RADIOISOTOPE STRONTIUM-89 PRODUCTION PROCESS Russian patent published in 2000 - IPC

FIELD: medicine. SUBSTANCE: process includes irradiation of liquid-salt nuclear fuel which is, essentially, melt of fluorine salts incorporating fissionable material, in nuclear physics unit such as nuclear reactor followed by removal of target radioisotope from fuel. Fission fragments are produced due to irradiation by neutrons in liquid-salt fuel; one of these fragments, krypton-89, being precursor of strontium-89 in fragment-disintegration chain with atomic mass 89, is removed from melt by means of bubbling with inert gas. Then gas flow is conveyed to pre-cooling system wherein krypton-89 is cleaned from accompanying krypton-90 due to natural disintegration of the latter resulting in long-living radioisotope strontium- 90. Krypton-89 is passed to trapping system wherein it is held till complete disintegration to target radioisotope. Radioisotope strontium-89 settled down in trapping system is sent for radiochemical cleaning to obtain target radioisotope of desired quality. Strontium-89 produced in the process is distinguished by high activity and radioisotope purity. EFFECT: improved capacity of process using research reactors with thermal spectrum of neutrons. 4 cl, 3 ex