II. An experimental determination of the rate of decay of the short-life product radium C?

Abstract

1. RaC′ has been observed in an isolated state, the emission of α-particles having been observed under such circumstances that the α-particles cannot be due to any other substance. 2. For the transformation constant X of RaC′ is found log₁₀λ= 5·9, a value which, by a comparison with the other products of the Uranimn-Radium sequence, suggests a modification of the Geiger-Nuttall fornlula. The experiments were carried out at the Institute of Theoretical Physics with material from the Medical Radium Institute. The author wishes to express his thanks to the Managing Board and to Professor Bohr for the facilities afforded.