Chen J Y, Gandhi O P
Department of Electrical Engineering, University of Utah, Salt Lake City 84112.
Health Phys. 1989 Jul;57(1):89-98. doi: 10.1097/00004032-198907000-00011.
The three-dimensional finite-difference time-domain (FDTD) method has been used to calculate local, layer-averaged and whole-body averaged specific absorption rates (SARs) and internal radiofrequency (RF) currents in a 5628-cell, anatomically-based model of a human for plane-wave exposures from 20-100 MHz. The conditions of exposure of the human considered are: 1) isolated from ground, and 2) feet in contact with ground. Also considered are various separations of the model from ground and the use of insulating, rubber-soled footwear close to the grounded resonance frequency of 45 MHz. The calculated results are in agreement with the experimental data of Hill and others. While the existence of large foot currents has been known previously, substantial RF currents (600-800 mA) induced over much of the body are obtained for E-polarized fields suggested in the 1982 ANSI RF safety guideline.
三维时域有限差分（FDTD）方法已被用于计算一个基于人体解剖结构的5628单元模型在20 - 100 MHz平面波照射下的局部、层平均和全身平均比吸收率（SAR）以及内部射频（RF）电流。所考虑的人体暴露条件为：1）与地面隔离，以及2）双脚与地面接触。还考虑了模型与地面的各种间距以及在接近45 MHz的接地谐振频率时使用绝缘橡胶底鞋的情况。计算结果与希尔等人的实验数据一致。虽然之前已知存在较大的足部电流，但对于1982年美国国家标准学会（ANSI）射频安全指南中建议的E极化场，在人体大部分部位会感应出大量的射频电流（600 - 800 mA）。
