Nagoya Institute of Technology, Nagoya 466-8555, Japan.
IEEE Trans Biomed Eng. 2010 May;57(5):1234-42. doi: 10.1109/TBME.2009.2038896. Epub 2010 Feb 17.
In the current international guidelines and standards for human exposure to microwaves (MWs), the basic restriction is determined by the whole-body average specific absorption rate (SAR). The basis for the guidelines is the adverse effect such as work stoppage in animals for whole-body average SARs above a certain level. Although it is known that absorbed MW energy causes the behavioral sign of thermal stress, the relationship of whole-body average SAR with temperature/temperature elevation has not been sufficiently investigated. In the present study, we performed experiments on rabbits exposed to 2.45-GHz MWs. A total of 24 measurements were conducted for power densities from approximately 100 to 1000 W/m(2). Our computational code for electromagnetic-thermal dosimetry was used to set the exposure time duration and incident power density. Our experimental results suggest that a core temperature elevation of 1 degrees C is an estimate of the threshold-inducing complex behavioral signs of MW-induced thermal stress in rabbits for different whole-body average SARs and exposure time durations. The whole-body average SAR required for MW-induced behavioral sign in rabbits was estimated as approximately 1.3 W/kg for 2.45-GHz MWs.
在当前的国际微波（MW）人体暴露指南和标准中，基本限制是由全身平均比吸收率（SAR）决定的。这些指南的基础是对于全身平均 SAR 超过一定水平的动物，会产生停止工作等不良影响。虽然已经知道吸收的 MW 能量会导致热应激的行为迹象，但全身平均 SAR 与温度/温度升高之间的关系尚未得到充分研究。在本研究中，我们对暴露于 2.45GHz MW 的兔子进行了实验。总共进行了 24 次测量，功率密度约为 100 至 1000 W/m²。我们的电磁热剂量学计算代码用于设置暴露时间持续时间和入射功率密度。我们的实验结果表明，核心温度升高 1°C 是估计不同全身平均 SAR 和暴露时间持续时间下，MW 诱导热应激引起的复杂行为迹象的阈值。对于 2.45GHz MW，兔子产生 MW 诱导行为迹象所需的全身平均 SAR 约为 1.3 W/kg。
