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首页> 外文期刊>Journal of Analytical Sciences, Methods and Instrumentation >Application of in-house method for determinationof radium isotopes in environmental samples usingthe Liquid Scintillation counting technique
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Application of in-house method for determinationof radium isotopes in environmental samples usingthe Liquid Scintillation counting technique

机译：液体闪烁计数技术在室内方法测定环境样品中镭同位素中的应用

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A method for determination of 226Ra and 228Ra in environmental samples using the α-β coincidence liquid scintillation counting (LSC) has been developed. Radium were preconcentrated from environmental samples by coprecipitation with BaSO4, then purified from others radionuclide interferences using the cation column exchange (Bio-Rad AG 50 W-X4 resin with 200-400 mesh size and H+ form) and operating in warm temperature which is between 70-80oC. Then, the Ba(Ra)SO4 precipitate was filtered through the Millipore filter paper, dried and weighed to calculate chemical yield. The activity concentration of radium isotopes in mixture of liquid scintillation cocktails were measured using LSC after being stored for over 21 days to allow the growth of the progeny nuclides. The method has been validated with a certi-fied reference material supplied by the International Atomic Energy Agency and reliable results were obtained. The radiochemical yields for radium were 59% - 90% and recovery was 97% and 80% for 226Ra and 228Ra, respectively. Sixteen seawater and fish flesh samples collected in Kapar coastal water have been analyzed with the developed method. The obtained radium activity concentrations in seawater were in the range of 02.08 ± 0.82 mBq/L to 3.69 ± 1.29 mBq/L for 226Ra and 6.01 ± 3.05 mBq/L to 17.07 ± 6.62 mBq/L for 228Ra. Meanwhile, the activity concentrations of 226Ra and 228Ra in fish flesh were in the range of 11.82 ± 5.23 – 16.53 ± 6.53 Bq/kg dry wt. and 43.52 ± 16.34 – 53.57 ± 19.86 Bq/kg dry wt., respectively.
机译：开发了一种使用α-β符合液体闪烁计数（LSC）测定环境样品中226Ra和228Ra的方法。通过与BaSO4共沉淀从环境样品中对镭进行预浓缩，然后使用阳离子柱交换器（Bio-Rad AG 50 W-X4树脂，尺寸为200-400目，H +形式）从其他放射性核素干扰物中纯化，并在介于70-80oC。然后，Ba（Ra）SO4沉淀物通过Millipore滤纸过滤，干燥并称重，以计算化学产率。液态闪烁混合物混合物中镭同位素的活性浓度在储存超过21天后使用LSC进行测量，以使子代核素生长。该方法已使用国际原子能机构（International Atomic Energy Agency）提供的认证参考材料进行了验证，并获得了可靠的结果。镭的放射化学产率为59％-90％，226Ra和228Ra的回收率分别为97％和80％。用开发的方法分析了在Kapar沿海水中收集的16个海水和鱼肉样本。所获得的海水中镭活度浓度对于226Ra为02.08±0.82 mBq / L至3.69±1.29 mBq / L，对于228Ra为6.01±3.05 mBq / L至17.07±6.62 mBq / L。同时，鱼肉中226Ra和228Ra的活性浓度在11.82±5.23 – 16.53±6.53 Bq / kg干重范围内。和43.52±16.34 – 53.57±19.86 Bq / kg干重。

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