Also called

  • EMF

Summary

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    n. 改善(正), 修正案,某物质能改善土壤有助生长
  • 专家表示,2016年对中国电影业来说是非凡的一年,因为它实现增长的同时面临着多种挑战,包括互联网的快速发展、中国观众日益高雅的品味和国家的经济衰退。
  • 泰勒 斯威夫特
  • sincerely
Electromagnetic fields (EMF) are generated in the vicinity of power lines, mobile phones, mobile phone towers, broadcast towers and similar transmitters. Whether or not EMF can harm human health is a controversial issue. One EMF source to have received significant media attention is the high-voltage power line.

Various studies have comprehensively investigated power lines and cancers (such as leukaemia) to see if there is a causal link. Some researchers maintain that EMF generated by power lines have frequencies which are too low to influence living cells or harm DNA. Other researchers disagree. They suggest that EMF from power lines can cause significant changes in a biological system via electric fields induced in the body. Scientific standards have been developed to limit public exposure to power-frequency EMF, so that induced currents are below those that occur naturally in the body.

Two decades of debate

In 1979, researchers investigating childhood leukaemia in Denver, Colorado (USA) found an association between high-current configuration electrical wiring near the home and an increased risk of childhood cancer (Wertheimer and Leeper). This initial work, however, did not measure electromagnetic fields, relying instead on distances from power lines and the type of wiring. Since then, researchers across the world have investigated power lines. To date, serious limitations have been identified in nearly all studies on power lines and cancer. It has not been possible to confirm whether or not there is a real association between EMF and cancer.

UK findings are inconclusive

The National Radiological Protection Board (NRPB) in the United Kingdom recently released a report which found some evidence that EMF exposures higher than 0.4 microtesla (µT) are associated with a doubling of the risk of leukaemia in children. The review found no evidence of any increased risk of cancer in adults. However, the NRPB was careful to explain that no causal link was found, and recommended that further studies are needed. The evidence for the effect was inconclusive because the key studies in the review might have suffered from selection bias or random variation.

No proof of harm

Despite the evidence for an increased risk of leukaemia in children exposed to higher than 0.4µT of EMF, a range of experimental studies have failed to provide clear supporting evidence for the claim that EMF can be harmful to health, including:
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Victorian government policy

The Victorian Department of Human Services supports the view that current guidelines on EMF and power lines are adequate, since the EMF generated by power lines is well below the recommended maximum limit of exposure. However, it is advisable to avoid heavy exposure, if possible.

Where to get help

  • Your doctor
  • Department of Health, Radiation Safety Team Tel. 1300 767 469

Things to remember

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    谨祝新年快乐幸福,大吉大利。
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  • 对专业投资者而言,2014年最令人沮丧的一点是,美国经济复苏时断时续。2014年1月,经济领域捷报频传。然而,在短短几周内,一场暴风雪席卷全美,各种经济数据似乎也因此停摆。
  • 3. 2012年搞笑诺贝尔奖之声学奖
References
  • Wertheimer, N. & Leeper, E. (1979), 'Electrical wiring configurations and childhood cancer', in American Journal of Epidemiology, vol. 109, no. 3, pp. 273-384, The Johns Hopkins University Bloomberg School of Public Health, USA. Published by Oxford University Press, UK. More information here.
  • Non-ionizing radiation: 50Hz magnetic fields from electricity (2002) [online factsheet], Radiation and Health Information, The Australian Radiation Protection and Nuclear Safety Agency, Department of Health and Ageing, Commonwealth Government of Australia, Canberra. More information here.
  • Moulder, J. E. (2002), Electromagnetic fields and human health, Medical College of Wisconsin, USA. More information here.

More information

Environmental health

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Environmental health basics

House and garden

Chemical and metal pollutants

Air and water quality

Food quality and safety

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Climate change

Public health and disease control

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This page has been produced in consultation with and approved by: Department of Health and Human Services - RHP&R - Health Protection - Environmental Health Unit

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