Simultaneous determination of 89Sr and 90Sr: comparison of methods and calculation techniques

Groska, Judit; Molnár, Zsuzsa; Bokori, Edit; Vajda, N.

doi:10.1007/s10967-011-1418-y

Cited by 14 publications

(5 citation statements)

References 4 publications

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“…4 Since 90 Sr is a purely β-radioactive nuclide, its quantitation based on β-ray measurement requires chemical isolation to eliminate interferences. However, the traditional technique of Sr isolation is time-consuming and produces large amounts of chemical waste, 6 whereas mass-spectrometric techniques 7,8 still have problems with detection limit, and they require pretreatment and specific instruments. Therefore, in contrast to the cases of 134 Cs and 137 Cs, which can be easily quantified by nondestructive analysis, much less information is available on the activity and distribution of 90 Sr after the FDNPP accident.…”

Section: ■ Introductionmentioning

confidence: 99%

Activity of ⁹⁰Sr in Fallout Particles Collected in the Difficult-to-Return Zone around the Fukushima Daiichi Nuclear Power Plant

Zhang

Igarashi

Satou

et al. 2019

Environ. Sci. Technol.

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The Fukushima Daiichi Nuclear Power Plant (FDNPP) accident released abundant radioactive particles into the surrounding environment. Herein, we analyzed the activity of 90Sr in these particles to estimate the contribution of this radionuclide to the overall radiation exposure and shed light on the processes that occurred during the accident. Seven radioactive particles were isolated from the dust and soil samples collected from areas surrounding the FDNPP, and the minimum/maximum 137Cs activities were determined as 224/4,100 Bq. Based on the size, specific activity, and 134Cs/137Cs activity ratios, we concluded that six of the seven radioactive particles were released from the Unit 1 reactor, while one particle was released from the Unit 3 reactor by a hydrogen explosion. Strontium-90 was detected in all radioactive particles, and the minimal/maximal 90Sr activities were determined as 0.046/1.4 Bq. 137Cs/90Sr activity ratios above 1000 were observed for all seven particles, that is, compared to 137Cs, 90Sr had negligible contribution to the overall radiation exposure. The 137Cs/90Sr activity ratios of the radioactive particles were similar to those of terrestrial environmental samples and were higher for particles released from the Unit 1 reactor than for samples collected from the Unit 1 reactor building, which indicates possibility of additional 90Sr-rich contamination after release of the particles.

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Section: ■ Introductionmentioning

confidence: 99%

Activity of ⁹⁰Sr in Fallout Particles Collected in the Difficult-to-Return Zone around the Fukushima Daiichi Nuclear Power Plant

Zhang

Igarashi

Satou

et al. 2019

Environ. Sci. Technol.

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“…The first step was separation on DGA Resin to remove 90 Y, yttrium interferences, and actinides, followed by a second step to purify Sr from ingrowing 90 Yand Ba interference on the Sr resin. Both resins have been extensively used in Sr radiochemistry (e.g., Groska et al 2012) and were obtained from Eichrom Technologies (Lisle, IL). The final elutions were converted to 2 mL of 0.5 M HCl acidity and mixed with 18 mL of the Instagel Plus scintillator (Perkin Elmer, Waltham, MA) in the LSC vials.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Any chemical purification of Sr must include removal of 140 Ba during the first several months after the accident. The radiochemistry for Sr and Y determination as well as measurement methods have been thoroughly reviewed in the literature (Wilken and Joshi 1991;Vajda and Kim 2010;Groska et al 2012;Rondahl and Ramebäck 2018). Among the most common radiometric measurement methods are liquid scintillation counting (LSC: both scintillation and Cherenkov counting) followed by gas proportional counting.…”

Section: Introductionmentioning

confidence: 99%

“…In this case, the analytes 89 Sr and 90 Sr, as well as participating 90 Y interfere with each other, thereby increasing the detection limits. The interference for this system was considered by Groska et al (2012), by means of estimating the counts of the interfering component from its activity. A more general numerical study was performed by Kanisch (2016b), who studied the detection limit of the analyte as the limit to zero activity, while keeping activities of other components non-zero.…”

Section: Introductionmentioning

confidence: 99%

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Detection Capability of 89Sr and 90Sr Using Liquid Scintillation Counting

et al. 2023

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We developed a new method for simultaneous determination of 89Sr and 90Sr with an emphasis on detectability. The samples were digested, and Sr was chemically purified followed by a single count on a liquid scintillation counter in three windows overlapping the 90Sr, 89Sr, and 90Y peaks. Gamma spectrometry was used to measure 85Sr, added for chemical recovery. The method was tested on 18 water samples spiked at levels from 9 to 242 Bq of 89Sr and 90Sr, with either single radionuclides or their mixtures. In addition, eight method blanks were measured. The data were analyzed numerically by solving a system of linear equations for 89Sr and 90Sr activities as analytes and 90Y activity as a participating component. The total uncertainties of the results were calculated numerically using variances and covariances. The average bias from the known activities was −0.3% (range from −3.6 to 3.1%) for 90Sr and − 1.5% (range from −10.1 to 5.1%) for 89Sr. The En -scores were within −1.0 and 1.0 at 95% confidence level. The detection capabilities of this method were determined by means of the decision threshold LC and the limit of detection referred to as the minimum detectable activity. All relevant uncertainties were propagated into the LC and minimum detectable activity. In addition, detection limits were calculated for the purpose of Safe Drinking Water Act monitoring. The detection capabilities were compared with the regulatory requirements in the US and EU for food and water. For samples spiked with either pure 89Sr or 90Sr, false positives were observed for the opposite radionuclide exceeding the above LC values. This was attributed to interference by the spiked activity. A new method was developed to calculate decision and detectability curves in the presence of interference.

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“…A large part of the methods described in the literature consist of isolating strontium by chemical separation, in order to get samples free from interfering radionuclides, followed by spectrometric measurement of the emitted beta radiation [12–16]. Another approach is to make use of the fact that the daughter nuclide of 90 Sr, 90 Y, is a high energy beta emitter.…”

Section: Introductionmentioning

confidence: 99%

Time optimization of 90Sr determinations: sequential measurement of multiple samples during decay of 90Y

Rondahl

Tovedal

Björnham

et al. 2016

J Radioanal Nucl Chem

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This work presents an optimized method for the determination of multiple samples containing 90Sr when its daughter 90Y is measured after chemical separation and in sequence, i.e. during its decay. Consequently the measurement times will increase for each subsequent sample, since there has been a longer time for decay before measurement. Compared to a previously published approach, when 90Y is measured during its ingrowth, the gain in total analysis time (time for ingrowth+ summation of measurement times) is not that large, particularly not for low background instruments. However, results for a large part of the samples can be delivered earlier.

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Simultaneous determination of 89Sr and 90Sr: comparison of methods and calculation techniques

Cited by 14 publications

References 4 publications

Activity of ⁹⁰Sr in Fallout Particles Collected in the Difficult-to-Return Zone around the Fukushima Daiichi Nuclear Power Plant

Activity of ⁹⁰Sr in Fallout Particles Collected in the Difficult-to-Return Zone around the Fukushima Daiichi Nuclear Power Plant

Detection Capability of 89Sr and 90Sr Using Liquid Scintillation Counting

Time optimization of 90Sr determinations: sequential measurement of multiple samples during decay of 90Y

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Simultaneous determination of 89Sr and 90Sr: comparison of methods and calculation techniques

Cited by 14 publications

References 4 publications

Activity of 90Sr in Fallout Particles Collected in the Difficult-to-Return Zone around the Fukushima Daiichi Nuclear Power Plant

Activity of 90Sr in Fallout Particles Collected in the Difficult-to-Return Zone around the Fukushima Daiichi Nuclear Power Plant

Detection Capability of 89Sr and 90Sr Using Liquid Scintillation Counting

Time optimization of 90Sr determinations: sequential measurement of multiple samples during decay of 90Y

Contact Info

Product

Resources

About

Activity of ⁹⁰Sr in Fallout Particles Collected in the Difficult-to-Return Zone around the Fukushima Daiichi Nuclear Power Plant

Activity of ⁹⁰Sr in Fallout Particles Collected in the Difficult-to-Return Zone around the Fukushima Daiichi Nuclear Power Plant