简介:ThedosimetricphosphorsLi_3PO_4:M(M=Tb,Cu)wereproducedbymodifiedsolid-statemethod.ThestructuralandmorphologicalcharacterizationwascarriedoutthroughX-raydiffraction(XRD)andscanningelectronmicroscope(SEM).Additionally,thephotoluminescence(PL),thermoluminescence(TL)andopticallystimulatedluminescence(OSL)propertiesofpowderLi_3PO_4dopedwithTbandCuwerestudied.ItisadvocatedthatLi_3PO_4:CuphosphornotonlyshowshigherOSLsensitivity(25timesormore)butalsogivesfasterdecayinOSLsignalsthanthatofLi_3PO_4:Tb~(3+)phosphor.Theminimumdetectabledose(MDD)ofLi_3PO_4:M(M=Tb,Cu)phosphorsisfoundtobe21.69×10~(-3)and3.33×10~(-6)J·kg~(-1),respectively.InOSLmode,phosphorshowslineardoseresponseintherangeof0.02-20.00J·kg~(-1).InTLmode,sensitivityofLi_3PO_4:CuphosphorismorethanthatofLi_3PO_4:Tbphosphor.Thekineticsparameterssuchasactivationenergyandfrequencyfactorsweredeterminedbypeakshapemethod,andphotoionizationcrosssectionsofpreparedphosphorwerecalculated.
简介:摘要目的探讨尿道损伤早期最佳处理方法。方法回顾性分析86例早期处理的尿道损伤患者的病例资料。结果前尿道损伤40例,其中球部尿道断裂24例,尿道破裂及挫伤16例,行尿道修补、对端吻合术20例,尿道镜下成功置尿管入膀胱11例,初次插尿管成功6例,3例单纯膀胱造瘘术行二次尿道修补术,共5例行尿道内切开术。后尿道损伤46例中单纯膀胱造瘘术4例,尿道会师术6例,尿道会师牵引术29例,改良尿道会师牵引术7例,共13例后尿道损伤后期再次行尿道内切开术。结论前尿道损伤经尿道镜置管可使病人免除手术,给合尿道内切开术可提高治愈率,尿道对端吻合手术疗效可靠。后尿道损伤改良会师牵引术可作为首选,应尽量避免单纯膀胱造瘘。