Study of Quantification of Coupling of Human Body to Power Frequency Electric and Magnetic Fields

人体与工频电场和磁场耦合的量化不仅需要讨论它们的生物学效应，还需要讨论动物暴露试验的电磁场条件。本文研究了电力线产生的电场和磁场的相量分析，以及人体感应电流的密度分析。得到的结果如下：1。在球体人体模型中计算了感应电流密度。结果表明，电场产生的感应电流密度是磁场产生的感应电流密度的几倍，而电场和磁场都来自于输电线。Poynting矢量分析表明，电力线下近地有效功率密度在几kw/m*m以上。当人体暴露在电场中时，覆盖在大脑上的脑脊液对大脑起到了屏蔽作用。假设电场和磁场的生物效应基于感应电流密度，则电场应用于动物暴露试验。磁场可以改变感应电流的方向。

The quantification of coupling of human body to power frequency electric and magnetic fields is needed to discuss not only about their biological effects, but also the electromagnetic field conditions for the animal exposure tests. This study deals with the phasor analyses of electric and magnetic fields from power lines, and the density analyses of induced currents in human body. The results obtained are as follows :1. Induced current densities have been calculated in the spheroidal human model. It is found that the density of induced current due to electric field is several times as great as that due to magnetic field, both fields being from power lines.2. The Poynting's vector analysis shows that the effective power density near the ground under power lines is on the order of several kw/m*m or more.3. The human brain is shielded by the cerebrospinal liquid covering the brain when the human body is exposed to electric fields.4. Assuming that the biological effects of electric and magnetic fields are based on induced current density, the electric field should be used in animal exposure tests. The magnetic field may act so as to change the direction of induced currents.