Abstract
The characterisation is described of the epithermal neutron beam at the LVR-15 reactor. The epithermal neutron fluence rate at the reactor power of 10 MW was found to be 1.07 x 10 12 m -2 .s -1 , The fast neutron dose rate was 0.5 Gy.h -1 and the incident gamma dose rate 2.25 Gy.h -1 . At this beam whole-body human phantom measurements were designed with the aim of determining both the neutron and gamma dose over the whole body during the irradiation. The thermal neutron fluence rate inside the phantom along its backbone was also measured. A new therapy room for BNCT purposes has been designed to enable irradiation studies without any effect on other users of the LVR-15 reactor. The ground plot of the room has dimensions 3.5 x 2.5 m and the room height is 2 m. The beam filter has been optimised to increase the epithermal fluence rate and decrease the fast neutron dose rate. Influence of the collimator geometry, the Be reflector outside the reactor core, the material and thickness of the filter, and the U converter outside the Be reflector were studied. The calculations were performed with the codes DOT and MCNP. The so far optimal variant shows that it is possible to get an epithermal fluence rate of at least 5.92 x 10 12 m -2 .s -1 with the fast neutron dose rate of 2.92 Gy.h -1 .
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