U.S. National Academies published a report of the Committee on State of Molybdenum-99 Production and Utilization and Progress Toward Eliminating Use of Highly Enriched Uranium, Molybdenum-99 for Medical Imaging. The committee was asked to assess the status of U.S. domestic and international Mo-99 production, assess progress made so far in ensuring reliable supply of medical imaging isotopes, and evaluate the effort to eliminate HEU from the Mo-99 production process.
The report noted that despite significant progress in reducing the use of HEU in the Mo-99 production chain, further "progress is being impeded by several factors, including the continued availability of molybdenum-99 produced with highly enriched uranium targets." The committee recommends that "the U.S. government and others should take additional actions to promote the wider utilization of molybdenum-99 and technetium-99m produced without the use of highly enriched uranium targets."
The National Academies also looked at the issue of HEU role in medical isotope production in the report Medical Isotope Production Without Highly Enriched Uranium, published in 2009.