The minimum standards of danger are different:
1) The corresponding requirements in China are that the electric field strength should not exceed 4000V/ m and the magnetic field strength should not exceed 100 microtesla.
2) Sweden 0.2 micro Tesla
1. The conclusion of Swedish National Council for Industry and Technology Development: 1 and 1.5 Children under 5 years old are more than 2.7 times more likely to suffer from leukemia if they are exposed to an environment with an average magnetic induction intensity greater than 0.2 microtesla; 2. If the magnetic induction is greater than 0.3 micro Tesla, it is 3.8 times.
3) The power frequency magnetic field in the United States is 0.2 micro Tesla.
1995 The National Radiation Protection Committee (NCRP) of the United States put forward the guideline of electromagnetic field exposure, which also mentioned that Sweden put forward the power frequency magnetic field of 0.2 micro Tesla as the guideline of transmission lines crossing residential areas according to the correlation between childhood leukemia and the annual magnetic field level.
After considering the laboratory report on ecological impact and epidemiology, the Committee recommended that:
The magnetic field near newly-built nurseries, schools and playgrounds shall not exceed 0.2 micro Tesla. No new houses shall be built under or near the existing high-voltage transmission lines, and the time for exceeding 0.2 micro Tesla magnetic field every day shall not exceed 2 hours. When building new transmission and distribution lines, do not make the magnetic field in adjacent existing houses exceed 0.2 microtesla. Build a new office and reduce the intermittent and ambient magnetic field to 0.2 microtesla.
The conclusion of California Health Science Assessment Agency: "Electromagnetic field can increase the risk of childhood leukemia, adult malignant brain tumor, amyotrophic lateral sclerosis, abortion and so on. To a certain extent, this may lead to suicide and adult leukemia. "
4) UK 0.4 micro Tesla
The reporter saw a report written in 200 1 from the official website of the British National Radiation Protection Committee. According to the report, 700,000 people are born in Britain every year, among which 500 children with leukemia and 1 0,000 children with cancer are found in the population under 0.5 years old every year. At least two of the 500 children with leukemia each year are directly related to the electromagnetic radiation generated by high-voltage wires. In this way, the incidence of leukemia in children living under electromagnetic radiation is one in 700, which is twice as high as that in children living without electromagnetic radiation (1400). The Committee has set the risk value as 0.4 microtesla, above which children will be at risk of getting sick.
5) Denmark 0.3 ~ 0.4 micro Tesla
Denmark conducted a survey on 1707 children 16 years old living near high-voltage transmission lines. The results show that children living in houses with an average electromagnetic field intensity of 0.3 ~ 0.4 microtesla are prone to cancer.
In 200 1 year, the International Center for Research on Cancer has identified magnetic pollution as a carcinogenic factor, and pointed out that when the magnetic field intensity in the living environment exceeds 0.4 μ τ, the incidence of childhood leukemia will increase significantly.
That is to say, the minimum value of danger should be greater than 0.2ut, and 0. 15-0. 1 should be no problem.