Recherches sur les substances radioactives

The author presents systematic laboratory investigations of spontaneous emissions from uranium compounds and the chemical isolation of intensely radioactive substances, detailing the discovery and preparation of new active elements such as radium and related fractions. She explains a radiochemical method that treats radioactivity as an intrinsic atomic tracer and reports the preparation of pure radium chloride and an estimate of its atomic weight. The narrative reconstructs experimental procedures and fractionation techniques, documents distribution of samples that enabled concurrent studies, and reviews measured physical properties while noting remaining uncertainties in interpreting complex radiative phenomena.