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澳门金沙官方登录网址:Mobile phones to carry radiation data

作者:羊舌厨    发布时间:2019-03-06 05:14:00    

By Will Knight Mobile phone manufacturers have backed a new international standard for measuring the amount of radiation a mobile phone user could absorb. Nokia, Ericsson and Motorola plan to include the measurements in the European handset manuals of new phones for the first time. The testing involves a model of a human head filled with a liquid designed to have similar conductive properties to the brain. This is exposed to mobile phone radiation. Specially designed probes detect the electric field strength inside the head. In the past, different types of liquid or models were used, making it very difficult to compare results. The new standard specifies the shape of head and the composition of the liquid. It also outlines where a phone should be placed and how many tests should be conducted. The precise relationship between mobile phone radiation and human health remains unclear, but there are internationally agreed safe levels for mobile phone radiation. Absorption can be estimated from laboratory simulations and represented by a number known as the Specific Absorption Rate (SAR). Manufacturers say that phones fall well below maximum levels but consumer groups and phone users have still called for this information to be included with handsets. SAR results have been included with US mobile phones since the end of 2000 but the new regulation will bring European and US regulations for measuring radiation absorption much closer together. The standard, developed by the European Committee for Electrotechnical Standardisation (CENELEC), creates a system by which all phones can be measured. Experts welcome this synchronisation but say that measurements must not be hidden inside mobile phone boxes. “It’s really got to be on the outside [of the packaging],” says Mike Manning, head of testing laboratory SARTest in Surrey, England. “Otherwise you have to buy a phone before you can read it.” Nokia spokesman Tapio Hedman says that results will be not be put on phone packaging because this could actually mislead customers. “It has to be put in context in the user manual,” he told New Scientist. “Although different models may have different SAR level, this doesn’t mean one is more safe.” European and US testing methods still differ in one key respect. The US approach recommends analysing the one gram of tissue where the electric field is strongest, while the new European standard recommends finding the most effected 10 gram unit. Manning says that measuring a larger area could neglect concentrations of absorption. Nevertheless, Manning believes that the new standard takes into account the latest laboratory methods. “The new standard is pretty exhaustive and comprehensive,” he says. Another expert cautions that testing radiation absorption is a difficult procedure. Roy Brooker, who conducted tests on hands-free mobile phone kits for the UK Consumer Association in April 2000, says a host of environmental factors, such as the introduction of prosthetic hand, can affect measurements. “They appear to be subtle, but can have quite a dramatic effect on the end results,

 

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