Realizing Highly Localized Exposure in Small Animals with Absorbing Material Covered Holder to Test Biological Effects of 1.5 GHz Cellular Telephones

摘要

In testing the possible biological effects of electromagnetic exposure from cellular telephones in small animals such as mice, it is essential to realize a highly localized head exposure as close as possible to that due to cellular telephones in humans. In this study, a 1.5 GHz exposure setup was developed which has a highly localized specific absorption rate (SAR) of 2 W/kg in the mouse brain and a low whole-body averaged SAR of 0.27 W/kg. The low whole-body averaged SAR was realized by using a flexible magnetic sheet attachment on the mouse holder. Its validity has been carefully examined by both numerical simulation with an anatomically based mouse model and experimental simulation with a solid mouse phantom. Good agreement was obtained between the numerical and experimental results, which confirmed the effectiveness of the magnetic sheet attachment to the mouse holder.