Abstract
IN the course of further measurements of conductivity induced in insulating materials by X–rays1,2, we have investigated polytetrafluoroethylene, and find a relatively large induced current with a very long time constant. A small cylindrical condenser 2.5 cm. long with polytetrafluoroethylene as the dielectric medium was used in a vacuum chamber for the measurements during irradiation. The current (down to 10−13 amp.) was measured with a Baldwin ‘Ionex’ Mk3 d.c. amplifier. The X-rays were generated at 220 kVp., with a half-value layer of 1.7 mm. of copper.
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References
Fowler, J. F., and Farmer, F. T., Nature, 171, 1020 (1953).
Fowler, J. F., and Farmer, F. T., Nature, 173, 317 (1954).
Mayburg, S., and Laurence, W. L., J. App. Phys., 23, 1006 (1952). Coleman, J. H. (private communication).
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Warner, A. J., Signal Corps Eng. Labs. Radiac Symposium (Federal Telecommunication Labs., Inc., New Jersey, Sept. 1949).
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FOWLER, J., FARMER, F. Conductivity induced in Polytetrafluoroethylene by X-rays. Nature 174, 136–137 (1954). https://doi.org/10.1038/174136b0
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DOI: https://doi.org/10.1038/174136b0
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