大学生受电脑电磁辐射的研究

Research on electromagnetic radiation contamination ofcollege students by personal computers

为了研究大学生受电脑电磁辐射的实际状况,采用EMR30电磁辐射分析仪,对电脑电磁辐射在100kHz～3GHz的电场强度值(V/m),进行了实验室研究性监测和宿舍、机房内的现场监测。监测的结果表明:宿舍中心处电磁辐射环境强度(100kHz～3GHz频率范围内的综合电场强度)低于0.5V/m;距离显示器屏幕前方0.4m以上操作电脑,则眼睛处辐射强度在安全值内。而目前,机房内台式电脑按行紧密摆放,前排电脑操作者后脑正对后一排电脑显示器突出的后部处,在后脑处辐射强度可超过10V/m;此外,学生宿舍空间拥挤鼠标、键盘通常与显示器近距离摆放在一起,造成显示器辐射与键盘鼠标自身辐射叠加,导致在键盘和鼠标处手掌受到的辐射强度大,不容忽视。

The present paper aims at introducing the authors' investigation of the harmful contamination to the specific group of people-the college students by the electromagnetic radiation from personal computers. The research covers the measurement done in the laboratory conditions so as to explore the regulation of the harmful electromagnetic radiation from PC as well as the on-spot measurement taken in the dormitory conditions and the computer classrooms. To make the results of investigation more valuable, the authors of this reserch have used the apparatus of EMR300 to measure the integrated intensity of the electromagnetic radiation of electromagnetic waves with frequency from 100 MHz to 3 GHz. The measuring results indicate that: for the students living in the dorms with no computers, the electromagnetic radiation intensity in the middle of the rooms are below the safety threshold. Meanwhile, the intensity for the students who operate computers, when they sit with their eyes 0.4 meters from the screens, the intensity at the location of their eyes is also below the safety threshold. However, in comparison with the above results, the next two results are not so optimistic: (1) in the computer classroom, it is found that: the computers are put in rows with the screens in one direction, and if the row spacing is below one meter, it would be more harmful for the students to work at the computers. In that case, the students would be seriously contaminated by the radiation which is emitted from the PC of the behind row. Since their heads are as close as 0.1 meters to the rearward of the display of the computers behind them. Also, in the dorms, it has been found that if the dorms are too small to leave enough space, most students put the keyboards and mice close to the displays, then the electromagnetic fields generated by the keyboards and mice themselves would be intensified by the electromagnetic field generated by the displays. Just for this reason, though the radiation is intensitied by the keyboards and mice are not big, the mixed radiation will be intensified near the keyboards and mice. And naturally, the radiation would be much bigger, particlarly, if they work there too long. Therefore, suggestions are brought forward in hope to arouse attention from the people and management concerned.