this 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.