抄録
Effect of radiation on the starting potential was studied experimentally on various low presseur Ar-Hg discharge tubes with hot cathode.
At the optimum argon presseur (about 4 mmHg) and wall temperature (40_??_80°C), remarkable rising of starting potential by faint u. v. ray and visible light was observed.
When the intensity of irradiation is stronger than a certain value, the starting potential V_??_r gives somewhat a statnrated constant voltage (V_??_r)_??_at. Regardless of the kind of light source, strong irradiations by such as incandescent lamp, Ne lamp and Ar light give the same (V_??_r)_??_at as by Hg light.
