Cancer and Population Studies, Queensland Institute of Medical Research, Brisbane, Qld, Australia.
Photochem Photobiol. 2010 Mar-Apr;86(2):445-8. doi: 10.1111/j.1751-1097.2009.00686.x. Epub 2010 Jan 22.
Generating accurate population-specific public health messages regarding sun protection requires knowledge about seasonal variation in sun exposure in different environments. To address this issue for a subtropical area of Australia, we used polysulphone badges to measure UVR for the township of Nambour (26 degrees latitude) and personal UVR exposure among Nambour residents who were taking part in a skin cancer prevention trial. Badges were worn by participants for two winter and two summer days. The ambient UVR was approximately three times as high in summer as in winter. However, participants received more than twice the proportion of available UVR in winter as in summer (6.5%vs 2.7%, P < 0.05), resulting in an average ratio of summer to winter personal UVR exposure of 1.35. The average absolute difference in daily dose between summer and winter was only one-seventh of a minimal erythemal dose. Extrapolating from our data, we estimate that ca. 42% of the total exposure received in the 6 months of winter (June-August) and summer (December-February) is received during the three winter months. Our data show that in Queensland a substantial proportion of people's annual UVR dose is obtained in winter, underscoring the need for dissemination of sun protection messages throughout the year in subtropical and tropical climates.
生成针对特定人群的有关防晒的准确公共卫生信息需要了解不同环境中季节性的太阳暴露变化。为了解决澳大利亚亚热带地区的这一问题，我们使用聚砜徽章来测量 Nambour（纬度 26 度）镇的紫外线辐射 (UVR)，以及参与皮肤癌预防试验的 Nambour 居民的个人 UVR 暴露情况。参与者在两个冬季和两个夏季佩戴徽章。夏季的环境 UVR 大约是冬季的三倍。然而，参与者在冬季获得的可用 UVR 比例却是夏季的两倍多（6.5%对 2.7%，P < 0.05），导致夏季和冬季个人 UVR 暴露的平均比值为 1.35。夏季和冬季之间每日剂量的平均绝对差异仅为最小红斑剂量的七分之一。根据我们的数据推断，在冬季（6 月至 8 月）和夏季（12 月至 2 月）的 6 个月中，大约有 42%的总暴露量是在冬季的三个月中获得的。我们的数据表明，在昆士兰州，人们的年度 UVR 剂量中有相当大的一部分是在冬季获得的，这凸显了在亚热带和热带气候中全年传播防晒信息的必要性。
