Foundation for Research on Information Technologies in Society (IT'IS), Zeughausstr. 43, 8004 Zürich, Switzerland.
Phys Med Biol. 2010 Apr 7;55(7):1767-83. doi: 10.1088/0031-9155/55/7/001. Epub 2010 Mar 5.
The peak spatial specific absorption rate (SAR) assessed with the standardized specific anthropometric mannequin head phantom has been shown to yield a conservative exposure estimate for both adults and children using mobile phones. There are, however, questions remaining concerning the impact of age-dependent dielectric tissue properties and age-dependent proportions of the skull, face and ear on the global and local absorption, in particular in the brain tissues. In this study, we compare the absorption in various parts of the cortex for different magnetic resonance imaging-based head phantoms of adults and children exposed to different models of mobile phones. The results show that the locally induced fields in children can be significantly higher (>3 dB) in subregions of the brain (cortex, hippocampus and hypothalamus) and the eye due to the closer proximity of the phone to these tissues. The increase is even larger for bone marrow (>10 dB) as a result of its significantly high conductivity. Tissues such as the pineal gland show no increase since their distances to the phone are not a function of age. This study, however, confirms previous findings saying that there are no age-dependent changes of the peak spatial SAR when averaged over the entire head.
使用标准化特定人体模型头模型评估的峰值空间比吸收率（SAR）已被证明，对于使用移动电话的成年人和儿童，其暴露估计是保守的。然而，关于年龄相关介电组织特性和颅骨、面部和耳朵比例对整体和局部吸收的影响，特别是在脑组织中，仍存在一些问题。在这项研究中，我们比较了不同基于磁共振成像的成年和儿童头部模型暴露于不同手机模型时大脑不同部位的吸收情况。结果表明，由于手机更接近这些组织，儿童的局部诱导场在大脑（皮层、海马体和下丘脑）和眼睛的子区域中可能显著更高（>3dB）。由于骨髓的电导率显著较高，因此增加幅度更大（>10dB）。由于与手机的距离不是年龄的函数，像松果体这样的组织则没有增加。然而，这项研究证实了之前的研究结果，即当平均整个头部时，峰值空间 SAR 没有年龄依赖性变化。
