Nitrogen detection in bulk samples using a D-D reaction-based portable neutron generator

摘要

A D-D portable neutron generator-based PGNAA setup is designed and tested for nitrogen concentration measurements in bulk samples. The PGNAA set up response was tested through 2.50 MeV and 2.52 MeV nitrogen prompt gamma ray yield measurements and indicates that the excellent performance of the portable neutron generator-based PGNAA setup can be used for detection of elements with low thermal neutron capture cross-section.

主权项

1. A bulk nitrogen detector for analysis of nitrogen by prompt gamma-ray neutron activation, comprising:
a sample cavity, a portable D-D neutron generator having neutron tube, a polyolefin moderator; a BGO gamma ray detector; and a neutron shield; wherein the polyolefin moderator is positioned between the sample cavity and the neutron generator, the BGO gamma ray detector is positioned orthogonally to the axis of the neutron tube on the sample cavity side of the polyolefin moderator, and the neutron shield surrounds the BGO detector, and wherein the polyolefin moderator further comprises a cylindrical slab positioned between the portable neutron generator and the sample; or the polyolefin moderator is a cylinder which encloses the sample cavity and is positioned adjacent to a high density polyethylene slab which is between the portable neutron generator and the cylinder; or the polyolefin moderator is a high density polyethylene moderator cylinder which encloses the sample and is configured adjacent to the neutron generator.