The National Toxicology Program (NTP), a division of the National Institutes of Health (NIH), has found a link between the type of radiation emitted by cell phones and cancer in rats. The project has been underway for more than a decade, and with a $25 million price tag, is the most expensive ever undertaken by the program.
By comparison, the current study, which found the same types of tumors in rats that the earlier epidemiological research found in humans, was a controlled clinical trial; it was specifically designed to simulate the exposures of cell phone users, and all of the important parameters were tightly controlled and carefully monitored. Rats and mice were exposed to the same kinds of radiation used in cell phones, for roughly nine hours each day, spread over the course of the day.
