Lunardon M, Nebbia G, Pesente S, Viesti G, Barbui M, Cinausero M, D'Erasmo G, Palomba M, Pantaleo A, Filippini V
Dipartimento di Fisica, dell' Università di Padova, INFN Sezione di Padova, Via Marzolo 8, Padova I-35131, Italy.
Appl Radiat Isot. 2004 Jul;61(1):43-9. doi: 10.1016/j.apradiso.2004.02.015.
A large-area scanning system using 14 MeV 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 100 cm(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.
一个使用14兆电子伏特标记中子的大面积扫描系统已建成。在D+T反应中发射的相关（4）He粒子在一组平行板雪崩计数器中被检测到，这些计数器定义了一个面积约为10×100平方厘米的扫描平面。符合的伽马射线由10个BaF(2)闪烁体检测。展示了该系统确定样品的存在和位置以及进行在线背景扣除的能力。还报告了地雷测试情况。该技术在搜索隐藏威胁材料时能显著提高信噪比。预计可与便携式密封管发生器配合使用。
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