高考英语 考前突破阅读理解能力 国际时事要闻 福岛核电站地下水受到放射污染PAGE福岛核电站地下水受到放射污染HighlevelsofatoxicradioactiveisotopehavebeenfoundingroundwateratJapan'sFukushimanuclearplant,itsoperatorsays.福岛核电站附近的地下水中发现高剂量有毒的放射性同位素。TokyoElectricPowerCompany(Tepco)saidtestsshowedstrontium-90waspresentat30timesthelegalrate.Theradioacti...
PAGE福岛核电站地下水受到放射污染HighlevelsofatoxicradioactiveisotopehavebeenfoundingroundwateratJapan'sFukushimanuclearplant,itsoperatorsays.福岛核电站附近的地下水中发现高剂量有毒的放射性同位素。TokyoElectricPowerCompany(Tepco)saidtestsshowedstrontium-90waspresentat30timesthelegalrate.Theradioactiveisotopetritiumhasalsobeendetectedatelevatedlevels.Theplant,crippledbythe2020earthquakeandtsunami,hasrecentlyseenaseriesofwaterleaksandpowerfailures.Thetsunamiknockedoutcoolingsystemstothereactors,whichmelteddown.WaterisnowbeingpumpedintothereactorstocoolthembutthishasleftTepcowiththeproblemofhowtosafelystorethecontaminatedwater.Therehavebeenseveralreportsofleaksfromstoragetanksorpipes.SeasamplesStrontium-90isformedasaby-productofnuclearfission.TestsshowedthatlevelsofstrontiumingroundwaterattheFukushimaplanthadincreased100-foldsincetheendoflastyear,ToshihikoFukuda,aTepcoofficial,toldmedia.MrFukudasaidTepcobelievedtheelevatedlevelsoriginatedfromaleakofcontaminatedwaterinApril2020fromoneofthereactors."Asit'snearwheretheleakfromreactornumbertwohappenedandtakingintoaccountthesituationatthetime,webelievethatwaterleftoverfromthattimeisthehighestpossibility,"hesaid.Tritium,usedinglow-in-the-darkwatches,wasfoundateighttimestheallowablelevel.MrFukudasaidthatsamplesfromtheseashowednoriseineithersubstanceandthecompanybelievedthegroundwaterwasbeingcontainedbyconcretefoundations."Whenwelookattheimpactthatishavingontheocean,thelevelsseemtobewithinpasttrendsandsowedon'tbelieveit'shavinganeffect."Butthediscoveryisanotherset-backforTepco'splantopumpgroundwaterfromtheplantintothesea,correspondentssay.NuclearchemistMichiakiFurukawatoldReutersnewsagencythatTepcoshouldnotreleasecontaminatedwaterintotheocean."Theyhavetokeepitsomewheresothatitcan'tescapeoutsidetheplant,"hesaid."Tepconeedstocarryoutmoreregulartestinginspecificareasanddiscloseeverythingtheyfind."TheFukushimapowerplanthasfacedaseriesofproblemsthisyear.Earlythismonth,radioactivewaterwasfoundleakingfromastoragetank.Theplantalsosufferedthreepowerfailuresinfiveweeksearlierthisyear.Aleakofradioactivewaterfromoneoftheplant'sundergroundstoragepoolswasalsodetectedinApril.
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