CAJ | 학술논문

目的建立应用屏栅电离室谱仪同时分析样品中多种α核素的方法.方法超声分散和真空干燥系统制备大面积样品源,应用大面积标准薄源和钚标准面源对屏栅谱仪测量条件进行优化,建立能量和效率刻度曲线,采用铀钍天然系矿石标准物质(GBW04127)对方法的准确性进行验证.结果 Np、Pu和Am大面积标准薄源的能量曲线非线性＜0.2％,线性良好.237Np、239Pu、241 Am的半峰宽分别为112、84和106 keV.大面积标准薄源的探测效率均值为31.2％.分析铀钍天然系矿石标准物质比活度测量值与标准值相一致.用该方法测得某铀矿石中232Th、238U、230Th、234U/226Ra、210Po、222Rn和218Po,比活度分别为5.3、3.8、35.6、21.4、27.0、19.6和11.1 Bq/g.结论该方法能够快速分析环境样品中的多种α核素,适合低水平放射性环境样品的α谱分析.
목적 건립응용병책전리실보의동시분석양품중다충α핵소적방법.방법 초성분산화진공간조계통제비대면적양품원,응용대면적표준박원화비표준면원대병책보의측량조건진행우화,건립능량화효솔각도곡선,채용유토천연계광석표준물질(GBW04127)대방법적준학성진행험증.결과 Np、Pu화Am대면적표준박원적능량곡선비선성＜0.2％,선성량호.237Np、239Pu、241 Am적반봉관분별위112、84화106 keV.대면적표준박원적탐측효솔균치위31.2％.분석유토천연계광석표준물질비활도측량치여표준치상일치.용해방법측득모유광석중232Th、238U、230Th、234U/226Ra、210Po、222Rn화218Po,비활도분별위5.3、3.8、35.6、21.4、27.0、19.6화11.1 Bq/g.결론 해방법능구쾌속분석배경양품중적다충α핵소,괄합저수평방사성배경양품적α보분석.
Objective To develop the method of analyzing α-radionuclides using large area grid ionization chamber.Methods Ultrasonic dispersion and vacuum drying system was used to prepare sample source,large standard thin source and plutonium plane source were used to optimize the working condition of spectrometer,and calibrate the instrument for analyzing α emitters.The certified reference materials (GBW04127) were used to verify the accuracy of the method.Results The non-linearity of calibration curve for standard thin sources of neptunium,plutonium and americium was less than 0.2％,and the resolution were 112,84 and 106 keV,respectively.The counting efficiency was 31.2％ for the large standard thin source.The values of specific activity measured in this way were in good agreement with those of the certified reference materials.232Th,238U,230Th,234U/226Ra,210Po,222Rn and 218Po were analyzed in a uranium mineral sample,and their specific radioactivity values were 5.3,3.8,35.6,21.4,27.0,19.6 and 11.1 Bq/g,respectively.Conclusions The method can be used to analyze α spectrum quickly in low-level radioactive environmental samples.