42 U.S.C. § 2142: Domestic medical isotope production

there is no alternative medical isotope production target that can be used in that reactor; and the proposed recipient of the medical isotope production target has provided assurances that, whenever an alternative medical isotope production target can be used in that reactor, it will use that alternative in lieu of highly enriched uranium; and the Secretary of Energy has certified that the United States Government is actively supporting the development of an alternative medical isotope production target that can be used in that reactor. the term “alternative medical isotope production target” means a nuclear reactor target which is enriched to less than 20 percent of the isotope U–235; the target has been qualified by the Reduced Enrichment Research and Test Reactor Program of the Department of Energy; and use of the target will permit the large majority of ongoing and planned experiments and medical isotope production to be conducted in the reactor without a large percentage increase in the total cost of operating the reactor; the term “highly enriched uranium” means uranium enriched to 20 percent or more in the isotope U–235; and the term “medical isotope” includes molybdenum-99, iodine-131, xenon-133, and other radioactive materials used to produce a radiopharmaceutical for diagnostic or therapeutic procedures or for research and development.