Statistical variation in experiments for measurements of human UV exposure

R. A. Fleming; Cho-Fai Wong; B. W. Thomas

doi:10.1117/12.180820

21 July 1994 Statistical variation in experiments for measurements of human UV exposure

R. A. Fleming, Cho-Fai Wong, B. W. Thomas

Proceedings Volume 2134, Laser-Tissue Interaction V; and Ultraviolet Radiation Hazards; (1994) https://doi.org/10.1117/12.180820
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

Human exposure to solar UVR can be assessed by using multi-site passive dosimeters such as the polycarbonate CR-39. The variation in dosimeter response (absorbance) for ten sets of ten simultaneously exposed, then processed, badges was less than 6%. Possible sources of this variation include inaccuracies inherent in the dosimeter badge fabrication and calibration, and variation in experimental conditions during badge exposure and processing. Inherent inaccuracies may be minimized through use of homogeneous material, suitable backing substrate and by developing fabrication and cleaning techniques for the badge. Calibration of dosimeters may require use of both solar and lamp sources, with errors caused by seasonal changes in spectral content and proportion of direct to diffuse light. Regular spectroradiometric calibration of dosimeters is necessary to reduce errors of up to 50% which are introduced by seasonal effects. Experimental conditions during exposure depend on the activity of the wearer on the site of badge attachment and on its attitude to direct sunlight. Etchant concentration increased approximately 1% for each 100 badges processed. Other etching parameters such as etch time and temperature were varied +/- 10% from the standard values, and produced changes of 36% and 77% respectively.

Citation Download Citation

R. A. Fleming, Cho-Fai Wong, and B. W. Thomas "Statistical variation in experiments for measurements of human UV exposure", Proc. SPIE 2134, Laser-Tissue Interaction V; and Ultraviolet Radiation Hazards, (21 July 1994); https://doi.org/10.1117/12.180820

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