Quantitative Relationship between Whole Body Averaged SARs and Voxel SARs in Numerical Human Models of Pregnant Woman and 3-years Child for Far-Field Exposure

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  • Asayama Ryota
    Graduate School of Engineering, Nagoya Institute of Technology
  • Wang Jianqing
    Graduate School of Engineering, Nagoya Institute of Technology
  • Fujiwara Osamu
    Graduate School of Engineering, Nagoya Institute of Technology

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  • 遠方界ばく露の妊婦と子供に対する人体数値モデルにおける全身平均SARとボクセルSARの定量関係
  • エンポウカイ バクロ ノ ニンプ ト コドモ ニ タイスル ジンタイ スウチ モデル ニ オケル ゼンシン ヘイキン SAR ト ボクセル SAR ノ テイリョウ カンケイ

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Abstract

Safety standards and guidelines for radio-frequency exposure are being set based on whole-body averaged SARs (WBA-SARs) and localized average SARs. In Japan, the WBA-SAR and 1g localized average SAR are set at 0.4W/kg and at 8W/kg, respectively, except for the arms and legs and surface of body. The safety limits of WBA-SARs were determined from observing the behavior destruction of animals for radio-frequency exposure, but those of localized average SARs were determined under the assumption that a spatial peak SAR value does not exceed 20-fold WBA-SARs without their biological evidences. In this paper, to confirm whether or not the above assumption is valid, we calculated WBA-SARs and voxel SARs in the frequency range from 50MHz to 2GHz in anatomical-based human numerical models for pregnant woman and 3-years child for vertically and horizontally polarized far-field exposures, and derived the histogram and cumulative relative frequency of voxel SARs to obtain the quantitative relationship between WBA-SARs and voxel SARs. As a result, we found that 99.90-percentile voxel SARs are not exceeding 20-fold WBA-SARs, while 99.00-percentile voxel SARs are smaller than 10-fold WBA-SARs in both human models.

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