Evaluation of a single-monochromator diode array spectroradiometer for sunbed UV-radiation measurements |
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Authors: | Ylianttila Lasse Visuri Reijo Huurto Laura Jokela Kari |
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Affiliation: | STUK, Radiation and Nuclear Safety Authority, Non-Ionizing Radiation Laboratory, Helsinki, Finland. lasse.ylianttila@stuk.fi |
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Abstract: | The suitability of a new technology single-monochromator diode array spectroradiometer for UV-radiation safety measurements, in particular for sunbed measurements, was evaluated. The linearity, cosine response, temperature response, wavelength scale, stray-light and slit function of the spectroradiometer were determined and their effects on the measurement accuracy evaluated. The main error sources were stray-light and nonideal cosine response, for which correction methods are presented. Without correction, the stray-light may reduce the accuracy of the measurement excessively, particularly in the UV-B range. The expanded uncertainty of the corrected UV measurements is estimated to be 14%, which is confirmed with the comparative measurements carried out with a well-characterized double-monochromator spectroradiometer. The measurement accuracy is sufficient for sunbed measurements, provided that all corrections described above have been done and the user of the instrument has a good understanding of the instrument's operating principles and potential error sources. If these requirements are met, the tested spectroradiometer improves and facilitates market surveillance field measurements of sunbeds. |
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