Improved images in 14. 5 MeV neutron radiography
The direct exposure and copper transfer methods of 14.5 MeV neutron radiography were investigated. The source of neutrons was the Texas-Nuclear Model 9505 neutron generator at the Nuclear Weapons Effects Laboratory at White Sands Missile Range (WSMR). The best radiographic contrast was obtained with the direct exposure method using Kodak Type AA Industrial X-ray film with calcium tungstate screens. The contrast sensitivity thus obtained appeared to be several times better than had been observed by earlier workers. Also, image sharpness was such that threads on bolts were clearly visible. Appreciable detail was observable in a variety of objects behind 20 cm of polyethylene. One mm diameter pins on an electronic tube were visible behind 9 cm of lead. Also, various objects were visible in a 16 mm slot in a 14 cm thick polyethylene block in front of which had been placed a 9 mm thick steel plate. This latter observation suggests using the technique for nondestructive testing of such objects as warheads and rocket motors up to several in. thick. Evidence is presented to show that the images were produced primarily by 14.5 MeV neutrons with only small, if any, contributions from gamma rays and thermal neutrons.
- Research Organization:
- New Mexico State Univ., Los Cruces
- OSTI ID:
- 5446571
- Journal Information:
- Mater. Eval.; (United States), Vol. 35:4
- Country of Publication:
- United States
- Language:
- English
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ELEMENTARY PARTICLES
FERMIONS
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420500* - Engineering- Materials Testing