X-Ray Induced Electrical Polarization in Glass
- 15 December 1959
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 116 (6), 1436-1440
- https://doi.org/10.1103/physrev.116.1436
Abstract
Electrical polarization in a lead silicate glass induced by the action of x-rays on the material is found to exist. This phenomenon is surveyed experimentally as a function of total dose (incident and absorbed), dose rate, x-ray tube potential, radiation temperature, and temperature at which the polarization is released and measured. Net surface charges of the order of coulomb/ can be obtained from 3-mm thick samples irradiated at room temperature with r of 250-kv x-rays. To the first order the build-up and decay of this condition seems to follow the normal electrical relaxation as can be theoretically predicted from the dielectric and resistivity constants of the material (). Measured surface charge is shown to be proportional to absorbed dose for smaller doses; however, for greater doses final equilibrium in the polarization is reached when back electrical conduction becomes as large as the forward x-ray induced displacement current. The dependence of measured surface charge upon the sample thickness has been experimentally investigated for one case.
Keywords
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