A large-area scanning system using 14MeV tagged neutrons has been built. The associated (4)He particles emitted in the D+T reaction are detected in an array of Parallel Plate Avalanche Counters that defines a scanning plane having about 10 x 100cm(2) area. Coincident gamma-rays are detected by 10 BaF(2) scintillators. The capability of the system to determine the presence and the position of samples and to perform an on-line background subtraction is demonstrated. Test with landmines are also reported. This technique allows a significant improvement of the signal-to-noise ratio searching for hidden threat materials. The use with portable sealed-tube generators is foreseen.
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机译：已经建立了使用14MeV标记中子的大面积扫描系统。在平行板雪崩计数器阵列中检测到在D + T反应中发出的相关（4）He粒子，该阵列定义了约10 x 100cm（2）面积的扫描平面。巧合的伽玛射线由10个BaF（2）闪烁体检测到。演示了该系统确定样品的存在和位置以及执行在线背景扣除的功能。还报道了对地雷的测试。此技术可以显着提高搜索隐患材料的信噪比。预计将与便携式密封管发生器一起使用。
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