1988 Volume 25 Issue 11 Pages 884-888
To get information about the neutron spectrum in low enriched UO2-H2O lattices, the spectral indices SI(U8c/Dy) and SI(U8c/U5f) were measured on the basis of the parallel irradiation technique, which basically irradiates activation foils both in a neutron field to be investigated and in a reference field of thermal neutrons. In the present study, a fuel pellet of UO2 was used for the, measurement of activities caused by the neutron capture of 238U and the fission of 235U. Besides the technical details of the measurements, the origins of experimental errors are listed with the method how to eliminate them. The measurements were carried out in lattices of different fuel enrichment to demonstrate the capability of the present method, and the experimental results were compared with the calculated ones. It was found that the results of the present measurements are useful to assess the validity of the cell calculations.
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