Radiations from Radioactive Gold, Tungsten, and Dysprosium

Abstract

Level schemes are deduced for gold and tungsten from the measurement of beta-gamma and gamma-gamma coincidences, together with a knowledge of the energies of the various radiations emitted. The beta-ray spectrum of ${\mathrm{Au}}^{198}$ is simple with an end-point of 0.78 Mev. The residual nucleus emits two gamma-rays in cascade. ${\mathrm{W}}^{187}$ has a complex beta-ray spectrum. The high energy group has a maximum energy of 1.4 Mev while the one of lower energy has an end-point of 0.5 Mev and is followed by a 0.9 Mev gamma-ray and some other gamma-rays which give gamma-gamma coincidences. The dysprosium beta-ray end-point is 1.2 Mev and the maximum energy gamma-ray is 1.1 Mev.