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Dùng tai nghe bluetooth có hại không?

luckytwice28/01/2008 - 13:45

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Chắc các bạn còn nhớ vì sợ sóng di động không tốt cho não nên ta phải dùng ( có dây - dĩ nhiên ) Vậy bây giờ lại dùng tai nghe blue tooth ( không dây - dĩ nhiên ) mà lại để sát tai , vậy xin cho hỏi sóng của blue tooth có hại như sóng của di động không?
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BT

28/01/2008 - 15:08
Đừng dùng, hại gấp trăm lần sóng điện thoại đấy
Đừng dùng, hại gấp trăm lần sóng điện thoại đấy

maumelinhtinh

28/01/2008 - 15:00
Bluetooth and Health: The Radiation Issues
It is a matter of concern to some that the carrier waves used by Bluetooth inhabit the same band as that of microwave ovens. As being cooked inside a microwave oven would produce deleterious effects in most, should we be worried about standing in the path of a plethora of Bluetooth devices?

Fortunately, the transmitting power is far too weak to result in perceptible effects in humans. Moreover, the radiation is not concentrated in a single beam; rather, it is randomly dispersed in all directions. The penetration depth of a device working in the 2.4Ghz frequency range is about 1.5cm - nothing more than...
Bluetooth and Health: The Radiation Issues
It is a matter of concern to some that the carrier waves used by Bluetooth inhabit the same band as that of microwave ovens. As being cooked inside a microwave oven would produce deleterious effects in most, should we be worried about standing in the path of a plethora of Bluetooth devices?

Fortunately, the transmitting power is far too weak to result in perceptible effects in humans. Moreover, the radiation is not concentrated in a single beam; rather, it is randomly dispersed in all directions. The penetration depth of a device working in the 2.4Ghz frequency range is about 1.5cm - nothing more than a superficial absorption. The principal absorption mechanism is field-induced rotation of polar molecules (H2O for example) which generates heat through molecular 'friction'. It is however important to note that 2450Mhz is not a resonance frequency of water.

Heating by means of radio frequencies is possible over a broad frequency range. Microwave ovens exploit this phenomenon by using very high power levels (up to one million times greater than the power output of Bluetooth transmitters). So does exposure to Bluetooth radio frequency emission result in heating of the body? No, definitely not. The power output is far too low to result in any tangible increase. By way of comparison, the maximum increase in brain temperature through use of a mobile is 0.1ºC.

However, this assurance is not the same as saying that prolonged exposure to the Bluetooth RF will not produce negative effects in people. If Bluetooth becomes a truly ubiquitous technology, those of us living in cities and working in offices will presumably be exposed 24/7. This may not be a good thing.

Long exposure to strong fields results in some individuals becoming hypersensitive so that after a few years, they can no longer tolerate being near such fields. Bluetooth fits into a general development pattern where antennas for GSM transmission and other sources of electromagnetic radiation become more and more prevalent in our cities. The future will show whether this is a healthy development.
http://ntrg.cs.tcd.ie/undergrad/4ba2...p3/health.html


*************** *************** *************** ***********
Statement on Bluetooth and health
All Ericsson phone models are carefully designed and tested to comply with
relevant safety standards and government regulations regarding radio frequency
(RF) exposure. These worldwide standards take into account wide safety
margins. Extensive research over the course of many years has not established
any conclusive evidence of a link between adverse health effects and the use of
mobile phones meeting those standards and regulations.
BluetoothÔ wireless technology makes it possible to use short-range wireless
connections between mobile phones, laptops, printers, headsets, cameras and
many other devices at home or at work. With Bluetooth wireless technology,
cables are replaced by radio communications.
Bluetooth products contain small radio transmitters and receivers. The normal
output power is very low, only 1 mW (1/1000 of a watt), which gives a working
range of about 10 meters.
The maximum exposure levels from Bluetooth products are well below the
prescribed safety limits. Normal Bluetooth devices (1 mW) reach one hundredth
of the safety levels at the most.
The risk of Bluetooth devices causing electromagnetic interference in sensitive
electronic equipment, for example medical devices, is minimal because of the
very low output power.

Bluetooth and Health: The Radiation Issues
It is a matter of concern to some that the carrier waves used by Bluetooth inhabit the same band as that of microwave ovens. As being cooked inside a microwave oven would produce deleterious effects in most, should we be worried about standing in the path of a plethora of Bluetooth devices?

Fortunately, the transmitting power is far too weak to result in perceptible effects in humans. Moreover, the radiation is not concentrated in a single beam; rather, it is randomly dispersed in all directions. The penetration depth of a device working in the 2.4Ghz frequency range is about 1.5cm - nothing more than a superficial absorption. The principal absorption mechanism is field-induced rotation of polar molecules (H2O for example) which generates heat through molecular 'friction'. It is however important to note that 2450Mhz is not a resonance frequency of water.

Heating by means of radio frequencies is possible over a broad frequency range. Microwave ovens exploit this phenomenon by using very high power levels (up to one million times greater than the power output of Bluetooth transmitters). So does exposure to Bluetooth radio frequency emission result in heating of the body? No, definitely not. The power output is far too low to result in any tangible increase. By way of comparison, the maximum increase in brain temperature through use of a mobile is 0.1ºC.

However, this assurance is not the same as saying that prolonged exposure to the Bluetooth RF will not produce negative effects in people. If Bluetooth becomes a truly ubiquitous technology, those of us living in cities and working in offices will presumably be exposed 24/7. This may not be a good thing.

Long exposure to strong fields results in some individuals becoming hypersensitive so that after a few years, they can no longer tolerate being near such fields. Bluetooth fits into a general development pattern where antennas for GSM transmission and other sources of electromagnetic radiation become more and more prevalent in our cities. The future will show whether this is a healthy development.
http://ntrg.cs.tcd.ie/undergrad/4ba2...p3/health.html


*************** *************** *************** ***********
Statement on Bluetooth and health
All Ericsson phone models are carefully designed and tested to comply with
relevant safety standards and government regulations regarding radio frequency
(RF) exposure. These worldwide standards take into account wide safety
margins. Extensive research over the course of many years has not established
any conclusive evidence of a link between adverse health effects and the use of
mobile phones meeting those standards and regulations.
BluetoothÔ wireless technology makes it possible to use short-range wireless
connections between mobile phones, laptops, printers, headsets, cameras and
many other devices at home or at work. With Bluetooth wireless technology,
cables are replaced by radio communications.
Bluetooth products contain small radio transmitters and receivers. The normal
output power is very low, only 1 mW (1/1000 of a watt), which gives a working
range of about 10 meters.
The maximum exposure levels from Bluetooth products are well below the
prescribed safety limits. Normal Bluetooth devices (1 mW) reach one hundredth
of the safety levels at the most.
The risk of Bluetooth devices causing electromagnetic interference in sensitive
electronic equipment, for example medical devices, is minimal because of the
very low output power.
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