Measurements of UF6 cylinders with portable instruments
Journal Article
·
· Nucl. Technol., v. 21, no. 2, pp. 133-148
OSTI ID:4339820
The applicability of portable instruments for rapid nondestructive verification of the enrichment of UF/sub 6/ in cylinders has been tested on a large number of Types-30 and -5A cylinders. Three basic techniques were used: (1) gamma-ray counting with NaI, combined with ultrasonic measurement of cylinder wall thickness, (2) passiveneutron counting, and (3) active-neutron interrogation with thermal neutrons from a radioactive neutron source. The accuracy of the gamma-ray method was approximates 5% for Type-30 cylinders of UF/sub 6/ and 2% for highly enriched UF/sub 6/ in Type-5A cylinders; however, the method occasionally failed for Type-30 cylinders because of background from nonvolatile daughters of /sup 238/U plated on the cylinder walls. The standard deviation of enrichments of 110 Type-30 cylinders, derived from passive-neutron counting data by assuming a constant /sup 235/U//sup 234/U ratio, is 6%. The response of the active system increases almost linearly with enrichment up to approximates 2.5% / sup 235/U and then saturates at approximates 4%. (auth)
- Research Organization:
- Los Alamos Scientific Lab., NM
- NSA Number:
- NSA-29-019018
- OSTI ID:
- 4339820
- Journal Information:
- Nucl. Technol., v. 21, no. 2, pp. 133-148, Journal Name: Nucl. Technol., v. 21, no. 2, pp. 133-148; ISSN NUTYB
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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