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
- Hillary stays on: Clinton’s CV is chock full of firsts: The only first lady to become a U.S. senator turned viable presidential candidate turned secretary of state. Now a private citizen, she continues to be one of the most watched and listened-to women on the planet. All bets on that she will be the 2016 Democratic presidential candidate and the free world’s presumptive next leader. She’s done little to quiet the chatter, including hitting the speaking circuit last month at an estimated $200,000 fee per event and inking a reported $14 million book deal.
- 3. 2012年搞笑诺贝尔奖之声学奖
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Department of Health and Human Services - RHP&R - Health Protection - Environmental Health Unit
Page content currently being reviewed.
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