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1、NCRPREPORTNo.151StructuralShieldingDesignandEvaluationforMegavoltageX-andGamma-RayRadiotherapyFacilitiesRecommendationsoftheNATIONALCOUNCILONRADIATIONPROTECTIONANDMEASUREMENTSDecember31,2005NationalCouncilonRadiationProtectionandMeasurements7910WoodmontAvenue,Suite40
2、0/Bethesda,MD20814-3095©NCRP2006-Allrightsreserved.LicensedtozengzhiDownloaded06/20/06Singleuserlicenseonly,copyingandnetworkingprohibited.LEGALNOTICEThisReportwaspreparedbytheNationalCouncilonRadiationProtectionandMeasurements(NCRP).TheCouncilstrivestoprovideaccurat
3、e,completeanduse-fulinformationinitsdocuments.However,neitherNCRP,themembersofNCRP,otherpersonscontributingtoorassistinginthepreparationofthisReport,noranypersonactingonthebehalfofanyoftheseparties:(a)makesanywarrantyorrep-resentation,expressorimplied,withrespecttoth
4、eaccuracy,completenessoruse-fulnessoftheinformationcontainedinthisReport,orthattheuseofanyinformation,methodorprocessdisclosedinthisReportmaynotinfringeonpri-vatelyownedrights;or(b)assumesanyliabilitywithrespecttotheuseof,orfordamagesresultingfromtheuseofanyinformati
5、on,methodorprocessdisclosedinthisReport,undertheCivilRightsActof1964,Section701etseq.asamended42U.S.C.Section2000eetseq.(TitleVII)oranyotherstatutoryorcommonlawtheorygoverningliability.DisclaimerAnymentionofcommercialproductswithinNCRPpublicationsisforinforma-tiononl
6、y;itdoesnotimplyrecommendationorendorsementbyNCRP.LibraryofCongressCataloging-in-PublicationDataNationalCouncilonRadiationProtectionandMeasurements.Structuralshieldingdesignandevaluationformegavoltagex-andgamma-rayradiotherapyfacilities:recommendationsoftheNationalCo
7、uncilonRadiationProtectionandMeasurements.p.cm.—(NCRPreport;no.151)“IssuedDecember2005.”Includesbibliographicalreferencesandindex.ISBN-13:978-0-929600-87-1ISBN-10:0-929600-87-81.Radiology,Medical—Equipmentandsupplies—Safetymeasures.2.Shielding(Radiation)3.Radiotherap
8、y—Safetymeasures.4.Gammarays—Physiologicaleffect.5.Radiology,Medical—Safetymeasures.I.Title.II.Series.RA975.5.R3S772005616.07’572--
