Spectrometer Studies of the Radiations of Some Neutron-Deficient Isotopes of Xenon and Iodine

Neutron-deficient isotopes of xenon have been produced by ($p, \mathrm{xn}$) reactions with high-energy protons on potassium iodide targets. The xenon activities were deposited on foils by the glow discharge technique and their radioactive properties were measured. Nineteen-hour ${\mathrm{Xe}}^{122}$ decays by electron capture to 3.5-minute ${\mathrm{I}}^{122}$. Gamma rays of 182 and 235 kev accompany this decay. ${\mathrm{I}}^{122}$ decays by emission of 3.12-Mev positrons. ${\mathrm{Xe}}^{123}$ decays with a 1.8-hour half-life into 13-hour ${\mathrm{I}}^{123}$. Positrons of 1.7±0.1 Mev, 150-kev gamma rays, and x-rays are associated with this decay. ${\mathrm{Xe}}^{121}$ has a half-life of 40±10 minutes for decay into 1.6-hour ${\mathrm{I}}^{121}$.