Children's exposure to magnetic fields produced by U.S. television sets used for viewing programs and playing video games.
Children's exposure to magnetic fields produced by U.S. television sets used for viewing programs and playing video games.
复制标题
儿童接触用于观看节目和玩视频游戏的美国电视机产生的磁场。
DOI：
10.1002/(sici)1521-186x(200004)21:3
复制
发表时间：
2000
影响因子：
1.9
通讯作者：
Haines,C
中科院分区：
文献类型：
--
作者：
Kaune,WT;Miller,MC;Linet,MS;Hatch,EE;Kleinerman,RA;Wacholder,S;Mohr,AH;Tarone,RE;Haines,C
两项流行病学研究报告称，儿童白血病的风险增加与儿童观看电视节目或玩电视机视频游戏的时间有关。为了评估这些活动产生的磁场暴露，在华盛顿及其马里兰州郊区进行的一项实地研究中，对儿童观看电视节目所用的72台电视机和玩视频游戏所用的34台电视机产生的静态、ELF和VLF磁场进行了表征。由此产生的电视特定磁场数据与通过问卷收集的信息相结合，以估计与看电视和玩视频游戏相关的磁场暴露水平。由此计算的极低频和甚低频暴露水平的几何平均值，对于看电视节目的儿童分别为0.0091和0.0016 μT，对于玩电子游戏的儿童分别为0.023和0.0038 μT。电视机关闭时，环境ELF和VLF水平的几何平均值分别为0.10和0.0027 μT。在ELF频率范围（6-3066 Hz）上求和，与环境水平相比，暴露水平较小。然而，在有限的极低频频率范围（120赫兹和606-3066赫兹）和甚低频波段，电视暴露水平相当于或大于正常环境水平。即便如此，电视场的120 Hz或606-3066 Hz分量的强度相对于整体环境水平来说很小。因此，我们的研究结果几乎没有支持儿童白血病和暴露于电视机产生的ELF磁场之间的联系。我们的研究结果表明，任何未来的研究可能对健康的影响，从电视机的磁场可能集中在电视机产生的VLF电场和磁场，因为他们的增强能力相对于O ELF场感应电流。Bioelectromagnetics 21：214-227，2000.© 2000 Wiley利斯公司
Two epidemiologic studies have reported increased risk of childhood leukemia associated with the length of time children watched television (TV) programs or played video games connected to TV sets. To evaluate magnetic field exposures resulting from these activities, the static, ELF, and VLF magnetic fields produced by 72 TV sets used by children to watch TV programs and 34 TV sets used to play video games were characterized in a field study conducted in Washington DC and its Maryland suburbs. The resulting TV‐specific magnetic field data were combined with information collected through questionnaires to estimate the magnetic field exposure levels associated with TV watching and video game playing. The geometric means of the ELF and VLF exposure levels so calculated were 0.0091 and 0.0016 μT, respectively, for children watching TV programs and 0.023 and 0.0038 μT, respectively, for children playing video games. Geometric means of ambient ELF and VLF levels with TV sets turned off were 0.10 and 0.0027 μT, respectively. Summed over the ELF frequency range (6–3066 Hz), the exposure levels were small compared to ambient levels. However, in restricted ELF frequency ranges (120 Hz and 606–3066 Hz) and in the VLF band, TV exposure levels were comparable to or larger than normal ambient levels. Even so, the strengths of the 120 Hz or 606–3066 Hz components of TV fields were small relative to the overall ambient levels. Consequently, our results provide little support for a linkage between childhood leukemia and exposure to the ELF magnetic fields produced by TV sets. Our results do suggest that any future research on possible health effects of magnetic fields from television sets might focus on the VLF electric and magnetic fields produced by TV sets because of their enhanced ability relative t o ELF fields to induce electric currents. Bioelectromagnetics 21:214–227, 2000. © 2000 Wiley‐Liss, Inc.