ANSTO :: Browsing by Author "Tattersall, RB"

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Differential neutron spectrum measurements on U233/BeO and U235/BeO assemblies in the reactor MOATA.
(Australian Atomic Energy Commission, 1967-03) Tattersall, RB
Differential spectrum measurements were made on a series of U233 and U235 fuelled, beryllia moderated assemblies with fuel to moderator atomic ratios ranging from 1/6500 to 1/700. A preliminary comparison has been made with calculations of the spectra and, in the thermal region, fair agreement was found for the U235 lattices, but for U233 the experimental thermal flux was significantly higher than that calculated. In the epithermal region above 50eV, the experimental flux was higher than that calculated for the U235 assemblies, but was in reasonable agreement with calculation for U233.
Methods used to analyse experimental data obtained with the MOATA time of flight analyser.
(Australian Atomic Energy Commission, 1967-01) Tattersall, RB
The theory used to deduce a neutron energy spectrum from counting rate data recorded by the Time of Flight Analyser installed on the reactor MOATA is described in detail, included are the methods used to calculate energy resolution and slit transmission probabilities assuming either opaque or translucent slit walls. The corrections for energy resolution, dead time, background and air attenuation are also discussed.