Objectives To investigate intensity of extremely low frequency magnetic field (ELFMF) emitted from cathode-ray tubes (CRT) of monitors in various directions and to find ways to avoid its influence.

• 目的 研究电脑阴极射线管显示器正前方不同距离和不同方位的极低频磁场(ELFMF)强度 ,就如何减少ELFMF的影响提出初步建议。