A cryogenic source for neutron radiography using a TRIGA reactor
- General Atomic Co., San Diego, CA (United States)
A subthermal neutron radiographic facility has been established and successfully operated at General Atomic Company's TRIGA facility to interrogate materials exhibiting a Bragg edge in scattering cross section for neutrons below thermal energies. The facility makes use of the 1500 kW TRIGA Mark F as a neutron source, coupled to a moderator volume of solid methane maintained in the temperature range of 10 deg. K to 25 deg. K by a helium-cooled cryostat. A beam of subthermal neutrons (0.005 to 0.002 eV) is scattered from the solid methane through a cadmium aperture up an argon-filled stepped aluminum beam tube to an imaging system at the top of the reactor pool. The subthermal neutron radiographic facility has been used to inspect zirconium billets with a nominal diameter of 355 mm and thicknesses of 200 to 250 mm in production quantities. With an imaging system of gadolinium-phosphor screens and NDT-75 film, acceptable radiographs have been produced in times as low as 6 minutes. The requirements of the radiographic system include producing film densities of 1.3 and imaging standards of Hafnium, Tantalum and Tungsten down to 0.5mm in diameter, through the 250 mm billets. (author)
- Research Organization:
- General Atomic Co., San Diego, CA (United States)
- OSTI ID:
- 21149392
- Report Number(s):
- INIS-US-09N0119; TOC-12; TRN: US09N0138028998
- Resource Relation:
- Conference: 7. biennial U.S. TRIGA users' conference, San Diego, CA (United States), 2-5 Mar 1980; Other Information: Country of input: International Atomic Energy Agency (IAEA); Abstract on p. xxx; 1 ref, 6 figs, 1 tab; Related Information: In: 7. biennial U.S. TRIGA users' conference. Papers and abstracts, 369 pages.
- Country of Publication:
- United States
- Language:
- English
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