What is the electromagnetic field or radiation range of the mobile phone (several)

When the bell rings and the phone is dialed out, the radiation is the biggest.

In this mobile phone radiation detection, we selected two popular mobile phones in the market for experiments. Do three experiments in each case, take the maximum value and get the test results.

See the following table for details-

The first paragraph:

Instantaneous maximum (unit: volt/meter)

* Bare-metal call status outgoing call

5.33 9. 16 1-4

* Use Bluetooth headset to make incoming calls.

2.68 1.27 0.2x-0.3x

* Use wired headphones to make incoming calls

1.4 1.48 low

* send and receive SMS, send SMS and receive SMS.

2.99 2.90

* In the process of downloading GPRS on the Internet.

8. 16 2.x-6.x

* standby low level

The second paragraph:

Instantaneous maximum (unit: volt/meter)

* Exhale 10.09

Incoming call 1 1.39

On the phone 1-4

* Send SMS 3.5

Received SMS 3.34

* standby low level

Radiation intensity below 12 V/m is a safe range.

The radiation frequency of mobile phones is generally between 30 and 30-3000MHz. According to the national standard (GB8702-88) on electromagnetic radiation protection, for the public, "within 24 hours of a day, the average value of the field parameters of the environmental electromagnetic radiation field should be less than12v/m in any continuous 6 minutes".

Liu Yuezhou, deputy director of the radiation room of Hangzhou Environmental Monitoring Center Station, explained that if the electric field intensity exceeds 12 V/m for more than 6 minutes within 24 hours, it is regarded as "exceeding the standard".

Microwave ovens widely used in families emit a lot of radiation. At the experimental site, we tested a microwave oven with a power of 700 watts.

When working in the "high fire" state, the maximum instantaneous radiation reaches 18.57 volts/meter in the interval of about 10 cm from the microwave oven. The distance is about 1 m, and the radiation value fluctuates between1-2 v/m.

Avoid talking and surfing the internet for a long time with your mobile phone.

In fact, there is a certain amount of electromagnetic radiation in our daily life. For example, the radio frequency comprehensive field strength in the street is about 0.5- 1.0V/m, and the electric field strength of the signal sent by the wireless router used in citizens' homes is about 1-2V/m, so people have a certain tolerance to radiation, and their bodies also have the ability to repair themselves for a small amount of radiation damage. Under normal circumstances, normal use of wireless devices will not cause harm.

Does the electromagnetic radiation of mobile phones affect human health? Common mobile phones work in the frequency range of 800 MHz to 1800 MHz. This frequency band belongs to the microwave section of radio frequency. Like a microwave oven, the electromagnetic field of a mobile phone will have a thermal effect on the surrounding media, including human muscle tissue. Obviously, under the radiation of mobile phones for a long time, it is not a good thing.

For example, many men like to put their mobile phones in their close-fitting trouser pockets. Compared with women who put their mobile phones in their carry-on bags, the amount of radiation they receive is definitely greater.

Not long ago, some experts in China conducted this test, and the test results showed that the radiation of mobile phones was related to distance. If the mobile phone is far away, the radiation will drop; If you put your mobile phone close to your ear, you will feel your ear hot after listening for a long time. In our experiment, after using headphones to keep the mobile phone away from the body, the radiation dose did drop significantly.

(Note: For Bluetooth and wired headset testing, the probe is placed next to the headset, and the mobile phone is about 1 m away from the probe. The test range of the tester is 0. 1MHz-3000MHz. If the radiation value is less than 0.3 V/m, the tester will display "low". )

From the experimental results, when you receive a phone call, that is, the moment the bell rings, the radiation reaches its maximum, not the moment you press the answer key. During the call, the radiation remained stable. The amount of radiation generated when sending and receiving text messages and surfing the Internet is not less than that generated when making phone calls, and sometimes it is even stronger.

Tips for reducing radiation

The most effective way to control the radiation of mobile phones is to control the use time and distance. Experts from the monitoring station made several suggestions:

1, try not to put your mobile phone in your trouser pocket or pocket.

2. When sending and receiving text messages, try to stay away from your head and leave your body for a distance.

3. Use your mobile phone to surf the Internet, download as few big data files as possible, such as software or pictures, and stay away from your head.

4. If there are many calls every day, try to use wired headphones.

5. Try to use the fixed telephone when making a phone call.