Use of hardware modified phones for exposure assessment in health studies in Australia: verification of compliance with standards.
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Date
2009-07-23
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Abstract
Most epidemiological studies investigating health effects of mobile telephone use have been criticised for poor quality of exposure assessment Most used questionnaires which have limited precision to assess exposure Clearly more relevant and direct methods of exposure assessment are needed We describe the calibration of hardware modified phones HMPs for exposure assessment and dosimetry and verified their compliance with Australian and international standards Specific energy absorption rate SAR values at various tilts and rotations and their combinations were obtained for the HMPs using a DASY3 SAR measuring system Calibration involved placing HMPs on human head phantoms and taking measurements at 900 and 1800 MHz bands on right and left sides of the phantom At 900 MHz the maximum SAR obtained with HMPs at the touch position was 0 9 W kg and 0 4 W kg at 30 degrees tilt but at 1800 MHz SAR at the touch and 30 degrees tilts were 1 1 W kg and 1 3 W kg respectively Whilst tilt and rotation each had an effect on SAR at constant frequency no interaction was observed with rotation and frequency however one was observed between tilt and frequency At 1800 MHz mean SAR at 30 degrees tilt was 0 22 W kg higher 95 CI 0 15 0 30 than at 0 degrees whereas at 900 MHz mean SAR at 30 degrees tilt was 0 60 W kg lower 95 CI 0 52 0 67 than at 0 degrees Our results indicated that tilts influence SAR more than rotations SAR values obtained at both 900 1800 MHz for the HMPswere well below ICNIRP limits for the general public The phones were compliant with both international and Australian standards