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Related Experiment Videos

Relationship between UVB and erythemally weighted radiation.

Richard McKenzie1, Dan Smale, Michael Kotkamp

  • 1National Institute of Water and Atmospheric Research, Lauder, PB 50061 Omakau, Central Otago, New Zealand. r.mckenzie@niwa.co.nz

Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology
|March 3, 2004
PubMed
Summary

This study explains the shift from reporting damaging UVB radiation to using erythemally weighted UV radiation (UV(Ery)) and the UV Index (UVI). Simple formulas approximate UVB levels from UV(Ery) and UVI, accurate for most practical solar zenith angles.

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Area of Science:

  • Environmental Science
  • Atmospheric Science
  • Dermatology

Background:

  • Historically, damaging ultraviolet (UV) radiation was reported as UVB.
  • Current standards utilize erythemally weighted UV radiation (UV(Ery)) and the UV Index (UVI).
  • Understanding the relationship between these metrics is crucial for accurate UV exposure assessment.

Purpose of the Study:

  • To quantify the relationship between UVB radiation and erythemally weighted UV radiation (UV(Ery)) and the UV Index (UVI).
  • To provide conversion factors for estimating UVB from UV(Ery) and UVI.
  • To offer tools for more accurate UV radiation calculations and conversions for different biological weightings.

Main Methods:

  • Analysis of spectral measurements to verify relationships.

Related Experiment Videos

  • Development of approximate formulas relating UVB to UV(Ery) and UVI.
  • Creation of correction tables for accurate conversions under various conditions.

    • Main Results:

    • Established an approximate relationship: UVB(280-315 nm) ≈ 7.55 × UV(Ery).
    • Determined that UVB(280-315 nm) ≈ 18.9 × UVI (in W m⁻²).
    • These approximations maintain ~10% accuracy for solar zenith angles < 70 degrees.

    Conclusions:

    • The study provides practical approximations for converting between different UV radiation metrics.
    • The findings are generally applicable for most common solar zenith angles.
    • Additional tables enhance accuracy for specific conditions and other biological weightings.