Technology for Fissionable Materials Detection by Use 100 MeV Variable Linac

The technology for detection of hidden fissionable material by use pulse -quantum flux generated by high energy (up to 100 MeV) electron linac is discussed. The technology is based on delayed neutron detection. The results of the calculation of neutron yield from the shelter model with hidden²³⁵U inside are presented for concept background. The simulation of electromagnetic interaction with matter was performed by use GEANT. The diffusion approach was developed for description of neutron production and penetration. Calculations were made for one-dimensional model with three-zone composition of²³⁵U and⁵⁶Fe. Space-time distribution of neutron fluxes inside shelter, which is irradiated by external -source, are presented.