title: Evaluation of a single-monochromator diode array spectroradiometer for sunbed UV-radiation measurements.
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.
authors.affiliation: STUK, Radiation and Nuclear Safety Authority, Non-Ionizing Radiation Laboratory, Helsinki, Finland. lasse.ylianttila@stuk.fi
authors.forename: Lasse
authors.initials: L
authors.lastname: Ylianttila
authors.forename: Reijo
authors.initials: R
authors.lastname: Visuri
authors.forename: Laura
authors.initials: L
authors.lastname: Huurto
authors.forename: Kari
authors.initials: K
authors.lastname: Jokela
mesh_terms: D002138:Calibration; D004867:Equipment Design; D005069:Evaluation Studies as Topic; D011834:Radiation Monitoring / Q000295:instrumentation* / Q000379:methods; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet / Q000295:instrumentation* / Q000379:methods; D013696:Temperature; D014466:Ultraviolet Rays