PHOTONEUTRON SOURCE Russian patent published in 2017 - IPC G21G4/02 

FIELD: physics.

SUBSTANCE: photoneutron source includes a channel for introducing an electron beam irradiated by an electron beam with an energy of 6-8 MeV, e-γ-converter of tungsten with a thickness of 0.1 cm, two photoneutron targets from beryllium, a cavity for sample irradiation, a fast neutron retarder from polyethylene, and biological protection from borated polyethylene to absorb thermal and slow and absorb fast neutrons emitted from the source. In biological protection, a cavity filled with a moderator is made. In the centre of the moderator, a cavity is also made, in which the first and the second photoneutron targets are symmetrically positioned relative to its centre. The space between the targets serves as a cavity for irradiating the samples. On the outer surface of the first photoneutron target, an e-γ-converter is located, which is coupled with a channel for the input of an electron beam. On the sides of the cavity, side photoneutron targets of beryllium with a thickness of, at least, 1 cm can be additionally located. The photoneutron source further comprises a channel for placing the samples inside the cavity to irradiate the samples and a channel for withdrawing neutrons from the centre of the source, wherein the first and the second photoneutron targets are movable with the ability to move to the centre of the source.

EFFECT: simplification of the design and technology of manufacturing a photoneutron source, increasing the efficiency and reliability of its operation, increasing the protection against neutron irradiation during operation.

16 cl, 7 dwg, 3 ex