"Even though it's relatively reassuring, I also think it's important that we keep an eye on the rates of brain tumours and other cancers," he said. "One can't know what the long-term consequences are of something that has been around for only a short period."
There has been speculation about the health effects of using mobile phones for years. The HPA conducted a previous review in 2003, which also concluded that there was no evidence of harm. But there is now far more research into the subject.
Advice on children
The experts said more work was needed on the effect of radio frequency fields on brain activity, and on the possible association with behavioural problems in children. They also called for more investigation into the effects of new technology which emits radio frequency, such as smart meters in homes and airport security scanners.
The HPA said it was not changing its advice about mobile phone use by children. "As this is a relatively new technology, the HPA will continue to advise a precautionary approach," said Dr John Cooper, director of the HPA's centre for radiation, chemical and environmental hazards. "The HPA recommends that excessive use of mobile phones by children should be discouraged."
55.What does the HPA not do according to the passage?
A. It gives advice to children on using mobile phones.
B. It monitors the effects of low-level radio frequency.
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