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电磁场通常被认为是无害的。但是,近年来一些科学家提出了电磁场的安全问题,说可能与癌症,特别是儿童白血病有关,引起人们的关切。电磁场对人体健康究竟有无影响,科学家中争论的焦点主要是普通家用电器形成的电磁场。X射线和伽马射线的强度足以使活细胞中的分子产生分裂,这也是为什么X射线可能引起基因突变、癌症和先天缺陷的原因。微波的强度不足以破坏分子,但它被吸收所产生的热能也能伤害人体细胞组织。因此,微波器具必须有金属屏蔽作为防护。而普通家用电器形成的电磁场是否也会对健康产生危害,现在还没有确定的证据。在科学寻求答案的时候,我们不妨采取各种简易的预防措施,使可能遇到的电磁场辐射减小到最低程度。看电视时至少距离1.8 m,操作电脑时距荧光屏一臂之远,不必将微波炉视为威胁,但也不应让婴儿靠近它。睡眠时也不应将电闹钟放在枕边。
Electromagnetic fields are generally considered harmless. However, in recent years, some scientists have raised the issue of the safety of electromagnetic fields and said that they may be related to cancer, especially childhood leukemia, arousing people’s concern. Electromagnetic field on human health whether or not the impact of scientists in the main focus of controversy is the formation of ordinary household appliances electromagnetic field. X-rays and gamma rays are strong enough to break apart molecules in living cells, which is why X-rays can cause mutations, cancers and birth defects. Microwaves are not strong enough to destroy molecules, but the energy they absorb is also damaging to human cells and tissues. Therefore, microwave appliances must have a metal shield as a protection. However, whether the electromagnetic fields formed by ordinary household appliances may also cause health hazards, there is no conclusive evidence yet. In the scientific search for answers, we may wish to take a variety of simple preventive measures to minimize the electromagnetic radiation may encounter. When watching TV at least distance 1.8 m, when operating the computer arm away from the screen, do not have the microwave as a threat, but should not let the baby close to it. Do not put the electric alarm on the pillow while sleeping.