Patent ID: 9058908
Filing Date: 2015-06-16
Classification: G21G

Abstract:
1. A target for implementing a process for producing actinium-225 and radium isotopes, the target comprising a thorium metal sample enclosed in a hermetic shell, the sample being in the form of at least one bulk thorium metal monoliths that is 2 to 30 mm thick, the hermetic shell having walls with a wall thickness on a beam inlet and outlet side in a range of 50 to 300 μm, the walls of the shell being diffusion-welded to the sample so as to provide a contact between the sample and the shell that enables improved cooling of the target with a flow of water around the walls than if the walls were not diffusion-welded to the sample, the target further comprising an electron-beam, laser, or argon-arc weld seam sealing the walls to the sample at a periphery of the target, the hermetic shell being arranged and constructed with a material that does not react either (a) with thorium under thermal and radiation loads resulting from an irradiation of the sample with protons at an energy above 40 MeV while the target is being cooled with the water flow or (b) with radiolytic water from the water flow when the target is cooled with the water flow during the irradiation, said material being selected from the group consisting of metallic niobium, nickelated molybdenum, and high-alloy austenitic steel.