The Australian research focused on the thermal effects or specific absorption rate (SAR) of radio frequency radiation - a measure of its actual effects on brain tissue, whereas the earlier study simply looked at electromagnetic radiation levels.

BBC: Hands-free mobiles given safety boost

When we talk about telescopes, we're usually referring to devices that "see" the visual spectrum of light, but astronomers also build telescopes that gather radiation like radio waves and X rays in order to peer deep into outer space.

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The concerns stem from the emissions of radio frequency (RF) radiation by both the handsets and the base stations that transmit and receive the signals.

BBC: Public Petitions Committee

Even something too small to emit visible light will probably give off radio waves and infra-red radiation (Jupiter does).

ECONOMIST: X marks the spot

Medium-size M-class flares can cause brief radio blackouts in the polar regions and occasional minor radiation storms.

MSN: Big sunspot unleashes an intense solar flare

With knowledge, however, otherwise worthless matter and radiation turns into petroleum, microchips, and radio spectrum.

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West Virginia-based Schiffler Cancer Center radiation oncologist Gregory Merrick says it will revolutionize how radio seed therapy is done.

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They can cause long-lasting radiation storms in our planet's upper atmosphere and trigger radio blackouts.

MSN: Big sunspot unleashes an intense solar flare

Many shieldmakers claim to eliminate nearly all handset radiation a dubious assertion because that would effectively squelch the phone's radio signal.

FORBES: Shield sham

The radiation just spread out into space - where it still is and can be detected as weak waves of radio frequency.

BBC: Pictures of the early Universe