Method For Determination Of 226Ra Research Articles

Validation of a newly adopted chemical method for determination of 226Ra and 228Ra activities in water and shrimp samples

Validation of a newly adopted chemical method for determination of 226Ra and 228Ra activities in water and shrimp samples

Determination of 226Ra using molecular recognition technology product AnaLig® Sr-01

A new method for determination of 226Ra using molecular recognition technology product AnaLig® Sr-01 was developed. For radium recovery, 133Ba tracer was used. The method’s performance was investigated by analysis of model gravel samples spiked with international intercomparison sample with known activity of 226Ra. The proposed method for the determination of 226Ra was applied for analysis of various admixtures of building materials from Slovakia and activity concentrations of 226Ra in the samples were in the range (5.2–165.0) Bq kg−1.

Application of in-house method for determinationof radium isotopes in environmental samples usingthe Liquid Scintillation counting technique

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.

Development of a method for the determination of 226Ra by liquid scintillation counting

Liquid scintillation counting has not been widely applied to a-particle detection because of its poor energy resolution and variable background. In the present work, a time saving and reasonably accurate method for determination of 226Ra in water has been developed, using liquid scintillation spectrometry and pulse-shape analysis. The effect of three levels of chemical quench on the spillover of alpha interactions into the beta window and vice versa was assessed. The advantages of liquid scintillation in comparison with other methods (radon emanation) for determination of 226Ra are the high counting efficiency (~100%) and the easier sample preparation, with no need for sample preconcentration.

Determination of radium-226 in aqueous samples using liquid scintillation counting

A direct method for determination of 226Ra in aqueous samples using a heterogeneous liquid scintillation counting system has been developed. In this method, radium is separated and purified from the sample as the chloride using barium as a carrier. The chloride salt is soluble in less than 1 ml of water, which is then emulsified into scintillator using Triton X-100. A lower limit of detection of 1.2 mBq l–1(0.033 pCi l–1) was achieved. Any scintillation cocktail for β-counting can be used.