In a major step toward self-sufficiency in advanced cancer care, scientists at a premier Chinese research facility say they have the capability to produce medical isotopes known as "nuclear warheads" for their ability to destroy tumors with pinpoint accuracy. The breakthrough at the China Spallation Neutron Source in Dongguan, Guangdong province, targets a critical bottleneck in the country's healthcare system: a long-standing reliance on expensive, unstable imports of alpha isotopes.