MEASUREMENTS OF UFCb CYLINDERS WITH PORTABLE INSTRUMENTS*

Year
1973
Author(s)
L.W. Fields - Oak Ridge National Laboratory
R.B. Walton - Los Alamos Scientific Laboratory
J.L. Parker - Los Alamos Scientific Laboratory
T.D. Reilly - Los Alamos Scientific Laboratory
J.H. Menzel - Los Alamos National Laboratory
Abstract
The applicability of portable instruments for rapid nondestructive verification of the enrichment of UFg in cylinders has been tested on a large number of types 30- and 5A-cylinders. Three basic techniques were used: gamma counting with Nal combined with ultrasonic measurement of cylinder wall thickness, passive neutron counting, and active neutron interrogation with thermal neutrons from a radioactive neutron source. The resulting accuracies and limitations of the techniques are presented.