design variants, the hydrogen signal from a high-explosive shell can be measured to a statistics-only precision better than 1% in less than 30 minutes for an average neutron production yield of 109 n/s.
最常见的爆炸物可以通过测量元素 H/N 比来进行独特识别，精度优于 10%。蒙特卡罗模拟被用于设计两种新的瞬发伽马中子激活仪器变体，以实现这种精度。该仪器具有精确定时的强脉冲中子发生器。测量来自目标爆炸物的氢峰特别具有挑战性，因为仪器本身含有用于中子减速和屏蔽的氢。通过迭代设计优化，对于基准设计，来自被询问爆炸物的氢峰计数的分数从[公式：请参见文本]%增加到[公式：请参见文本]%（仅统计）。在优化设计变体中，对于平均中子产率为 109 n/s 的情况，可以在不到 30 分钟的时间内以仅统计精度优于 1%的方式测量高爆炸药弹壳的氢信号。
