Outdoor measurement of SAR in a full-sized human model exposed to 29.9 MHz in the near field.
Localized and averaged specific absorption rates (SARs) were obtained in a full-size muscle-equivalent human model exposed to near-field 29.9 MHz irradiation at an outdoor facility. The model was positioned erect on a metallic groundplane 1.22 m (4 ft) from the base of a 10.8-m (35 ft) whip antenna with an input power of 1.0 kW. For whole-body SAR, a mean value of 0.83 W/kg was determined using two gradient-layer calorimeters in a twin-well configuration. The localized SARs at 12 body locations were measured using nonperturbing temperature probes and were highest in the ankle region. We conclude that averaged SAR measurements in a full-size phantom are feasible using a twin-calorimeter approach; measurements in the field are practical when human-size (183 x 61 x 46 cm) calorimeters are used.
Olsen
R G
RG
Bioenvironmental Assessment Department, Naval Aerospace Medical Research Laboratory, Pensacola, Florida 32508-5700.
Griner
T A
TA
D000042:Absorption; D002151:Calorimetry; D055590:Electromagnetic Phenomena; D004781:Environmental Exposure; D006801:Humans; D008872:Microwaves; D008961:Models, Structural; D013696:Temperature; D014916:Whole-Body Irradiation