LGUS990 User Manual

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137

Safety

decreasesrapidlywithincreasingdistancefromthesource.Theso-called

“cordlessphones,”whichhaveabaseunitconnectedtothetelephone

wiringinahouse,typicallyoperateatfarlowerpowerlevels,andthus

produceRFexposuresfarbelowtheFCCsafetylimits.

4. What are the results of the research done already?

Theresearchdonethusfarhasproducedconictingresults,andmany

studieshavesufferedfromawsintheirresearchmethods.Animal

experimentsinvestigatingtheeffectsofRadioFrequency(RF)energy

exposurescharacteristicofwirelessphoneshaveyieldedconictingresults

thatoftencannotberepeatedinotherlaboratories.Afewanimalstudies,

however,havesuggestedthatlowlevelsofRFcouldacceleratethe

developmentofcancerinlaboratoryanimals.However,manyofthestudies

thatshowedincreasedtumordevelopmentusedanimalsthathadbeen

geneticallyengineeredortreatedwithcancercausingchemicalssoastobe

pre-disposedtodevelopcancerintheabsenceofRFexposure.Other

studiesexposedtheanimalstoRFforupto22hoursperday.These

conditionsarenotsimilartotheconditionsunderwhichpeopleuse

wirelessphones,sowedonotknowwithcertaintywhattheresultsof

suchstudiesmeanforhumanhealth.Threelargeepidemiologystudies

havebeenpublishedsinceDecember2000.Betweenthem,

thestudies

investigatedanypossibleassociationbetweentheuseofwirelessphones

andprimarybraincancer,glioma,meningioma,oracousticneuroma,

tumorsofthebrainorsalivarygland,leukemia,orothercancers.Noneof

thestudiesdemonstratedtheexistenceofanyharmfulhealtheffectsfrom

wirelessphoneRFexposures.However,noneofthestudiescananswer

questionsaboutlong-termexposures,sincetheaverageperiodofphone

useinthesestudieswasaroundthreeyears.

5. What research is needed to decide whether RF exposure from

wireless phones poses a health risk?

Acombinationoflaboratorystudiesandepidemiologicalstudiesofpeople

actuallyusingwirelessphoneswouldprovidesomeofthedatathatare

needed.Lifetimeanimalexposurestudiescouldbecompletedinafew

years.However,verylargenumbersofanimalswouldbeneededtoprovide

reliableproofofacancerpromotingeffectifoneexists.Epidemiological

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User Manual - Page 137