Abstract
Anode current‐voltage characteristics of gas‐filled thermionic diodes containing fission‐product krypton were compared with characteristics of the same tubes containing natural krypton. Significant increases in current were observed in the diodes when radioactive krypton was substituted for natural krypton at pressures in the range of 20–340 mm Hg. In addition, diodes containing radioactive krypton displayed negative resistance.