Freely combined low enriched uranium foil target with multiple single pieces

Abstract

The invention belongs to the technical field of radioactive substance preparation, and relates to a freely combined low enriched uranium foil target with multiple single pieces. The freely combined low enriched uranium foil target is used for producing fission <99> Mo by means of irradiation. The freely combined low enriched uranium foil target comprises a target barrel, low enriched uranium foils, a target core plug, a pressure plug and sealing covers. The target core plug is placed in the hollow target barrel, so that the multiple pieces of freely combined low enriched uranium foils can be compressed between the inner wall of the target barrel and the target core plug; the target core plug is compressed by the pressure plug in the target barrel from the upper side of the target core plug; two ends of the target barrel are sealed by the sealing covers by means of welding. The freely combined low enriched uranium foil target with the multiple single pieces has the advantages that processes for preparing the freely combined low enriched uranium foil target can be simplified, the irradiation efficiency can be improved, self-shielding can be reduced, the freely combined low enriched uranium foil target is safe in reactor irradiation periods and is easy to release in follow-up procedures, and the quality of the produced <99> Mo can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of radioactive material preparation, and relates to a multi-single-sheet freely combined low-enriched uranium foil target. Background technique [0002] 99m Tc is the most widely used radioactive diagnostic nuclide in modern nuclear medicine, which is generally made of artificial radionuclide 99 Mo decays to a half-life of 66h. Production 99 The main route of Mo is reactor irradiation 235 After U is produced by fission reaction 99 Mo and other products, of which 99 Mo accounts for 6.1% (mass percentage) of fission products. Uranium target ( 235 U) After entering the pile, a fission reaction will occur under the action of thermal neutrons, and the reaction cross section is 586b. The fission reaction equation is: [0003] 235 U+n→ 236 U+ 99 Mo+ 134 Sn+3n [0004] Using highly enriched uranium (HEU, 235 U mass percentage content more than 90%) large-scale production fission 99 Mo is the current ...

AI Technical Summary

Problems solved by technology

At present, the highly enriched uranium targets used in the world are basically aluminum-clad targets. If the low-enriched uranium targets are made in the form of high-enriched uranium target dispersions or alloys, the volume of the targets will increase a lot. Irradiation, target transportation, and target preparation and solution technology have caused great difficulties, which have a great impact on ensuring 99 The yield and purity of Mo pose great challenges

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