Year
2015
Abstract
This paper describes the successful application of a3He free neutron detection technology to meet a range of challenging problems posed by the requirements of Homeland Security, Nuclear Safeguards and Health Physics. These applications embrace the need to detect the presence of a neutron source in a cargo container passing through a portal at 25km/hr using large area detectors and extends to a miniature version embodied within the handle of a light-weight hand-held isotope- identifier (Radseeker). The technique has also been applied within a range of very sensitive search instruments that includes both backpacks and a ‘neutron vest’ that provides sufficient directional information to guide the wearer towards the source of radiation. Yet another embodiment of the technology is currently undergoing evaluation for application in a lighter weight broad-band neutron dosimeter based on the use of a more compact Bonner Sphere. The application of this technology in nuclear safeguards coincidence counting has also proven its viability beyond gross neutron counting. The paper will not only provide a description of the technology but also the results of independent evaluations of the effectiveness of the technology in a variety of applications.