Automatic read-out device for ultraviolet-radiation polymer-film dosimeters |
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| Authors: | M G Pepper B L Diffey |
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| Institution: | (1) Electronics Laboratories, University of Kent, Canterbury, Kent, England;(2) Medical Physics Department, Nuffield Ward, Dryburn Hospital Durham DH1 5TW, England |
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| Abstract: | An automatic device for measuring the optical absorbance of polymer film used as an ultravioletradiation dosimeter is described.
The automated mechanics are based on a commercial slide projector. The ultraviolet radiation is generated by a tungsten quartz-halogen
bulb. The optical absorbance is determined by analogue logarithmic circuitry and the resultant value displayed on a digital
panel meter. A digital printer or paper-tape punch may be used for hard-copy output. An uncertainty in measurement of 1% is
obtained. The device temperature stability is such that this uncertainty can be maintained for analogue circuit temperatures
of 20–40°C. |
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| Keywords: | Automatic read-out device Logarithmic Polymer film Ultraviolet radiation dosimetry |
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