UV dosimeters based on neotetrazolium chloride

Andrew Mills, P. Grosshans, M. MacFarlane

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


A novel UV dosimeter is described comprising a tetrazolium dye, neotetrazolium chloride (NTC), dissolved in a film of polymer, polyvinyl alcohol (PVA). The dosimeter is pale yellow/colourless in the absence of UV light, and turns red upon exposure to UV light. The spectral characteristics of a typical UV dosimeter film and the mechanism through which the colour change occurs are detailed. The NTC UV dosimeter films exhibit a response to UV light that is related to the intensity and duration of UV exposure, the level of dye present in the films and the thickness of the films themselves. The response of the dosimeter is temperature independent over the range 20-40 degrees C and, like most UV dosimeters, exhibits a cosine-like response dependence upon irradiance angle. The introduction of a layer of a UV-screening compound which slows the rate at which the dosimeter responds to UVR enables the dosimeter response to be tailored to different UV doses. The possible use of these novel dosimeters to measure solar UV exposure dose is discussed. (c) 2008 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)136-141
Number of pages6
JournalJournal of Photochemistry and Photobiology A: Chemistry
Issue number2-3
Publication statusPublished - 25 Jan 2009

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)
  • Physics and Astronomy(all)


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