基于液体闪烁能谱分析方法的环境水中228Ra检测研究
TL99; 为了解决环境水中低活度228Ra分析难题,采用Ba(Ra)SO4共沉淀法载带水中228Ra的浓缩方法,利用原子吸收光谱法(Atomic Absorption Spectroscopy,AAS)测量稳定Ba元素来确定载带下228Ra的回收率;使用超低本底液体闪烁谱仪(Liquid Scintillation Spectrometer,LSC)测量Ra浓缩后的样品,从而获得低活度水平下比较精确的分析结果. Ba(Ra)SO4共沉淀法载带得到的228Ra的回收率在59%~90%范围内,228Ra的探测限为7.9 mBq·L?(1 1 L水样,测量时间t=20 h).利用原子吸收光谱法与1...
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| Published in | 核技术 Vol. 42; no. 3; pp. 27 - 32 |
|---|---|
| Main Authors | , , , , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
中国科学技术大学 合肥 230027%安徽省辐射环境监督站 合肥 230071%清华大学 北京 100084
2019
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| Subjects | |
| Online Access | Get full text |
| ISSN | 0253-3219 |
| DOI | 10.11889/j.0253-3219.2019.hjs.42.030301 |
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| Abstract | TL99; 为了解决环境水中低活度228Ra分析难题,采用Ba(Ra)SO4共沉淀法载带水中228Ra的浓缩方法,利用原子吸收光谱法(Atomic Absorption Spectroscopy,AAS)测量稳定Ba元素来确定载带下228Ra的回收率;使用超低本底液体闪烁谱仪(Liquid Scintillation Spectrometer,LSC)测量Ra浓缩后的样品,从而获得低活度水平下比较精确的分析结果. Ba(Ra)SO4共沉淀法载带得到的228Ra的回收率在59%~90%范围内,228Ra的探测限为7.9 mBq·L?(1 1 L水样,测量时间t=20 h).利用原子吸收光谱法与133Ba示踪测量的回收率,两者相对偏差在7%以内.LSC对228Ra/228Ac的探测效率为72.9%,加标水样测量结果的相对偏差为1.0%~10%.此方法可实现水中低活度228Ra的较精确测量. |
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| AbstractList | TL99; 为了解决环境水中低活度228Ra分析难题,采用Ba(Ra)SO4共沉淀法载带水中228Ra的浓缩方法,利用原子吸收光谱法(Atomic Absorption Spectroscopy,AAS)测量稳定Ba元素来确定载带下228Ra的回收率;使用超低本底液体闪烁谱仪(Liquid Scintillation Spectrometer,LSC)测量Ra浓缩后的样品,从而获得低活度水平下比较精确的分析结果. Ba(Ra)SO4共沉淀法载带得到的228Ra的回收率在59%~90%范围内,228Ra的探测限为7.9 mBq·L?(1 1 L水样,测量时间t=20 h).利用原子吸收光谱法与133Ba示踪测量的回收率,两者相对偏差在7%以内.LSC对228Ra/228Ac的探测效率为72.9%,加标水样测量结果的相对偏差为1.0%~10%.此方法可实现水中低活度228Ra的较精确测量. |
| Abstract_FL | Background 228Ra is the first decay daughter of 232Th decay chain, it is a low energy β radio-nuclide. [Purpose] To analyse low activity 228Ra in environmental water. [Methods] The process of concentrating 228Ra in water is carried out using Ba(Ra)SO4 co-precipitation method. The stable Ba is measured by atomic absorption spectroscopy (AAS) to determine the yield of 228Ra under the carrier tape. The ultra-low background liquid scintillation spectrometer (LSC) is used to measure the Ra-concentrated samples, and more accurate and low activity analysis result were obtained. [Results] The yield of 228Ra obtained via the Ba(Ra)SO4 co-precipitation method was in the range of 59%~90%, and the detection limit of 228Ra was 7.9 mBq·L?1 (1 L sample, measurement time t=20 h). As for two types recoveries of 228Ra, the relative deviation between 133Ba tracer method and atomic absorption spectrometry method is within 7%. The counting efficiency of LSC on 228Ra/228Ac is 72.9%. The relative deviation of the spiked water sample measurement is 1.0%~10%. [Conclusions] This method can achieve more accurate measurement of low activity 228Ra in water. |
| Author | 夏明明 顾先宝 王元 闻德运 於国兵 梁永广 吴其反 陈志 |
| AuthorAffiliation | 中国科学技术大学 合肥 230027%安徽省辐射环境监督站 合肥 230071%清华大学 北京 100084 |
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| Author_FL | WEN Deyun WU Qifan CHEN Zhi GU Xianbao LIANG Yongguang XIA Mingming YU Guobing WANG Yuan |
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| DocumentTitle_FL | Determination of 228Ra in environmental water by liquid scintillation spectrometry |
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| Keywords | 原子吸收光谱法 LSC,Ba(Ra)SO4 co-precipitation,Yield,Atomic absorption spectroscopy 液体闪烁谱仪 B(a Ra)SO4共沉淀法 回收率 228Ra |
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| Publisher | 中国科学技术大学 合肥 230027%安徽省辐射环境监督站 合肥 230071%清华大学 北京 100084 |
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| Snippet | TL99; 为了解决环境水中低活度228Ra分析难题,采用Ba(Ra)SO4共沉淀法载带水中228Ra的浓缩方法,利用原子吸收光谱法(Atomic Absorption Spectroscopy,AAS)测量稳定Ba元素来确定载带下228Ra的回收率;使用超低本底液体闪烁谱仪(Liquid Scintillation... |
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| Title | 基于液体闪烁能谱分析方法的环境水中228Ra检测研究 |
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