Eadie Ewan, O'Mahoney Paul, Ibbotson Sally H, Miller C Cameron, Wood Kenneth
NHS Tayside, Photobiology Unit, Ninewells Hospital and Medical School, Dundee, UK.
Optical Radiation Effects Group, Harwell Campus, UK Health Security Agency, Oxford, UK.
Photochem Photobiol. 2025 Mar-Apr;101(2):270-274. doi: 10.1111/php.14005. Epub 2024 Jul 20.
In 2015, a study showed that Krypton-Chloride (KrCl) excimer lamps could induce erythema and basal layer DNA damage in human skin. Later studies found that filtering out longer wavelength emissions from these lamps resulted in no acute skin effects. However, there is a limited understanding of how much to reduce unwanted emissions and which wavelengths are important. Accurate spectral irradiance data is therefore crucial for safety, as variance in optical filtering significantly affects the weighted irradiance of a lamp. To simplify the risk assessment process for Far-UVC lamps, we highlight the usefulness of the lamp exposure limit (H) and present this in the context of spectral emission data for 14 commercially available Far-UVC lamps. Our results demonstrate that relying solely on a radiometric measurement and a single-wavelength exposure limit at 222 nm could lead to over-exposure. The H is a practical metric which can be utilized to determine the exposure time before reaching the exposure limit. It can also be used in the determination of the minimum ceiling height for compliance with standards like UL 8802. Manufacturers are urged to provide H for their products; installers should adhere to H; and standards and regulatory bodies should insist on this information in new guidance.
2015年的一项研究表明，氪氯（KrCl）准分子灯可导致人体皮肤出现红斑和基底层DNA损伤。后来的研究发现，滤除这些灯发出的较长波长的辐射不会产生急性皮肤效应。然而，对于减少不必要的辐射量以及哪些波长至关重要，人们的了解有限。因此，准确的光谱辐照度数据对于安全至关重要，因为光学过滤的差异会显著影响灯的加权辐照度。为了简化远紫外线C灯的风险评估过程，我们强调了灯暴露限值（H）的有用性，并结合14种市售远紫外线C灯的光谱发射数据进行了介绍。我们的结果表明，仅依靠辐射测量和222纳米处的单波长暴露限值可能会导致过度暴露。H是一个实用的指标，可用于确定达到暴露限值之前的暴露时间。它还可用于确定符合UL 8802等标准的最小天花板高度。敦促制造商提供其产品的H值；安装人员应遵守H值；标准和监管机构应在新指南中坚持要求提供此信息。
