Brain SAR of average male Korean child to adult models for mobile phone exposure assessment.
PHYSICS IN MEDICINE AND BIOLOGY(2019)
摘要
This paper aims to implement average head models of Korean males and investigate age-related differences in the brain for exposure from radiation from mobile phones. Four male head models composed of a total of 69 structures were developed through a statistical investigation of the anatomical morphology for the age groups of 6, 9,15 and 20-24 years in age, which are named KR-6, KR-9, KR-15, and KR-22 herein. Three numerical bar phone models with a dual-band built-in antenna were applied to calculate the specific absorption rate (SAR) in the brain; the body lengths of models M-avg and M-long have the mean value and upper 5th percentile value of commercial bar phone models, respectively, with an antenna at the bottom, whereas M-rev has an antenna on top of the phone body, which is the same as in M-avg but rotated 180 degrees. The cheek and tilt positions were employed for SAR simulations. As a result, a higher peak spatial-average SAR (psSAR) was observed in the brain for the child groups of KR-6 and KR-9 than for the adult groups of KR-15 and KR-22. In most configurations, the position-averaged psSAR(10g) in the child brain was 62% (M-long, 835 MHz), 61% (M-avg, 835 MHz), 102% (M-long, 1850 MHz), 108% (M-avg, 1850 MHz), and 125 % (M-rev, 1850 MHz) higher than in the adult brain. The higher frequency of 1850 MHz showed a wider difference in the brain psSAR between the child and adult groups owing to the shorter penetration depth. When a long phone with an antenna at the bottom operates at a higher frequency, it significantly reduces the brain exposure.
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关键词
RF exposure,age,specific absorption rate,anatomical morphology
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