Description: View of Joachimsthal, Europe's only source of uranium pitchblende. Underground mining scenes. Sorting and purification of ore containing radium, and chemical processes to crystallise radium. Changing properties of the element, with diagrammatic representation of alpha, beta and gamma rays and their reaction to a magnetic field. Explanation of half-life and disintegration and transformation of radium into other products. Effect of radium on living organisms and its use in the treatment of cancer. Presence of radioactive particles in water and different forms of curative treatment at a spa. Hazards of handling radium. View of the National Radium Institute. Measurement of radium content with a Geiger counter, also used to detect the presence of radioactive ores. Practical demonstration of this function in a laboratory, where a hidden tube containing radium is rapidly located.
