Important Precautionary Advice Regarding Cell Phone Use

Practical Advice to Limit Exposure to Electromagnetic Radiation Emitted from Cell Phones

1. Do not allow children to use a cell phone, except for emergencies. The developing organs of a fetus or child are the most likely to be sensitive to any possible effects of exposure to electromagnetic fields.
2. While communicating using your cell phone, try to keep the cell phone away from the body as much as possible. The amplitude of the electromagnetic field is one fourth the strength at a distance of two inches and fifty times lower at three feet. Whenever possible, use the speaker-phone mode or a wireless Bluetooth headset, which has less than 1/100th of the electromagnetic emission of a normal cell phone. Use of a hands-free ear piece attachment may also reduce exposures.
3. Avoid using your cell phone in places, like a bus, where you can passively expose others to your phone's electromagnetic fields.
4. Avoid carrying your cell phone on your body at all times. Do not keep it near your body at night such as under the pillow or on a bedside table, particularly if pregnant. You can also put it on “flight” or “off-line” mode, which stops electromagnetic emissions.
5. If you must carry your cell phone on you, make sure that the keypad is positioned toward your body and the back is positioned toward the outside so that the transmitted electromagnetic fields move away from your rather than through you.
6. Only use your cell phone to establish contact or for conversations lasting a few minutes, as the biological effects are directly related to the duration of exposure.
   For longer conversations, use a land line with a corded phone, not a cordless phone, which uses electromagnetic emitting technology similar to that of cell phones.
7. Switch sides regularly while communicating on your cell phone to spread out your exposure. Before putting your cell phone to the ear, wait until your correspondent has picked up. This limits the power of the electromagnetic field emitted near your ear and the duration of your exposure.
8. Avoid using your cell phone when the signal is weak or when moving at high speed, such as in a car or train, as this automatically increases power to a maximum as the phone repeatedly attempts to connect to a new relay antenna.
9. When possible, communicate via text messaging rather than making a call, limiting the duration of exposure and the proximity to the body.
10. Choose a device with the lowest SAR possible (SAR = Specific Absorption Rate, which is a measure of the strength of the magnetic field absorbed by the body). SAR ratings of contemporary phones by different manufacturers are available by searching for “sar ratings cell phones” on the internet.

降低辐射危害的重要建议

Herberman博士的信里提出了十项降低手机辐射危害的建议和措施，包括：

1. 除了紧急状况，不要让小孩使用手机。胎儿和小孩正在发育的器官相对来说更容易受到电磁场辐射的影响。

2. 当使用手机时，尽量将手机远离身体。距离两英寸（约5.1厘米）远时，电磁场的强度仅仅是紧贴身体时的1/4，三英寸（约7.6厘米）时强度仅为1/50。尽可能的使用免提模式、耳机或者蓝牙耳机（蓝牙耳机的电磁辐射仅为手机的1/100）。

3. 避免在公共汽车上使用手机，因为公共汽车上的其他人可能受到你的手机辐射影响。

4. 避免一直随身携带手机。晚上不要将手机放在身边（包括枕头下或者床头桌）。孕妇特别要注意这一点。晚上可以将手机关机或者调到飞行模式。

5. 如果你一定要随身携带手机的话，注意将手机键盘朝向自己的身体，手机背面向外，这样手机电磁波就会向外传输，而不是透过身体传输。

6. 不要长时间连续使用手机，因为电磁波的生理影响和辐射的时间长度直接相关。如果需要长时间通话，尽量使用固定电话。无绳电话和手机采用相近的电磁传播技术，因此也要尽量避免长时间使用。

7. 用手机打电话时注意经常换边（比如从右耳换到左耳）。拨打电话时等对方接听之后才将手机放到耳边，这样可以减少电磁辐射的时间和强度。

8. 避免在信号弱或者高速移动时（比如在车里或者火车上）使用手机，因为这种情况下手机必须不断接入到新的基站，因此电磁波强度会增加到最大。

9. 尽可能使用短消息，而不是通过手机打电话。这样可以限制辐射的时间和电磁波到身体的距离。

10. 选择SAR值低的手机。SAR是Specific Absorption Rate（相关吸收值）的缩写，是衡量电磁场强度被身体吸收量的一个标准。在网上搜索“sar ratings cell phones”可以找到各种手机的SAR值。