Optimal scheme for stimulating photofission of shielded nuclear materials on the Microtron M-30: a combination of theoretical and experimental studies

Relevance. The photofission of shielded nuclear materials is widely used to develop methods for non-destructive analysis their isotopic composition. To stimulate the reaction, bremsstrahlung beams obtained on electronic accelerators are used. Their parameters significantly depend design features and sample activation schemes. Purpose. Theoretical modelling an optimal scheme stimulating accelerator – Microtron M-30 composition, considering its technical characteristics, experimental verification parameters. Methodology. calculations were carried out using GEANT4 toolkit. For studies influence structural elements stimulation integral characteristics inhibitory photons, secondary photoneutrons, method detectors made gold was used; residual electrons transmission based a passage chamber Faraday cylinder. Results. As result combination theoretical studies, have been established. provides conditions under which losses photon interacting with test samples (with energies ≥6 MeV) do not exceed 35% initial values, practical absence (98% absorbed) photoneutrons (no more than 1E-9 n/e). Conclusions. developed can be applied various types accelerators, features, samples, implemented schemes