Molybdenum-99 is the precursor of the short-lived radioactive isotope technetium-99m, which is widely used in nuclear medicine for imaging diagnostics. Currently in short supply worldwide, most 99Mo — a by-product of nuclear fission — is produced in four reactors, located in Belgium, the Netherlands, Australia and Poland. It is usually transported to hospitals by air, so deliveries have been delayed during the COVID-19 pandemic. Local, resilient and unbreakable supply chains are urgently needed.
The authors declare no competing interests.