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3He gaseous detectors have been widely used for homeland security and neutron scattering applications. Due to the 3He supply crisis, different alternative thermal neutron detection techniques have been studied in recent years. And the boron coated straw tube detectors (BCSD) have been chosen as one of the potential replacements of 3He gaseous detectors for the adequate supply and large cross section...
The combination of a 3He proportional counter and a 4He proportional counter sharing the same parameters was employed as the low background thermal neutron detector. The wall material is oxygen-free copper for low surface a emit rate. Other characters including wall effect and energy resolution were also optimized for low background performance. A portable readout electronics system has been developed...
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