Abstract
The relative neutron temperature represented by the activation ratio (AR) of Lu-Cu, and the modified epithermal index in the form were measured by foil activation for a wide range of water-to-fuel volume ratios, in slightly enriched UO2-H2O lattices. With tight lattices, the values of the activation ratio thus experimentally determined agree better with the two dimensional collision probability calculation than with the one dimensional cylindricalized cell calculation. The values of measured with the use of Au-Mn-Ni alloy foil without Cdfilter are in good agreement with the results calculated by the extended TEMPEST code. The neutron temperature Tn and the epithermal index r in a unit cell, derived from the quantities AR and , can be expressed respectively by from which, it is found that a linear relationship between is obtained in the form
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