Production ofNb93mby the Pile Irradiation of Niobium

Low-energy electrons and Nb $K$ x-rays, believed to be due to the decay of the isomer ${\mathrm{Nb}}^{93m}$, have been found in neutron-irradiated niobium. The electrons have energies of about 8.5 kev and 23 kev and are believed to be $K$ and $L$ conversion electrons from a 27-kev gamma ray. The half-life of the activity is about four years.