Abstract
Because of the rapid development of the technology for treating nuclear fuel, methods for the nuclearphysics monitoring of the concentration of fissionable substances are constantly being improved and restudied. Among the extremely complicated requirements for the corresponding instruments are the requirement that they not make contact with fuel; that they be controlled remotely; and that they perform analysis continuously in the presence of a high y-activity, a neutron background from spontaneously fissionable isotopes, and a background of (a, n)-reactions. These requirements limit the sensitivity of some methods and rule out others (based on y-spectrometry). We report he.re experimental measurements of U 235 concentrations in solutions by neutron irradiation from a Sb-Be source and by the detection of fast fission neutrons. The use of neutron irradiationfroma nSb -Be source was proposed in [1] for the analysis of uranium consumption in a fuel element; a thorium chamber was chosen to detect the fission neutrons. This method of measuring the U 235 content is essentially background-free since the thorium chamber is not sensitive to neutrons from the Sb-Be source or to
Published Version
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