Promethium is commercially real in 2025, but only as a tiny isotope business centered on Pm-147. Customers do not buy promethium metal by the tonne; they buy curie quantities of a radioactive chloride or nitrate salt from the DOE isotope catalog. The isotope's demand is tied to its behavior as a low-energy beta emitter, which is why official DOE and ORNL sources consistently frame the market around thickness gauges, compact nuclear batteries and other long-lived low-power devices, luminous products, and a handful of specialized imaging uses.

The supply chain is reactor and hot-cell infrastructure, not mining. DOE's initial commercial batches came from recovery of Pm-147 from a plutonium-program waste stream after international disruptions hit the prior Russia-centered supply route. In parallel, ORNL has developed a direct HFIR route using enriched Nd-146 targets that decay through Nd-147 to Pm-147 before chemical purification. By 2025 DOE described itself as the only global producer of Pm-147, underscoring how concentrated and policy-shaped this market is.