高功率脉冲微波辐照大鼠体内场强的数值模拟

摘要

On the basis of setting up electromagnetic model of rat,FDTD method was used to calculating in vivo distribution of electric field intensity in the heart,liver and brain of rats irradiated by 2. 71 GHz and 9. 33 GHz HPPM. The results demonstrates that the descending order of field intensity in rats were heart, brain and liver by 2. 71 GHz HPPM irradiation from abdomen and lateral direction,and the descending order of 9. 33 GHz HPPM field intensity in rats were brain, liver and heart. The average field intensity of 2. 71 GHz HPPM in vivo was nearly quadruple of that of 9. 33 GHz HPPM. Our results show that the in vivo distribution of electric field intensity in rat varies with different organs, which is dependent of the frequency and incident direction of HPPM. Therefore, it requires analysis of in vivo distribution of electric field intensity in rat that studying biological effects of HPPM,in order to reasonably represent exposure dose of electromagnetic field which results in biological effects,and to acquire accurate quantitative relation between dose and effects of HPPM biological effects.%摘 要:文章在建立大鼠电磁模型的基础上,用时域有限差分法( FDTD)分别计算了2.71 GHz和9.33 GHz高功率脉冲微波(HPPM)辐照大鼠时,大鼠体内,尤其是心脏、肝脏、大脑等器官的电场强度分布.结果显示,2.71 GHz的HPPM腹部和侧部方向辐照时,大鼠各器官的场强从大到小依次为心脏、大脑、肝脏；9.33 GHz HPPM辐照时,场强从大到小依次为大脑、肝脏、心脏.并且相同功率密度的2.71 GHz的HPPM入射到大鼠体内的平均场强约为9.33 GHz HPPM的4倍.结果表明,脉冲微波入射到大鼠体内各器官的场强分布存在一定差异,并与微波的频率以及微波入射方向密切相关.因此,研究HPPM生物效应时,需深入分析生物体内部的场强分布,才能科学合理地表示产生生物效应的电磁辐射剂量,得到较正确的高功率脉冲微波生物效应的量效关系.