DEVICE FOR FAST NEUTRONS RADIATION CANCER THERAPY

摘要

FIELD: medical equipment. ^ SUBSTANCE: invention relates to medical equipment, in particular to the devices for cancer fast neutrons radiation therapy; the device comprises the neutrons generator surrounded from above by the shield protecting from the broad beams of boronized polyethylene; the generator located against the biological shield on the same axle with the built in it neutron channel; the device is also equipped with the functional shield; the biological and functional shields are performed in the shape of adjacently placed stunned cones with a big footing from the side of the outlet aperture of the neutron channel and a smaller one - from the side of the neutrons generator; the shields are executed fungible from the same material or composite consisting of the parts in the shape of blunted cones put one inside the other, at that the parts of the biological shield and/or functional shield are made fungible or have interstratified layers; the biological and functional shields or their parts are made of metal or metal hydrides or metal alike substances or porous materials containing light nucleuses or hydric compositions; herewith the radius of the inlet aperture of the neutron channel and of the thickness of the biological and functional shields is selected on the basis of the conditions of provision of the therapeutic efficiency determined by the formula F=D/L, wherein D is the distance from the back edge of the outlet channel of the neutron channel on the surface of the shield to the point whereat the kerma counts to 20% of the kerma in the beam center, and L is the distance passed by the fast neutron without interacting with the shields materials up to the point whereat the kerma amounts to 20% of the kerma in the beam center. ^ EFFECT: application of the invention allows to enhance the operation characteristics of the device due to the creation of the optimal shaper of the radioactive fields and the requisite radiation protection of the patient. ^ 9 cl, 4 dwg.