ИСТИНА

The invention relates to nuclear technology and radiochemistry, namely, to the production and recovery of radionuclides for medicinal purposes. The process for producing actinium-225 and radium isotopes comprises the irradiation of a bulk thorium metal monolith 2 to 30 mm thick, enclosed in an air-tight shell made of a material that does not react with thorium, with a high-intensity beam of accelerated charged particles. The irradiated metallic thorium is withdrawn from the shell and then either heated with lanthanum addition and radium sublimation, or dissolved in nitric acid and the actinium-235 is recovered by extraction. Targets for implementing the process are metallic thorium monoliths 2 to 30 mm thick enclosed into air-tight shells made of various materials that do not react with thorium.