Development of a novel UV indicator and dosimeter film

Andrew Mills, Soo-Keun Lee, Martin Sheridan

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

A novel UV indicator is described, comprising nanocrystalline particles of titania dispersed in a film of a polymer, hydroxyl ethyl cellulose (HEC), containing: a mild reducing agent, triethanolamine (TEOA) and a redox indicator, methylene blue (MB). The UV indicator film is blue-coloured in the absence of UV light and loses colour upon exposure to UV light, attaining within a few min a steady-state degree of bleaching that can provide a measure of the irradiance of the incident light. The original blue colour of the film returns once the source of UV light is removed. The spectral characteristics of a typical UV indicator film, and its components, are discussed and the UV-absorbing action of the titania particles highlighted. From the measured %bleaching undergone by a typical UV indicator as a function of light irradiance the indicator appears fully bleached, within 7 min, by a UV irradiance of 3 mW cm-2 or greater. The mechanism by which the UV indicator works is described. The reversible nature of the UV indicator is removed by covering a typical UV indicator with a thin, largely oxygen impermeable, polymer film, such as the regenerated cellulose found in Sellotape. The product is a UV dosimeter, the response of which is related to the intensity and duration of the incident UV light, as well as the amount of titania in the film. A typical UV dosimeter film is fully bleached by 250 mJ cm-2 of UV light. The possible use of these novel indicators to measure UV exposure levels, irradiance and dose, is discussed.
Original languageEnglish
Pages (from-to)1046-1051
Number of pages5
JournalAnalyst
Volume130
Issue number7
DOIs
Publication statusPublished - 2005

Keywords

  • UV indicator
  • dosimeter film

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  • Cite this

    Mills, A., Lee, S-K., & Sheridan, M. (2005). Development of a novel UV indicator and dosimeter film. Analyst, 130(7), 1046-1051. https://doi.org/10.1039/b502969d