Radiofrequency Radiation Dosimetry Handbook - Fourth Edition

Table 10.5 Specification of Parameters Used in Calculating SAR60

Parameters for a Standard
Physiological Man
Symbol and Numerical
Value
Mass w = 70 kg
Height h = 1.75 m
Surface area AD = 1.85 m2
Convection, radiation area Ar = Ac = 1.3 m2
Wetted area Aw = 1.7 m2
Rate of metabolic heat production M
Sitting at rest
M = 110 W or 1.57 W/kg
With thermal stress, Tre = 37C
M = 120 W or 1.71 W/kg
At Tre = 39.2° C
M = 153 W or 2.18 W/kg
Average M over 1-h period
M = 137 W or 1.96 W/kg
Critical rectal temperture Tre = 39.2 C
Normal rectal temperature Tre = 37°C
Specific heat of body cp = 0.83 (kcal/ °C kg)
Psychrometric Conditions Symbol and Numerical
Value
Wind velocity v = 1.35 m/s
Evaporation coefficient he = 21 W(m2 · torr)
Convective coefficient hc = 9.5 W/ (m2· °C)
Radiation coefficient hr = 8 W/(m2· °C)
Ambient temperature range Ta = 30 to 68° C
Relative humidity a = 0.8, 0.5, 0.2
Saturated ambient water-vapor pressure Pwa = is given in referenced tables in units of
torr as a function of Ta
Ambient water-vapor pressure Pa = a · Pwa
Saturated skin-vapor pressure Psk is given in referenced tables in units of
torr as a function Tsk