study 55 adult volunteers (mean age 30.7 years) were exposed or sham-exposed
to Rf radiation on two successive weekends. The exposure order was random.
The 30 minutes exposure using a GSM 895 MHz including 217 Hz pulse modulation.
The signal was of 0.25 W average power and the average SAR value measured
over 10 g of tissue was 0.674 W/kg. The experimenter and the subject were
blind to the exposure condition. Participants were instructed not to pass
urine after 20.00 hours. They were started on their 30-minute exposure
about 22.00 hours, and gave a urine sample at the end of the exposure
and at 06.00 hours the next morning. The concentration of 6-sulphatoxymelatonin
(6-OHMS) in the urine was determined.