Uranium foil target member of low enriched uranium for irradiation production fission <99>Mo

Abstract

The invention belongs to the technical field of target member preparation and discloses a uranium foil target member of low enriched uranium for irradiation production fission <99>Mo. The target member is of a sandwich-type structure and comprises an inner target cylinder, an outer target cylinder and uranium foil. The uranium foil is positioned between the inner target cylinder and the outer target cylinder. The internal diameter of the inner target cylinder is unchanged, the outer wall of the inner target cylinder is designed into a tapered structure with the conicity of 1:160. The uranium foil wraps the outer side of the inner target cylinder. The thickness of the uranium foil is 120-150[mu]m, the inner and outer surfaces of the uranium foil are plated with a fission recoil protection layer respectively, and the thickness of the protection layer is 12-18[mu]m. The outer diameter of the outer target cylinder is unchanged, the inner wall of the outer target cylinder is designed into a tapered structure, and the inner diameter and the inner wall conicity of the outer target cylinder are matched with the outer diameter and the outer wall conicity of the inner target cylinder respectively. The uranium foil target member has the beneficial effects that the target unbinding and melting is simple, the radiation efficiency is high and the radioactivity pollution can be reduced.

Description

technical field [0001] The invention belongs to the technical field of target preparation, and in particular relates to a fission 99 Mo's LEU uranium foil target. Background technique [0002] 99m Tc drug is the most widely used radiodiagnostic drug in modern nuclear medicine. The nuclide is generally made of artificial radionuclide 99 Mo decays to a half-life of 66h. Production 99 There are various pathways for Mo, but the main pathway is reactor irradiation 235 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] Large-scale production of fission using highly enriched uranium (HEU) 99 Mo is the current global 99 The main source of Mo, the co...

AI Technical Summary

Problems solved by technology

[0005] Production Fission of Low Enriched Uranium Targets and High Enriched Uranium Targets 99 The main difference between Mo is that if the same amount of 99 Mo, the content of uranium in the low-enriched uranium target is 5-6 times that of the high-enriched uranium target; the fission products of the low-enriched uranium target 239 The Pu content increases by 20-30 times, and the aluminum content also increases greatly. 99 The yield and purity of Mo pose great challenges

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