Erasmus MC-Daniel den Hoed Cancer Center, Department of Radiation Oncology, Section Hyperthermia, PO box 5201, NL-3008 AE, Rotterdam, The Netherlands.
Phys Med Biol. 2010 Jun 7;55(11):3115-30. doi: 10.1088/0031-9155/55/11/009. Epub 2010 May 12.
To avoid potentially adverse health effects of electromagnetic fields (EMF), the International Commission on Non-Ionizing Radiation Protection (ICNIRP) has defined EMF reference levels from the basic restrictions on the induced whole-body-averaged specific absorption rate (SAR(wb)) and the peak 10 g spatial-averaged SAR (SAR(10g)). The objective of this study is to assess if the SAR in children remains below the basic restrictions upon exposure at the reference levels. Finite difference time domain (FDTD) modeling was used to calculate the SAR in six children and two adults when exposed to all 12 orthogonal plane wave configurations. A sensitivity study showed an expanded uncertainty of 53% (SAR(wb)) and 58% (SAR(10g)) due to variations in simulation settings and tissue properties. In this study, we found that the basic restriction on the SAR(wb) is occasionally exceeded for children, up to a maximum of 45% in small children. The maximum SAR(10g) values, usually found at body protrusions, remain under the limit for all scenarios studied. Our results are in good agreement with the literature, suggesting that the recommended ICNIRP reference levels may need fine tuning.
为避免电磁场（EMF）可能带来的不良健康影响，非电离辐射防护国际委员会（ICNIRP）已对基本限制下的全身平均比吸收率（SAR(wb))和峰值 10g 空间平均 SAR（SAR(10g))）规定了 EMF 参考水平。本研究旨在评估在参考水平下，儿童的 SAR 在接触时是否仍低于基本限制。我们使用时域有限差分法（FDTD）模型计算了在 12 个正交平面波配置下所有情况下 6 名儿童和 2 名成人的 SAR。敏感性研究显示，由于模拟设置和组织特性的变化，SAR(wb))和 SAR(10g))的扩展不确定度分别为 53%和 58%。在本研究中，我们发现对于儿童，SAR(wb))的基本限制偶尔会被超过，在较小的儿童中最大可达 45%。在所有研究的情况下，通常在身体突起处发现的最大 SAR(10g)值仍低于限值。我们的结果与文献一致，表明建议的 ICNIRP 参考水平可能需要微调。
