Separate determination of gamma- and neutron fluxes in the core of working and shut-down reactor by means of quartz glass and activation monitors

One measured the neutron fluxes and the intensity of γ-radiation within 26 channels of the WWR-SM and the thermal column. The fluxes of fast neutrons within the channels were detected by means of the Ni, Fe, Co, Au, Mn element monitors varying in the threshold energy and were determined by means of the MCNP-4C program base theoretical calculation. One derived the energy distribution of the neutron fluxes within the fuel assembly for the chosen channels round the core. The density of >1 MeV energy neutron fluxes was within (0.5-43)x1012 s-1 cm-2 range depending on the channel location. One revealed the linear correlation between the induced optical absorption within 215 nm line (E'-centres) of SiO2-BaO glass and the fast neutron flux within the channels. On the basis of E'-centres induced in the pure quartz glasses one evaluated the intensity of γ-radiation within the thermal channel of the operating reactor (∼38.4 Gy/s) and in 24 hours after the shutdown (∼24.7 Gy). The observed difference in the oxygen defect formation efficiency under the dry and the wet irradiation of the glass due to the water radiolysis should be taken into account when elaborating radiation process and ensuring radwaste disposal