The Optimisation of Nuclear Parameters Used for Silicon Irradiation in the Harwell Research Reactors
Irradiations of semi-conductor silicon for the purposes of neutron doping have been carried out in DIDO and PLUTO, the materials-testing reactprs at Harwell, since 1975. The reactors are fuelled with highly enriched uranium in a core which is cooled and moderated with heavy water. At the present time irradiations are carried out in the outer graphite reflector where the neutron spectrum is well thermalised, resulting in relatively low damage rates from fast neutrons. (FIG. 1) Reactivity of the core is partly controlled by a combination of burnable poisons so that flux changes caused by the movement of control absorbers are kept to a minimum.
KeywordsPhosphorus Graphite Depression Uranium
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