This curious apparatus, called radonator, was supposed in the years 1920-1930 to allow radon to circulate in the bath water and provide the young woman with all the supposed benefits of radiation. At the time of the photograph, the radium from which radon can be extracted was so rare and so expensive that fake powders and balms were often used in its stead. At the time, radon was highly valued for its radioactive properties.
Musée Curie