ETRI / 이애경*
Abstract
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°. 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 psSAR10 g 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.
Author information
Lee AK1, Park JS, Hong SE, Taki M, Wake K, Wiart J, Choi HD.
1
Radio Technology Research Department, Electronics and Telecommunications Research Institute (ETRI), Daejeon, 305-700, Republic of Korea. Author to whom any correspondence should be addressed.
편집위원
현대인에게 필수품이 되어버린 휴대폰에 의한 전자파가 뇌에 미치는 영향을 체계적으로 연구한 결과다. 특히 아동들에게 영향이 더 크게 미침을 다시 한 번 확인 할 수 있었고, 안테나의 위치와 휴대폰의 크기, 그리고 주파수에 따라 그 영향이 다를 수 있음을 알았다. 앞으로는 휴대폰을 살 때 길이가 길고 안테나가 아래에 달려있고 높은 주파수를 사용하는 휴대폰을 찾아보게 될 것 같다
2019-03-14 14:16:39