No effects of short-term GSM mobile phone radiation on cerebral blood flow measured using positron emission tomography.

The present study investigated the effects of 902 4 MHz global system for mobile communications GSM mobile phone radiation on cerebral blood flow using positron emission tomography PET with the 15 O water tracer Fifteen young healthy right handed male subjects were exposed to phone radiation from three different locations left ear right ear forehead and to sham exposure to test for possible exposure effects on brain regions close to the exposure source Whole brain O H O PET images were acquired 12 times 3 for each condition in a counterbalanced order Subjects were exposed for 5 min in each scan while performing a simple visual vigilance task Temperature was also measured in the head region forehead eyes cheeks ear canals during exposure The exposure induced a slight temperature rise in the ear canals but did not affect brain hemodynamics and task performance The results provided no evidence for acute effects of short term mobile phone radiation on cerebral blood flow