Radiation from Antimony 122

Abstract

Neutron capture in enriched ${\mathrm{Sb}}^{121}$ yields radioactive ${\mathrm{Sb}}^{122}$ whose half-life is found to be 66.0±0.4 hr. In addition to the two previously observed gamma rays, present studies with scintillation and conversion electron spectrometers indicate the existence of six previously unreported gammas. The energies are 95, 553, 566, 616, 647, 694, 1100, 1200 kev with possibly something at 1.9 Mev. $\frac{K}{L}$ intensity ratios for the conversion lines are observed only for the 553- and 566-kev gammas. The high-energy lines are observed only with the scintillation spectrometer. The beta spectrum is resolved into components with maximum energies at 2.00±0.03, 1.40±0.02, and 0.450 Mev, with possibly some other lower energy present.