Einzelnachweis von Elektronen (15 bis 50 keV) in Kernphotoplatten

Nuclear track emulsions (Ilford G 5) were used for counting of single slow electrons. They had to be accelerated by high voltage of about 30 kV and were incident vertically. The pulsed electron-beam was measured in a cage, single pulses were shot on the emulsion. The developed plates were photographed under the microscope and the tracks counted on the enlarged copies. The results are: about 40% of incoming electrons can be found as tracks in the emulsions. This number varies between different emulsions (of same type G 5), within one plate the number of tracks is better proportional to the number of electrons than between different plates. With a counting resultx one may expect the true resu…