Is It Safe

E-mail notification, then @ Zhuang brother to answer four questions about high-speed rail radiation of the Beijing News reporter. View of a lot of people to consult hair blog publicly expressed improperly at knowledgeable experts criticized the correction.

Question:
 1, the high-speed rail trains why would produce electromagnetic radiation?
2, the intensity of electromagnetic radiation of high-speed rail trains?
 3, the standard of our country in the aspects of electromagnetic radiation?
4, excessive electromagnetic radiation harmful to human harm?

My answer:
 A high-speed rail and does not produce electromagnetic radiation, but only generated frequency electric field and power frequency magnetic field. Generation of electromagnetic radiation with wavelength is proportional to the antenna, the antenna is about more than 1/10 of the wavelength to the effective radiated power frequency 50Hz, the wavelength of 6000 km, the high-voltage lines is difficult to produce an effective electromagnetic radiation.

2. The SEPA radiation safety standards a lot, but the vast majority against ionizing radiation standards for electromagnetic radiation electromagnetic radiation protection standards (GB8702-88), but for the frequencies above 100kHz work of 50 Hz frequency is not a problem, but my reference to the international standard-frequency electric field limit 4kv / m, power frequency magnetic field 0.1 mT. A large number of the measured value of the power transmission system, even though the maximum voltage, frequency electric field and power frequency magnetic field value is far below the limit, and high-speed rail will be no exception.

3. "Electromagnetic radiation protection standards" (GB8702-88) restrictions associated with the frequency of common 900MHz mobile phone frequency limit of 40 microwatts / square cm, while the United States is 600 microwatts / square centimeter from 20 Waki station 10 m of the measured value is 0.6 microwatts / square centimeter.

4. Electromagnetic radiation encountered in daily life will not be exceeded, which in itself is a pseudo-problem. Also do not have to worry about even occasionally exceeded WHO carcinogenic electromagnetic radiation the equivalent with coffee and pickles, of course you do not have to drink a few cups of coffee to worry about cancer.