Date of this Version
Thesis (M.S.)—University of Nebraska—Lincoln, 1956. Department of Physics.
For this investigation, a regular scintillation counter would be assembled with provisions for easy change of scintillator, a placement of an alpha source near the sensitive surface of the phosphor, and a moveable shutter to block the alpha particles from the phosphor.A collimating arrangement in the form of a slit would permit only a strip on the sensitive surface to be bombarded, and electrodes would be placed on both sides of this strip for application of the field.Since the alphas used had a range in air of only about 3.8 cm, a transverse field had to be used, because conducting electrodes thin enough to pass most of the alpha particles were not available.
From the experiment work reported here, one can conclude:
(1) A definite, measurable effect of electric fields on several zinc sulphide scintillators exists below the level of electroluminescence;
(2) The effect for the phosphors tried here is to diminish the counting rate which must be a reflection on a diminished amount of light produced per particle;
(3) The effect diminished if the field was kept on the scintillator for a time period of the order of minutes.
Advisor: E. J. Zimmerman