In this case, the Hand reaches max SAR limits before the head. In A Hospital Environment Cell Phone Transmitting Exposure. Evaluation of a power deposition on the body surface from a cellular phone transmitting inside a hospital room. The cells are connected by gap junctions - areas of the cell membrane that are of increased conductivity. Due to that only one octant of space needs to be modeled.
Gap junction connecting the two cells is located in the octant corner.
Color shows the potential distribution in the membrane. The red in the figure represents 1.2 microvolts and the blue is zero. Due to symmetry, only one octant which contains one full cell needs to be modeled. Gap junctions are shown as small circles in the cell walls touching the adjacent cells. Red in the figure represents current density of 1.5 mA per square meter while the blue is zero.