X-Ray Emitting Isotopes of Radioactive Sb and Sn

Three new x-ray emitting activities in Sb with half-lives of 2.8 hours, 5.1 hours and 39 hours have been found by the use of the curved crystal camera in conjunction with the x-ray decay curves. The assignments are Sb¹¹⁷, Sb¹¹⁸, and Sb¹¹⁹ respectively. All three decay by K-electron capture giving characteristic Sn x-rays. The 2.8-hour Sb¹¹⁷ also emits 0.46-Mev electrons while the 5.1-hour Sb¹¹⁸ gives 0.20-Mev electrons and 1.5-Mev gamma-rays.X-ray periods of 1.25 days and 9 days have been found in Sn. The reported decay scheme for Sn¹¹³ was verified but the 0.085-Mev gamma-ray was not found.