Computer Modeling Indicates Dramatically Less DNA Damage from Far-UVC Krypton Chloride Lamps (222 nm) than from Sunlight Exposure

Ewan Eadie (Lead / Corresponding author), Paul O'Mahoney, Louise Finlayson, Isla Rose Mary Barnard, Sally Ibbotson, Kenneth Wood

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Abstract

This study aims to investigate, with computer modeling, the DNA damage (assessed by cyclobutane pyrimidine dimer (CPD) formation) from far-ultraviolet C (far-UVC) in comparison with sunlight exposure in both a temperate (Harwell, England) and Mediterranean (Thessaloniki, Greece) climate. The research utilizes the published results from Barnard et al. [Barnard, I.R.M (2020) Photodermatol. Photoimmunol. Photomed. 36, 476–477] to determine the relative CPD yield of unfiltered and filtered far-UVC and sunlight exposure. Under current American Conference of Governmental Industrial Hygienists (ACGIH) exposure limits, 10 minutes of sunlight at an ultraviolet (UV) Index of 4 – typical throughout the day in a temperate climate from Spring to Autumn - produces equivalent numbers of CPD as 700 hours of unfiltered far-UVC or more than 30,000 hours of filtered far-UVC at the basal layer. At the top of the epidermis these values are reduced to 30 and 300 hours respectively. In terms of DNA damage induction, as assessed by CPD formation, the risk from sunlight exposure greatly exceeds the risk from far-UVC. However the photochemistry that will occur in the stratum corneum from absorption of the vast majority of the high energy far-UVC photons is unknown, as are the consequences.
Original languageEnglish
JournalPhotochemistry and Photobiology
Early online date23 Jun 2021
DOIs
Publication statusE-pub ahead of print - 23 Jun 2021

Keywords

  • Biochemistry
  • General Medicine
  • Physical and Theoretical Chemistry

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