Radio-Active Substances

This volume unfolds a groundbreaking chapter in early twentieth‑century science, drawing on more than four years of meticulous experiments with luminous minerals and the elusive rays first noted by Henri Becquerel. The author’s inquiry began with the phosphorescence of uranium and quickly expanded into a systematic hunt for new, intensely radioactive substances, culminating in the isolation of a pure radium chloride and the proposal of radium as a distinct element.

Beyond the laboratory results, the text captures the collaborative spirit that drove the emerging field: specimens were exchanged with fellow physicists across Europe, sparking a flurry of parallel investigations and a burgeoning community of specialists. Detailed descriptions of extraction techniques, chemical analyses, and the nascent methods for measuring atomic radioactivity give listeners a vivid sense of the excitement and uncertainty that marked these early discoveries. The work remains a unique window into the formative moments of modern atomic science.