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    • 5. 发明授权
    • Detection of nitrogen in explosives
    • 爆炸物中氮的检测
    • US4851687A
    • 1989-07-25
    • US002788
    • 1987-01-13
    • Kamil V. EttingerJoseph H. Brondo, Jr.
    • Kamil V. EttingerJoseph H. Brondo, Jr.
    • G01V5/00
    • G01V5/0069
    • An apparatus and method for scanning an object for nitrogen for detecting the presence of explosives in luggage, parcels and the like. The object is placed in a cavity in which a thermal neutron flux is produced by introducing fast neutrons in the presence of a nuclear moderating material. A reaction between the thermal neutrons and the nitrogen contained in the object causes gamma rays to be emitted which are detected and transmitted to processing electronics to determine the concentration and position of nitrogen in the object. Thermal neutrons sensors are located within the cavity to monitor the amount of thermal neutrons and adjust the thermal neutron flux within the cavity in order to maintain an optimal thermal neutron flux density within the cavity. The adjustment may be effectuated by adjusting the accelerating potential of a neutron accelerator or by adjusting the position of a neutron moderator for use with an isotopic neutron source.
    • 一种用于扫描物体用于检测行李,包裹等中的爆炸物的存在的装置和方法。 该物体被放置在其中通过在存在核调节材料的情况下引入快中子而产生热中子通量的空腔中。 热中子和物体中所含的氮之间的反应引起伽马射线的发射,这些伽马射线被检测并传输到处理电子装置,以确定物体中氮的浓度和位置。 热中子传感器位于腔内以监测热中子的量并调节空腔内的热中子通量,以便保持腔内的最佳热中子通量密度。 可以通过调节中子加速器的加速电位或通过调节与同位素中子源一起使用的中子调节剂的位置来实现调节。