35OccupationalSafetyandHealthAdmin.,Labor§1926.54TABLED–2—PERMISSIBLENOISEEXPOSURESDurationperday,hoursSoundleveldBAslowresponse8.........................................................................906.........................................................................924.........................................................................953.........................................................................972.........................................................................10011⁄2.....................................................................1021.........................................................................1051⁄2.......................................................................1101⁄4orless...........................................................115(2)(i)Whenthedailynoiseexposureiscomposedoftwoormoreperiodsofnoiseexposureofdifferentlevels,theircombinedeffectshouldbeconsidered,ratherthantheindividualeffectofeach.Exposuretodifferentlevelsforvariousperiodsoftimeshallbecom-putedaccordingtotheformulasetforthinparagraph(d)(2)(ii)ofthissec-tion.(ii)Fe=(T1/L1)+(T2/L2)+···+(Tn/Ln)Where:Fe=Theequivalentnoiseexposurefactor.T=Theperiodofnoiseexposureatanyes-sentiallyconstantlevel.L=Thedurationofthepermissiblenoiseex-posureattheconstantlevel(fromTableD–2).IfthevalueofFeexceedsunity(1)theexposureexceedspermissiblelevels.(iii)Asamplecomputationshowinganapplicationoftheformulainpara-graph(d)(2)(ii)ofthissectionisasfol-lows.Anemployeeisexposedattheselevelsfortheseperiods:110dbA1⁄4hour.100dbA1⁄2hour.90dbA11⁄2hours.Fe=(1⁄4/1⁄2)+(1⁄2/2)+(11⁄2/8)Fe=0.500+0.25+0.188Fe=0.938SincethevalueofFedoesnotexceedunity,theexposureiswithinpermis-siblelimits.(e)Exposuretoimpulsiveorimpactnoiseshouldnotexceed140dBpeaksoundpressurelevel.§1926.53Ionizingradiation.(a)Inconstructionandrelatedac-tivitiesinvolvingtheuseofsourcesofionizingradiation,thepertinentprovi-sionsoftheNuclearRegulatoryCom-mission’sStandardsforProtectionAgainstRadiation(10CFRpart20),re-latingtoprotectionagainstoccupa-tionalradiationexposure,shallapply.(b)AnyactivitywhichinvolvestheuseofradioactivematerialsorX-rays,whetherornotunderlicensefromtheNuclearRegulatoryCommission,shallbeperformedbycompetentpersonsspeciallytrainedintheproperandsafeoperationofsuchequipment.InthecaseofmaterialsusedunderCommis-sionlicense,onlypersonsactuallyli-censed,orcompetentpersonsunderdi-rectionandsupervisionofthelicensee,shallperformsuchwork.(c)–(r)[Reserved]NOTE:Therequirementsapplicabletocon-structionworkunderparagraphs(c)through(r)ofthissectionareidenticaltothosesetforthatparagraphs(a)through(p)of§1910.1096ofthischapter.[44FR8577,Feb.9,1979;44FR20940,Apr.6,1979,asamendedat61FR5510,Feb.13,1996;61FR31431,June20,1996]§1926.54Nonionizingradiation.(a)Onlyqualifiedandtrainedem-ployeesshallbeassignedtoinstall,ad-just,andoperatelaserequipment.(b)Proofofqualificationofthelaserequipmentoperatorshallbeavailableandinpossessionoftheoperatoratalltimes.(c)Employees,whenworkinginareasinwhichapotentialexposuretodirectorreflectedlaserlightgreaterthan0.005watts(5milliwatts)exists,shallbeprovidedwithantilasereyeprotec-tiondevicesasspecifiedinsubpartEofthispart.(d)Areasinwhichlasersareusedshallbepostedwithstandardlaserwarningplacards.(e)Beamshuttersorcapsshallbeutilized,orthelaserturnedoff,whenlasertransmis...
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