The Internal Conversion Electrons of Several Short-Lived Neutron Induced Radioactivities

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Abstract
Accurate values of the transition energy were measured for seven neutron-induced radioactivities using a permanent magnet beta-ray spectrograph. A special vacuum gate permitted the introduction of short-lived samples within twelve seconds after the end of bombardment without disturbing the vacuum in the spectrograph. Transition energies, accurate to about one percent, were determined as follows: cesium (3 hr.) 128.0 kev, cobalt (10.7 min.) 58.9 kev, columbium (6.6 min.) 41.5 kev, dysprosium (1.3 min.) 109.0 kev, dysprosium (2.6 hr.) 87.8 kev, iridium (1.5 min.) 57.4 kev, thulium (120 day) 84.8 kev. For the five isomeric transitions, approximate values of the relative intensities of the electron lines were determined, and an assignment was made of the multipole order of the radiation, assuming electric multipole radiation.