FIELD: medicine.SUBSTANCE: invention relates to medical equipment. Neutron capture therapy system comprises: a neutron generation device comprising an accelerator and a target, in which a beam of charged particles generated during acceleration in an accelerator interacts with a target for generating a neutron beam, as well as a beam forming assembly. Target comprises: an active layer for interaction with a beam of charged particles for generation of a neutron beam, a support layer for supporting the active layer and a heat-dissipating layer, which includes a tubular element containing tubes located next to each other. Beam forming assembly comprises: a retarder for slowing down the neutron generated in the target to energy of the epithermal neutron energy range, a reflector enclosing the retarder, wherein the reflector directs the diverting neutron back to the retarder to increase the intensity of the epithermal neutron beam, thermal neutron absorber configured to absorb thermal neutrons in order to avoid overdose in the superficial healthy tissue during therapy, a radiation shield located in the rear part of the reflector around the output of the beam for screening of leaky neutrons and photons in order to reduce the dose for healthy tissue in the non-irradiated region, as well as the output of the beam. At that, outline of outer surface of tubular element connected to support layer or active layer has shape of arc, wherein the active layer on each tube of the tubular member covers at least 1/4 of the outer circumference of the tube. Target for particle beam generation device comprises: active layer for generation of particle beam, support layer for active layer support, and heat-dissipating layer, including tubular element containing tubes located next to each other, wherein the outline of the outer surface of the tubular element lateral part, which is connected to the support layer or the active layer, has an arc shape, wherein the active layer on each tube of th
