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 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.
Detection of landmines by using 14MeV neutron tagged beams
LUNARDON, MARCELLO;VIESTI, GIUSEPPE;
2004
Abstract
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 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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