Precise dosimetry of current density inside human body exposed to ELF EM field

首先，在一定条件下对IH电磁炉的漏磁场进行了测量，并对磁偶极子源进行了建模。然后，在日本成年男性/女性和美国成年男性的三种解剖人体模型之间，比较了由模型的差异引起的最大感应电流密度。此外，还与国际非电离辐射防护委员会（ICNIRP）的指南进行了比较。结果表明，最大感应电流随人体模型的不同而有很大差异，但在便携式IH炊具和为IH炊具设计的平底锅的情况下，超过ICNIRP指南的感应电流可能不会在人体内流动。其次，对交流驱动电动剃须刀的三维漏磁场分布进行了精密测量，得到了等效简单磁源模型。另外，利用该简单的源模型，得到了人体头部模型中的感应电流密度分布。由于合作者的便利性，无法测量三维场分布，因此开发了一套针对感应加热炉的三维场测量系统。该系统结合位置传感器（动作捕捉）和磁场传感器测量磁场分布。本研究的未来计划是尝试使用这种新的三维磁场测量系统实时可视化磁场分布并将其应用于源搜索，并开发通过屏蔽家用电器有效减少漏磁场的技术。

First of all, the leakage magnetic field of the IH cooker has been measured on some conditions, and the magnetic dipole source was modeled. Then, the maximum induced current densities by the difference of the model have been compared among three kinds of anatomical human models of the Japanese adult male/female and the American adult male. Moreover, the induced current densities averaged by the area of 1 cm^2 is compared with the guideline of international commission on non-ionizing radiation protection (ICNIRP). As a result, it is found that the maximum induced current are considerably different depending on human models, but the induced currents that exceed the guideline of ICNIRP may not flow inside human body in the case with the portable type IH cooker and pan designed for the IH cooker.Next, the 3-D distribution of the leakage field of an AC drive electric shaver has been measured in precision, and the equivalent simple magnetic source model has been obtained. In addition, the induced current density distribution in the human body head model has been obtained using this simple source model.Since 3-D field distribution was not able to be measured by study collaborator's convenience, an original 3-D field measurement system has been developed for the induction heating cooker. This system measures the field distribution combining the position sensor (motion capture) and the field sensor.The future plans of this study are to try a real-time visualization of the magnetic field distribution and the application to the source quest with this new 3-D field measurement system, and to develop the technique for effectively reducing the leakage magnetic field by shielding the household appliance.