09-27-2021-1746 - recognised a small spike at an energy of 803 kilo-electron volts (keV) as the gamma ray signal from polonium-210

 Scientists at AWE were involved in testing for radioactive poison after the poisoning of Alexander Litvinenko. No gamma rays were detected; however, the BBC reported that a scientist at AWE, who had worked on Britain's early atomic bomb programme decades before, recognised a small spike at an energy of 803 kilo-electron volts (keV) as the gamma ray signal from polonium-210, a critical component of early nuclear bombs, which led to the correct diagnosis. Further tests using spectroscopy designed to detect alpha radiation confirmed the result.^[11]

https://en.wikipedia.org/wiki/Atomic_Weapons_Establishment