抄録
The WHO (World Health Organization) recommended the necessity of electromagnetic (EM) dosimetry evaluation for pregnant women with fetus and children as one of the most primary research subjects in 2006, which has promoted the studies on whole-body-average specific absorption rates (WBA-SARs) in various kinds of numerical pregnant woman and child models with respect to safety limits of WBA-SARs. For the present safety limits, however, they are being determined in view of the behavior destruction of health adult animals for radio-frequency EM exposure and EM absorption characteristics at resonant frequencies, which are not based on experiments for pregnant and young animals. In this paper, we calculated the voxel SARs and WBA-SARs in anatomical detailed models developed for a pregnant woman and a 3-years child at their resonant frequencies. The histograms and cumulative relative distributions of voxel SARs were also derived to determine the statistical outlier in voxel SARs for pregnant woman and 3-years child models. As a result, we found that the mean voxel SARs agree with the WBA-SARs, and that the medians of voxel SARs in the pregnant woman and 3-years child models are 47% and 55% of their means, respectively, while their peak voxel SARs are 70 times larger than both of the means. This suggests a possibility that the FDTD calculated WBA-SARs could be overestimated due to the existence of statistical outliers. It was also found that although the total number ratio of voxel SARs for the outliers is 0.36% for the pregnant woman model and 0.34% for the 3-years child model, WBA-SARs except for these outliers are less than those in the pregnant woman and 3-years child models by 6.8% and 5.7%, respectively.
