Fresh evidence that hands-free mobile phone kits can significantly boost the brain's exposure to radiation was published on Thursday, challenging U.K. government research amid consumer health concerns.

British consumer research magazine Which? said its new findings confirmed claims it first published in April that using hands-free earpieces could more than triple the brain's exposure to radiation compared to a conventional mobile phone call.

The original report was dismissed in August by the government, which commissioned research that showed the kits did cut exposure levels.

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