Abstract
For the removal of radon from liquids, simplified apparatus, including a special reflux condenser, free from carry‐over difficulties, is described. For the measurement of small quantities of radon or thoron, cylindrical ionization chambers, with moisture proof insulation, together with a removable head, evacuated, bifilar electrometer are described. The importance of constancy of the background ionization due to cosmic and local radiation is emphasized, and precautions are described which insure a highly constant background in the present type of apparatus.