电磁暴露安全评估中数字人不确定度的研究

时变电磁场暴露作用于人体，会在人体组织中产生感应电流或能量吸收，从而影响到体内的生化过程，并可能导致健康问题。国际非电离辐射防护委员会(ICNIRP)、美国电子与电气工程师协会(IEEE)分别制订了电磁暴露的安全标准，要求在任何时候电磁暴露水平都不能超过基本限值。基本限值所涉及的感应电流密度，比吸收率(SAR)等参数受到电磁暴露安全评估中多种不确定因素的影响。与数字人相关的不确定因素有：数字人模型例数偏少且代表的人种单一，未成年人生物组织的电参数（电导率，介电常数）没有体现随年龄变化的特点。此外，ICNIRP导则与IEEE标准对电磁暴露安全评估参数有不同的定义，也影响了安全评估的结果。通过该项目的实施，我们希望搞清楚电磁暴露安全评估中数字人及其相关不确定因素对评估结果影响的程度；开发具有自主知识产权的电磁暴露安全评估软件平台,为国家相关部门电磁暴露安全防护标准的制定提供理论与技术支撑。

Exposure of the human body to time-varying electromagnetic fields (EMF) induces internal body currents and energy absorption in tissues that may affect biological processes and potentially cause health problems. Therefore the International Commission on Non-Ionizing Radiation Protection (ICNIRP) and the Institute of Electrical and Electronics Engineers (IEEE) have set international guidelines for limiting the exposure to EMF. In these guidelines the basic restrictions are defined as the current density or the specific absorption rate of energy (SAR). The guidelines require that these basic restrictions are not exceeded at any time.. There are many sources of uncertainties in safety assessment of occupational or public exposure of electric and magnetic fields. Regarding the models of digital humans, there are uncertainties in the quantity of human models. They are also specific for single human beings and does therefore not completely hold for others. Another uncertainty comes from the dielectric properties of the models i.e. the variations with ages have been ignored for the adolecents. Finally there are also uncertainties with respect to the averaging process in postprocessing specified in ICNIRP guidelines and IEEE standards..The focus of the present application is to investigate the dependence of safety assessment on the above uncertainties. In the mean time, we will develop the advanced software platform for safety assessment of EMF exposure with independent intellectual property rights. We believe the developments of this project will provide the theoretical and technical supports for formulating the national safety guidelines of exposure to electromagnetic fields.