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首页> 外文期刊>Bioelectromagnetics. >Children's exposure to magnetic fields produced by U.S. television sets used for viewing programs and playing video games.
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Children's exposure to magnetic fields produced by U.S. television sets used for viewing programs and playing video games.

机译：儿童暴露于美国电视机产生的磁场中，这些电视机用于观看节目和玩电子游戏。

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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 microT, respectively, for children watching TV programs and 0.023 and 0.0038 microT, 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 microT, 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 to ELF fields to induce electric currents. Copyright 2000 Wiley-Liss, Inc.
机译：两项流行病学研究报告说，儿童观看电视节目或玩与电视机相连的视频游戏的时间越长，儿童患白血病的风险就越高。为了评估由这些活动引起的磁场暴露，在华盛顿特区进行的一项野外研究中，对由儿童观看电视节目的72台电视机和用于玩电子游戏的34台电视机产生的静磁场，ELF和VLF磁场进行了表征。及其马里兰州郊区。将所得的特定电视磁场数据与通过问卷调查收集的信息相结合，以估计与观看电视和玩视频游戏相关的磁场暴露水平。这样计算得出的看电视节目的儿童的ELF和VLF暴露水平的几何平均值分别为0.0091和0.0016 microT，而玩电子游戏的儿童分别为0.023和0.0038 microT。电视机关闭时，环境ELF和VLF的几何平均值分别为0.10和0.0027 microT。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。但是，在受限的ELF频率范围（120 Hz和606-3066 Hz）中以及在VLF频段中，TV暴露水平与正常环境水平相当或更高。即使这样，相对于整体环境水平，电视场的120 Hz或606-3066 Hz分量的强度也很小。因此，我们的结果几乎没有支持儿童白血病与电视机所产生的ELF磁场的暴露之间的联系。我们的结果确实表明，关于电视机磁场可能对健康产生的影响的任何未来研究都可能集中在电视机产生的VLF电场和磁场上，因为它们相对于ELF场增强了感应电流的能力。版权所有2000 Wiley-Liss，Inc.

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