GB 11527-1989 车间空气中碳化硅粉尘卫生标准
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基本信息
| 标准名称： | 车间空气中碳化硅粉尘卫生标准 |
| 英文名称： | Hygienic standard for silicon carbide dust in the air of workplace |
| 中标分类： |
医药、卫生、劳动保护 >>
卫生 >>
劳动卫生 |
| ICS分类： |
环保、保健与安全 >>
空气质量 >>
工作场所空气
|
| 发布部门： | 中华人民共和国卫生部 |
| 发布日期： | 1989-03-29 |
| 实施日期： | 1990-02-01 |
| 首发日期： | 1989-06-20 |
| 作废日期： | 1900-01-01 |
| 主管部门： | 卫生部 |
| 归口单位： | 卫生部 |
| 起草单位： | 北京医科大学公共卫生学院 |
| 出版日期： | 1900-01-01 |
| 页数： | 1页 |
适用范围
本标准规定了车间空气中碳化硅粉尘的最高容许浓度及其监测检验方法。本标准适用于碳化硅磨料、磨具的生产及使用碳化硅粉料的各类企业。
前言
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目录
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引用标准
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所属分类： 医药 卫生 劳动保护 卫生 劳动卫生 环保 保健与安全 空气质量 工作场所空气
【英文标准名称】:StandardTestMethodforMeasuringReactionRatesbyAnalysisofBarium-140FromFissionDosimeters
【原文标准名称】:通过分析由裂变剂量计产生的钡140来测定反应速率的试验方法
【标准号】:ASTME393-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E10.05
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:Barium-140;fissiondosimeter;fissionproduct;fissionreactionrates;Barium;Fastneutronflux/fluence;Neutronactivationreactions;Radioactivation--fastneutronflux;Thresholddetectors--1.6MeV;Uranium-238fissionby-products
【摘要】:RefertoGuideE844fortheselection,irradiation,andqualitycontrolofneutrondosimeters.RefertoPracticeE261forageneraldiscussionofthemeasurementofneutronfluencerateandfluence.Theneutronspectrummustbeknowninordertomeasureneutronfluencerateswithasingledetector.Alsoitisnotedthatcrosssectionsarecontinuouslybeingreevaluated.ThelatestrecommendedcrosssectionsanddetailsonhowtheycanbeobtainedarediscussedinGuideE1018.Thereactionrateofadetectornuclideofknowncrosssection,whencombinedwithinformationabouttheneutronspectrum,permitsthedeterminationofthemagnitudeofthefluencerateimpingingonthedetector.Furthermore,ifresultsfromotherdetectorsareavailable,theneutronspectrumcanbedefinedmoreaccurately.ThetechniquesforfluencerateandfluencedeterminationsareexplainedinPracticeE261.140Baisaradioactivenuclideformedasaresultofuraniumfission.Althoughitisformedinfissionofanyheavyatom,therelativeyieldwilldiffer.Recommendedfissionyieldsfor140BaproductionaregiveninTable1.Thedirect(independent)fissionyieldofthedaughterproduct140La,whichiscounted,isgiveninTable2.Theseindependentfissionyieldsarerelativelylowcomparedtothe140Bacumulativefissionyieldandwillnotsignificantlyaffecttheaccuracyofthenondestructiveprocedureandneednotbeconsidered.Thehalf-lifeof140Bais12.752days.Itsdaughter140Lahasahalf-lifeof1.6781days.Thecomparativelylonghalf-lifeof140Baallowsthecountingtobedelayedseveralweeksafterirradiationinahigh-neutronfield.However,toachievemaximumsensitivitythedaughterproduct140Lashouldbecountedfivetosixdaysaftertheirradiationduringnondestructiveanalysisorfivetosixdaysafterchemicalseparationifthelattertechniqueisused.Analternativemethodafterchemicalseparationistocountthe140Badirectly.Becauseofits12.752dayhalf-lifeandsubstantialfissionyield,140Baisusefulforirradiationtimesuptoaboutsixweeksinmoderateintensityfields.Thenumberoffissionsproducedshouldbeapproximately109orgreaterforgoodcountingstatistics.Also,iftheirradiationtimeissubstantiallylongerthansixweeks,theneutronfluenceratedeterminedwillapplymainlytotheneutronfieldexistingduringthelatterpartoftheirradiation.The140Badecayconstantandyieldareknownmoreaccuratelythanthoseofmanyfissionproducts,soitissometimesusedasastandardorbasereactionwithwhichothermeasurementscanbenormalized.1.1Thistestmethoddescribestwoproceduresforthemeasurementofreactionratesbydeterminingtheamountofthefissionproduct140Baproducedbythenon-thresholdreactions235U(n,f),241Am(n,f),and239Pu(n,f),andbythethresholdreactions238U(n,f),237Np(n,f),and232Th(n,f).1.2Thesereactionsproducemanyfissionproducts,amongwhichis140Ba,havingahalf-lifeof12.752days.140Baemitsgammaraysofseveralenergies;however,thesearenoteasilydetectedinthepresenceofotherfissionproducts.Competingactivityfromotherfissionproductsrequiresthatachemicalseparationbeemployedorthatthe140Baactivitybedeterminedindirectlybycountingitsdaughterproduct140La.Thistestmethoddescribesbothprocedure(a),thenondestructivedeterminationof140Babythedirectcountingof140Laseveraldaysafterirradiation,andpro......
【中国标准分类号】:F46
【国际标准分类号】:17_240
【页数】:5P.;A4
【正文语种】:英语
【英文标准名称】:DigitalEnhancedCordlessTelecommunications(DECT)-GlobalSystemforMobilecommunications(GSM);DECT/GSMInterworkingProfile(IWP)-Implementationoffacsimilegroup3;EnglishversionETS300792:1997
【原文标准名称】:数字增强无线远程通信(DECT).移动通信全球系统(GSM).DECT/GSM互连的协议子集(IWP).传真执行3组;英文版本ETS300792:1997
【标准号】:DINETS300792-1998
【标准状态】:现行
【国别】:德国
【发布日期】:1998-07
【实施或试行日期】:
【发布单位】:德国标准化学会(DE-DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:无线通信服务;传真;综合服务数字网络;实行;数字的;定义;传真传输;移动无线电系统;公共的;传真设备;无线电设备;电信;无绳的;试验;无线电工程;服务定义
【英文主题词】:Access;Cordless;DECT;Definition;Definitions;Digital;Digitalenhancedcordlesstelecommunications;Facsimile;Facsimileequipment;Facsimiletransmission;Implementation;ISDN;Mobileradiosystems;Planning;Public;Radioengineering;Radioequipment;Radiosystems;Servicedefinition;Telecommunication;Telecommunications;Testing;Wirelesscommunicationservices
【摘要】:ThedocumentspecifiesthePortablePart(PP)interworkingandFixedPart(FP)interworkingrequirementsnecessarytoensurethattheGSMfacsimilegroup3servicecanbeprovidedoverDECT.
【中国标准分类号】:M11
【国际标准分类号】:33_070_30
【页数】:31P.;A4
【正文语种】:德语
