Accession Number : ADA601033


Title :   Optimization of the Army's Fast Neutron Moderator for Radiography


Corporate Author : ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ


Personal Author(s) : Zuber, Stephan C


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a601033.pdf


Report Date : 26 Feb 2013


Pagination or Media Count : 17


Abstract : Early experiments in neutron radiography have been demonstrated at the US Army Armament Research, Development, and Engineering Center (ARDEC). From the early 1970s through the 1980s, neutron imaging was done using Californium-252 (Cf-252), and showed significant potential for expansion into an NDT method that would be viable to inspect munitions and weapon systems. However, due to the inherent issues involved with the use of radioactive sources, and the high costs and numerous requirements for operating a reactor or research accelerator, little progress has been made since that time. Neutron radiography has not been widely implemented for use within the DoD, mainly due to the limitations of available neutron producing sources. Current commercially available electronic sources and generators are impractical for imaging due to low outputs, which require exposure times measured in days, not minutes, as is typical for x-ray imaging. These conditions were shown in the initial baseline experiments performed at ARDEC with a commercial source. The early tests showed promise in the method, but reinforced the need for a high-output, small-size, easy-to-use neutron source. This paper presents a more in-depth investigation into the optimization of a laboratory neutron radiographic (NR) imaging system, and its potential for nondestructive inspection directly applicable to defense components. This upgraded NR setup uses a moderator and collimator specifically designed for use with the 14.1 MeV neutrons from a deuterium-tritium (D-T) generator. The field of view (FOV) was also increased for more practical use with standard 35 cm L x 43 cm W (14 in L x 17 in W) radiographic cassettes and film. The goal of this experiment was to have increased thermal neutron flux rates and shorter exposure times than previously achieved. Additional technology developments are also underway to build state of the art neutron sources for the Army. Their intent is to bring this method into


Descriptors :   *NEUTRON RADIOGRAPHY , BANDPASS FILTERS , NEUTRON BEAMS , NEUTRON FLUX , NONDESTRUCTIVE TESTING , OFF THE SHELF EQUIPMENT , RADIOACTIVE MATERIALS


Subject Categories : Test Facilities, Equipment and Methods


Distribution Statement : APPROVED FOR PUBLIC RELEASE