Apr 7, 2010

Age Dependent Tissue-specific Exposure of Cell Phone Users

Andreas Christ, Marie-Christine Gosselin, Maria Christopoulou, Sven Kühn, and Niels Kuster, in Physics in Medicine and Biology, Volume 55, Issue 7, pp. 1767–1783, 7 April 2010, online March 5

Remaining questions regarding differences in the peak spatial average SAR (psSAR) of adults and children concern age dependent changes of the dielectric tissue properties and differences in proportions of the head and brain. This study shows that the psSAR in children can be significantly higher (>3 dB) in the surface layer of the cortex, in subregions of the brain and in the eye due to their closer proximity to the phone. An impact of age dependent changes of the tissue dielectrics could only be observed for local absorption in tissues whose parameters change significantly with age (>10 dB in bone marrow). No age-dependent changes as a function of the tissue dielectrics could be observed for the psSAR when averaged over all head tissues.