Cell phone users can now see how much radiation they may be exposed to by checking their phone against an online database.
The database, created by the Environmental Working Group in Washington D.C., ranks more than 1,000 cell phones by the amount of radiation they emit.
In terms of handsets currently on the market, manufacturer Samsung came out on top with five phones in the list of 10 lowest emitters.
However it appears the specific handset model is more important than the brand when it comes to radiation.
Motorola's RAZR V8 was ranked second in the list of lowest emitters — but there were also five Motorola phones at the other end of the scale.
Similarly, the BlackBerry Storm 9530 was ranked 12th in the list of lowest emitters, but the BlackBerry Bold 9000 and two BlackBerry Curve models were among the highest.
Only three of the 10 top-ranked phones are currently available in Australia – the LG Xenon, Motorola RAZR V8 and T-Mobile Sidekick. The T-Mobile Sidekick was released locally as the Telstra HipTop Slide.
How were they ranked?
The handsets were ranked on a measurement called the specific absorption rate, or SAR, that gauges how much energy a person absorbs while using or wearing a phone. A handset's SAR is expressed in watts per kilogram (W/kg).
Should you be worried?
The Environmental Working Group says it created the database after recent studies linked using cell phones for more than a decade with health risks including brain tumors.
"Recent research has prompted serious concerns about exposure to wireless emissions," it says.
"We at Environmental Working Group are still using our cell phones, but we also believe that until scientists know much more about cell phone radiation, it’s smart for consumers to buy phones with the lowest emissions."
However most authorities maintain there has been no conclusive link made between phone radiation and health problems.