In a cornfield here, past the shuttered General Motors plant, a facility not seen in the United States in three decades could soon rise: a manufacturing plant that will make a vital radioactive isotope used to detect cancer and other potentially fatal maladies in millions of people every year.

Nuclear medicine imaging, a staple of American health care since the 1970s, runs almost entirely on molybdenum-99, a radioisotope produced by nuclear fission of enriched uranium that decays so rapidly it becomes worthless within days. But moly-99, as it’s called, is created in just six government-owned nuclear research reactors — none in North America — raising concerns about the reliability of the supply and even prompting federal scientists to warn of the possibility of severe shortages.

Some 50,000 Americans each day depend on a strange and precarious supply chain easily disrupted by a variety of menaces: shipments grounded by fog in Dubai, skittish commercial airline pilots who refuse to carry radioactive material and unplanned nuclear reactor shutdowns, including one in South Africa when a mischievous baboon sneaked into a reactor hall. Read the full story here.