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1、Unit6AreCellPhonesSafe?LcomprehensionandAppreciation1.Areyouacellphoneuser?Howlongdoyoutalkonitperday?2.Whyisthereacontroversyastothesafetyofusingcellphones?Whatshouldwedoaccordingtotheexperts?Somestudieshavesuggestedthatfrequentuseofcellphonescausesincreasedriskof
2、brainandmouthcancers,othershavefoundnosuchlinks.Butsincecellphonesarerelativelynewandbraincancersgrowslowly,manyexpertsarenowrecommendingtakingstepstoreduceexposure.3.Whyarecellphoneusersabletochooseandinterprettheresultsofusingcellphonestheypreferandignoretheonest
3、heydorTt?Withsome4to5billioncellphonesnowinuseworldwideandhundredsofstudiesseekingevidenceoftheirhealtheffectspublishedinpeer-reviewedjournalsoverthelast10years,there9spreciouslittlescientificcertaintyoverwhethercellphonesposeanydangertothoseusingthem.Fornearlyever
4、ystudythatreportsaneffect,another,justascarefullyconducted,findsnone.4.Whyisitdifficulttoassesstheeffectsofcellphones?Theeffectsofcellphoneshaveprovendifficulttoassessbecausetheyarerelativelynew,thewayandtheamountthey9reusedcontinuestoevolve,andtheproblemsthatcellp
5、honesmightcausearehardtodetect.5.Whatkindofradiationdocellphonesproduce?IsthereanypotentialdamagetoDNA?Cellphonesproduce"non-ionizing^radiation,which,unlikeX-orgammarays,doesn^tdamageDNAbystrippingawayelectronsfrommoleculesincelltissue.Radiofrequencyenergydoes,howe
6、ver,produceheatand,athighenoughlevels,candamagecelltissue.6.BoththeUSFCCandtheICNIRPinEuropesetsomelimitsoncellphones9SAR,istherestillsomequestionremained?ItistruethattheUSFCCandtheICNIRPinEuropesetsomelimitsoncellphones'SAR——themeasureoftheamountofradiofrequencyen
7、ergyacellphoneuserabsorbs一at,respectively,1.6and2.0wattsperkilogram.However,therestillremainsthequestionwhetherthesestandardsaresufficienttoprotectagainstlong-termexposuresandwhetherthebuildupofheatincelltissuesismoredamagingwherethere'slessbloodflowtodissipateit,s
8、uchastheouterear,brain,skin,ortestes.7.WhatisthesubjectofCongressionalhearings?Andwhatkindofwarningdotheconsumergroupshavegot?Theexposurestandard
