CYCLOTRON TARGET FOR RADIONUCLIDES the internal beam CYCLOTRON

摘要

The invention relates to the structure of the cyclotron targets for the production of radionuclides by irradiation with relevant materials on the internal beam of the cyclotron. The cyclotron target consists of a copper substrate to the inner surface, cooled with running water, and the irradiated material disposed on the outer surface of the substrate. The outer surface of the target substrate is made concave toward the inner surface of the substrate, wherein the radius of curvature of the outer surface of the substrate corresponding to the radius of the orbit final internal cyclotron beam. The internal water-cooled surface of a substrate provided with ribs, the upper part of which forms a convex surface, whose shape is similar to the shape of the outer surface of the substrate. Preferably, the width of the ribs is from 0.8 to 1.2 mm, the height of the ribs is 2.0 to 6.0 mm and the distance between the edges - between 0.5 and 1.0 mm. Reduced power density incident on the target to the proton beam is achieved by making the outer concave surface of the target in the horizontal direction with the above radius, which provides the same angle of incidence of the proton beam on the irradiated surface and a uniform distribution of the beam on the target surface. Improving cooling efficiency of the target is achieved by the presence of small ribs on the inner surface of the target, which significantly increases heat transfer coefficient by increasing the heat-transfer surface. As a result, low-temperature top portions of the ribs and the inner convex surface of the substrate significantly increases the strength of the target pressure of the cooling water and the shape of the irradiated surface is maintained. 1 n.p.f. 1 z.p.f. 3 FIG.