Cardis E, Deltour I, Mann S, Moissonnier M, Taki M, Varsier N, Wake K, Wiart J
Radiation Group, International Agency for Research on Cancer, 150 cours Albert Thomas, Lyon 69372, France.
Phys Med Biol. 2008 Jun 7;53(11):2771-83. doi: 10.1088/0031-9155/53/11/001. Epub 2008 May 1.
The rapid worldwide increase in mobile phone use in the last decade has generated considerable interest in possible carcinogenic effects of radio frequency (RF). Because exposure to RF from phones is localized, if a risk exists it is likely to be greatest for tumours in regions with greatest energy absorption. The objective of the current paper was to characterize the spatial distribution of RF energy in the brain, using results of measurements made in two laboratories on 110 phones used in Europe or Japan. Most (97-99% depending on frequency) appears to be absorbed in the brain hemisphere on the side where the phone is used, mainly (50-60%) in the temporal lobe. The average relative SAR is highest in the temporal lobe (6-15%, depending on frequency, of the spatial peak SAR in the most exposed region of the brain) and the cerebellum (2-10%) and decreases very rapidly with increasing depth, particularly at higher frequencies. The SAR distribution appears to be fairly similar across phone models, between older and newer phones and between phones with different antenna types and positions. Analyses of risk by location of tumour are therefore important for the interpretation of results of studies of brain tumours in relation to mobile phone use.
在过去十年中，全球手机使用量迅速增长，这引发了人们对射频（RF）可能致癌作用的极大兴趣。由于手机产生的射频暴露是局部性的，所以如果存在风险，那么对于能量吸收最多区域的肿瘤来说，风险可能最大。本文的目的是利用两个实验室对欧洲或日本使用的110部手机进行测量的结果，来描述大脑中射频能量的空间分布情况。大部分（根据频率不同，占97% - 99%）射频能量似乎被吸收在使用手机一侧的脑半球，主要（50% - 60%）在颞叶。平均相对比吸收率（SAR）在颞叶最高（取决于频率，占大脑最暴露区域空间峰值SAR的6% - 15%），在小脑为2% - 10%，并且随着深度增加迅速下降，尤其是在较高频率时。不同手机型号、新旧手机以及不同天线类型和位置的手机之间，SAR分布似乎相当相似。因此，按肿瘤位置分析风险对于解读与手机使用相关的脑肿瘤研究结果很重要。
