New approach to safety evaluation of human exposure to stochastically-varying electromagnetic fields
New approach to safety evaluation of human exposure to stochastically-varying electromagnetic fields
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DOI：
10.1109/temc.2005.853717
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发表时间：
2005-11-01
影响因子：
2.1
通讯作者：
Uda, T
中科院分区：
文献类型：
--
作者：
Wang, JQ;Fujiwara, O;Uda, T
本文对实验聚变设施内的高频(HF)和微波电磁场(EM)进行了统计测量，并将其暴露水平与安全指南进行了比较，以确保工作人员的安全。由于泄漏电磁场具有幅值随随机过程变化的时变特性，对其幅值概率分布进行了测量。然后提出了一种方法，从测量的时程得出暴露的人体的特定吸收率(SAR)。统计平均的全身平均SAR表明，泄漏的场强足够低，不会对特定电磁环境中的工作人员造成任何热危害。统计平均的SAR与根据安全指南中规定的6分钟以上的平均时间得出的SAR也显示出相当的一致性。这一发现表明，在6分钟内用时差测量代替现场测量是有用的，因为时差可以在远小于6分钟的时间内获得。
In this paper, high-frequency (HF) and microwave electromagnetic (EM) fields in experimental fusion facilities were statistically measured, and the exposure levels were compared with safety guidelines to ensure workers' safety. Since leaked EM fields have time-varying characteristics whose amplitudes vary according to a stochastic process, a measurement of their amplitude probability distribution (APD) was conducted. An approach was then presented to derive from the measured APD the specific absorption rate (SAR) in an exposed human body. The statistically-averaged whole-body-averaged SAR showed that the leaked field intensities were low enough to not cause any thermal hazards for the workers in the specific EM environment. The statistically averaged SAR also showed fair agreement with the SAR derived from the time average over 6 min as specified in the safety guidelines. This finding suggests the usefulness of the APD measurement in lieu of a field measurement over a 6-min period because the APD can be obtained in a time period much less than 6 min.