QUALIFICATION OF ELF MAGNETIC FIELD ENVIRONMENT FOR HEALTH RISK EVALUATION BY ELF MAGNETIC FIELD

成功地研究了生物材料在超低频磁场和电场作用下感应电流的基本特性，为环境磁场测量系统的设计提供了初步数据。得到了以下结果：(1)提出了偏心双层球形模型中感应电流分布的半理论表达式。(2)通过引入边界区域电流密度连续性的新边界条件，成功地改进了传统的“阻抗法”，提高了数值精度。(3)应用上述两种数值方法估算了不同几何和环境条件下的磁感应电流分布。(4)指出在精确讨论感应电流时，应考虑组织膜的存在。(5)磁场和电场同时作用下产生的磁感应和电感产生的感应电流。上述结果将为下一阶段的环境磁场测量系统的设计提供有用的数据。

Basic characteristics of induced current in bio-materials exposed to ELF magnetic and electric fields are successfully investigated in order to provide preliminary data that will be useful to design the measuring system of environmental magnetic field.The following results are obtained.(1) Semi-theoretical expression to estimate the induced current distribution in eccentric double-layered spherical model is proposed.(2) Conventional "impedance method" is successfully modified to improve the numerical precision by introducing new boundary condition on the continuity of current density at boundary Area.(3) Two numerical procedure mentioned above are applied to estimate the magnetically induced current distribution under various geometrical and environmental conditions, and their characteristics are discussed.(4) It is pointed out that the existence of tissue membranes should be taken into account for the precise discussion of induced current.(5) Resultant induced current attributed to the magnetic and electrical induction caused by simultaneous exposure to magnetic and electric fields.Those results mention above will offer useful data to design the measuring system of environmental magnetic field as a next stage of the research project.