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1.
Veronika Drábová Jana Strišovská Lívia Dvorská Jozef Kuruc 《Journal of Radioanalytical and Nuclear Chemistry》2012,292(3):1141-1145
Two separation techniques for strontium determination using AnaLig® Sr01 molecular recognition technology and extraction chromatography Sr® resin were tested. The methods performance was investigated by analysis of NPL (High Alpha–Beta 2003) intercomparison sample. The results obtained for both procedures were compared in terms of activities and recoveries. Data analysis proved a good agreement with the reference values. The AnaLig® Sr01 separation method for 90Sr determination was successfully validated with the same performance as the Sr® resin method. 相似文献
2.
Željko Grahek Astrid Gojmerac Ivšić Nikolina Krljan Marijana Nodilo 《Journal of Radioanalytical and Nuclear Chemistry》2011,289(2):437-449
This paper describes the procedures of isolating strontium from wine and soil samples which enable creating of procedure for
rapid determination of 90Sr. The method of determination of 90Sr includes binding of Sr on the cationic exchanger IR-120 from the sample and simultaneous elution from the cation column
and binding on the Sr column, separation of Sr on Sr resin with HNO3 even in presence of alcohols and subsequent Cherenkov counting. Sr can be efficiently bind on Sr resin and separated from
the other elements with lower acid concentrations in the presence of a low portion of alcohol, or even from a wine sample
without the loss of Sr resin capacity. The binding strength of Sr on Sr resin decreases with the rising of HNO3 concentration (1–5 M) in the presence of 13% of ethanol or methanol, and with the rising of the alcohol portion in constant
concentration of HNO3. Application of cation exchanger for Sr binding in phase of sample preparation decreases Sr column loading and improve Sr
recovery. The method allows the determination of 90Sr activities in wine and soil sample lower than 10 mBq in reasonable time. 相似文献
3.
Yonnhee Jung Hyuncheol Kim Jong-Myoung Lim Kun Ho Chung 《Journal of Radioanalytical and Nuclear Chemistry》2017,313(2):401-408
This study investigated an analytical method for detecting 90Sr in soil samples for the routine monitoring of environmental radioactivity. Mineral acid leaching and fusion methods were first used to digest the soil sample, and the analytical results were compared. DGA resin was employed to separate 90Y, being a daughter of 90Sr. Then, 90Y was analyzed by liquid scintillation counter (LSC). These analytical results were compared with those obtained using Sr resin, which is a well-known, simple and reliable separation method. With the DGA resin approach a minimum detectable activity of ~0.28 Bq kg?1 was detected in a 50 g sample, with 180 min of counting time, 70% recovery and ~97% counting efficiency using a LSC. 相似文献
4.
Judit Groska Zsuzsa Molnár Edit Bokori Nóra Vajda 《Journal of Radioanalytical and Nuclear Chemistry》2012,291(3):707-715
The presence of 89Sr and 90Sr in the biosphere constitutes a biological hazard. There are several analytical methods for the determination of 89Sr and 90Sr. Three analytical methods of various application fields using selective Sr resin for Sr separation and DGA resin for Y
separation and measuring techniques, i.e. liquid scintillation spectrometry and Cerenkov counting are discussed in the paper.
The calculation techniques are compared in the aspects such as trueness and accuracy of the results and the limit of detection.
Uncertainties and detection limits are calculated using the spreadsheet method. 相似文献
5.
Eliane S. C. Temba Aluísio S. Reis Júnior Ângela Maria Amaral Roberto P. G. Monteiro 《Journal of Radioanalytical and Nuclear Chemistry》2011,290(3):631-635
A methodology for the determination of 90Sr in low- and intermediate-level radioactive wastes from nuclear power plants is presented in this work. It is a part of
a methodology developed for the sequential radiochemical separation of radionuclides difficult-to-measure directly by gamma
spectrometry in these radioactive wastes. The separation procedure was carried out using precipitation and extraction chromatography
with Sr Resin, from Eichrom and the 90Sr was measured by liquid scintillation counting (LSC). Optimum conditions for the pretreatment, separation and LSC measurements
were determined using simulated samples, which were prepared using standard solutions and carriers. The procedure showed to
be rapid and achieved a good chemical yield, in the range 60–90%, and a detection limit of 6.0 × 10−4 Bq g−1. The method was also tested by participation in a national intercomparison program, with aqueous samples, with good agreement
of results. 相似文献
6.
Chang Heon Lee Myung Ho Lee Sun Ho Han Yeoung-Keong Ha Kyuseok-Song 《Journal of Radioanalytical and Nuclear Chemistry》2011,288(2):319-325
A simple and rapid separation procedure was systemized for the determination of 99Tc, 90Sr, 94Nb, 55Fe and 59,63Ni in low and intermediate level radioactive wastes. The integrated procedure involves precipitation, anion exchange and extraction
chromatography for the separation and purification of individual radionuclide from sample matrix elements and from other radionuclides.
After separating Re (as a surrogate of 99Tc) on an anion change resin column, Sr, Nb, Fe and Ni were sequentially separated as follows; Sr was separated as Sr (Ca-oxalate)
co-precipitates from Nb, Fe and Ni followed by purification using Sr-Spec extraction chromatographic resin. Nb was separated
from Fe and Ni by anion exchange chromatography. Fe was separated from Ni by anion exchange chromatography. Ni was separated
as Ni-dimethylglyoxime precipitates after the removal of 134,137Cs and 110mAg by Cs-phosphotungstate and AgCl precipitation, respectively. Finally, the radionuclide sources were prepared by precipitation
for their radioactivity measurements. The reliability of the procedure was evaluated by measuring the recovery of chemical
carriers added to a synthetic radioactive waste solution. 相似文献
7.
Annika Tovedal Ulrika Nygren Petra Lagerkvist Anna Vesterlund Henrik Ramebäck 《Journal of Radioanalytical and Nuclear Chemistry》2009,282(2):461-466
In this work a method for the determination of both 89Sr and 90Sr is presented. The method can potentially be used in radiological emergency and deliver results shortly after an incident.
The method development was based on theoretical calculations of potential interferences from other fission products and how
these could be discriminated when applying different chemical separation schemes. Validation was done on reactor coolant water
containing short-lived fission products, and on a reference material. The results indicate that correct results of 89Sr and 90Sr can be obtained 4 and 9 days, respectively, after an incident. 相似文献
8.
Filip Kužel Petra Staffová Irena Špendlíková Jan John Ferdinand Šebesta 《Journal of Radioanalytical and Nuclear Chemistry》2010,286(3):729-734
Solid extractants containing di-(2-ethylhexyl)phosphoric acid (HDEHP) in the support based on modified polyacrylonitrile (PAN)
were studied for the determination of 90Sr by means of measuring the activity of its separated 90Y daughter. In this paper, 152Eu and 133Ba were used as chemical homologues of 90Y and 90Sr. For these radionuclides, dependences of mass distribution coefficients (D
g) on the nitric acid concentration were measured for several types of HDEHP-PAN solid extractants. The mechanism of the Eu3+ and Ba2+ ions extraction was confirmed to follow the theoretical two-phase equation for the chelating extractants. Further, the influences
of the presence of nitrates, calcium and iron ions on the values of D
g(Ba, Eu) were determined concentrating on the possibility of masking the iron ions by the addition of the ascorbic acid. This method
was tested on the solution simulating the leachate of ashed green plant sample. The results obtained make the application
of solid extractants containing HDEHP in PAN support prospective for 90Sr determination. 相似文献
9.
A. Tovedal U. Nygren H. Ramebäck 《Journal of Radioanalytical and Nuclear Chemistry》2008,276(2):357-362
In radiological emergency, rapid determination of radiostrontium will be necessary. The required quantification levels will
be relatively high which offers smaller sample sizes and shorter ingrowth and counting times. In this paper a rapid method
for the determination of 90Sr in fresh milk in emergency preparedness is presented. The method is based on microwave digestion, chemical separation of
Sr, ingrowth of 90Y and Cherenkov measurements. In order to minimize the total analysis time, a mathematical model was developed. For a given
number of samples the model minimizes the analysis time by optimizing the ingrowth and counting time in order to reach a detection
limit fit-for-purpose. 相似文献
10.
Estimation of <Superscript>90</Superscript>Sr activity in reprocessed uranium from the PUREX process
S. Ravi A. K. Deepa B. Surekha S. Susheela P. V. Achuthan S. Anil Kumar K. Vijayan U. Jambunathan S. K. Munshi P. K. Dey 《Journal of Radioanalytical and Nuclear Chemistry》2007,272(1):123-126
90Sr estimation in reprocessed uranium was carried out by a series of solvent extraction and carrier precipitation techniques
using strontium and lanthanum carriers. Fuming with HClO4 was used to remove 106Ru as RuO4. Three step solvent extraction with 50% tri-n-butyl phosphate in xylene in presence of small amounts of dibutyl phosphate
and thenoyl trifluoro acetone was carried out to eliminate uranium, plutonium, thorium and protactinium impurities. Lanthanum
oxalate precipitation in acid medium was employed to scavenge the remaining multivalent ions. Strontium was precipitated as
strontium oxalate in alkaline pH and 137 Cs was removed by washing the precipitate with water. A strontium recovery well above 70% was obtained. Final estimation
was carried out by radiometry using end window GM counter after drying the precipitate under an infra red lamp. The same procedure
was extended to the estimation of 90Sr in a diluted sample of the actual spent fuel solution. An additional lanthanum oxalate precipitation step was required
to remove the entire 144Ce impurity from this sample. This modified procedure was employed in the determination of 90Sr in a number of reprocessed uranium samples and the over all precision of the method was found to be well within ±10%. An
additional barium chromate precipitation step was necessary for the analysis of reprocessed uranium samples from high bumup
fuels to eliminate trace amounts of short lived 224Ra produced during the decay of 232U and its daughters as they interfere in the estimation of 90Sr. 相似文献
11.
Zack Varve Edward P. C. Lai Chunsheng Li Baki B. Sadi Gary H. Kramer 《Journal of Radioanalytical and Nuclear Chemistry》2012,292(3):1411-1415
A rapid bioassay for 90Sr was developed involving preconcentration of 90Sr/90Y from human urine samples with a cation exchange polymer (poly–acrylamido–methyl–propanesulfonic acid) coated onto magnetic
nanoparticles, followed by selective elution of 90Sr (over 90Y) with phosphate for determination by liquid scintillation analysis. The minimum detectable activity for this method (4.9 ± 0.5 Bq/L)
is lower than the required sensitivity of 19 Bq/L for 90Sr in human urine samples, as defined in the requirements for radiation emergency bioassay techniques for the public and first
responders based on the dose threshold for possible medical attention recommended by the International Commission on Radiological
Protection. The relative bias was 9.2%, the relative precision was 3.2%, and the linear dynamic range covered 12–600 Bq/L.
This simple and rapid bioassay method is found to be in compliance with the HPS ANSI N13.30 performance criteria for radiobioassay. 相似文献
12.
Strontium
isolation from natural samples with Sr resin and subsequent determination of 90Sr</p>
</p>
Ž. Grahek K. Košutić M. Rožmarić-Mačefat 《Journal of Radioanalytical and Nuclear Chemistry》2006,268(2):179-190
The
reliability of an 90Sr determination method was tested using an Sr
extraction chromatographic resin for strontium isolation. The 90Sr-content
in samples of vegetables, soil and water (obtained from Environmental
Measurement Laboratory, USA) were determined and the results were controlled by
classical methods and by using an anion-exchanger and an alcohol solution of
nitric acid for the strontium isolation. These methods were previously tested
by determining 90Sr in IAEA 326 and 327 samples of soil. It is shown
that the isolation process with Sr resin is simpler and faster than the
classical and mixed solvent anion-exchange methods. The efficiency of isolation
on a Sr column depends on the resin quantity and separation conditions; and is
the highest with a Sr column, compared to the classical and anion-exchange
methods. Experimental data and theoretical models were used to calculate the
parameters that enable the estimation of optimum dimensions of the column for
isolation. A simple relation is proposed for the calculation of breakthrough
volume, which defines the sample and eluent volumes for an optimal strontium
isolation.</p>
</p> 相似文献
13.
Hans Sahli Stefan Röllin José A. Corcho Alvarado 《Journal of Radioanalytical and Nuclear Chemistry》2017,311(3):1633-1642
A new method was developed for the determination of 99technetium (Tc) by ICP-MS. We report, for the first time, an activity of 99Tc for the reference material IAEA-315. For the IAEA-375, IAEA-373 and IAEA-381, our results confirmed the values already reported in the literature. The developed method was used for analysing sediments from the Yenisei river (collected downstream of a nuclear fuel reprocessing plant) and for characterizing corrosion products of depleted uranium penetrators that were fired during the Balkan conflict. 相似文献
14.
Chang Heon Lee Moo Yul Suh Kwang Yong Jee Won Ho Kim 《Journal of Radioanalytical and Nuclear Chemistry》2007,272(1):187-194
A sequential separation procedure has been developed for the determination of 99Tc, 94Nb, 55Fe, 90Sr and 59/63Ni in various radioactive wastes generated from nuclear power plants. Ion exchange and extraction chromatography were adopted
for individual separation of the radionuclides. Precipitation was supplementarily utilized for both purification of the individual
radionuclides and preparation of the radionuclide sources for use in a radioactivity measurement. The chromatographic separation
behavior of the radionuclides both from the sample matrix metals and from one another was investigated using stable metals,
Re (as a surrogate of 99Tc), Nb, Fe, Sr and Ni. The validity of the procedure for reliability and applicability was evaluated by measuring the recovery
of the metal carriers added to synthetic radioactive waste solutions. The recoveries by the chromatographic separation were
in the range of 84.8 to 102.2% with 2s of less than 8.6%, the recoveries by the precipitation being in the range of 84.3 to 97.3% with 2s of less than 10.9%. 相似文献
15.
Baki B. Sadi Christopher Rinaldo Norman Spencer Chunsheng Li 《Journal of Radioanalytical and Nuclear Chemistry》2018,316(1):179-189
A radiobioassay method has been developed for the sequential determination of 90Sr, 241Am and Pu isotopes in a urine sample. Unlike the existing methods using multiple extraction chromatographic cartridges, this work demonstrates an application of an automated ion chromatographic (IC) system for the separation of these radionuclides on a single IC column. The method meets the bioassay performance criteria for relative bias and relative precision as recommended by ANSI/HPS N13.30-2011. The detection limits for the radionuclides are found to be satisfactory for medical intervention in case of an accidental exposure scenario. Sample preparation time is less than 11 h. 相似文献
16.
Summary The dispersion of radioactive substances in the environment following nuclear weapon tests in atmosphere since 1954 and accidents to nuclear plants, like that in Chernobyl in 1986, have allowed us to study the migration processes of some radionuclides in complex ecosystems such as lakes are. In the present paper the behavior of 137Cs and 90Sr in different compartments of the Monterosi Lake (central Italy) was assessed. The 137Cs concentration was measured in lake water as well as sediment, stream water, aquatic plant and fish samples. 90Sr concentration in water and sediments was also determined. A total inventory of 4206±76 Bq . m-2 and 958±79 Bq . m-2 (on 27/6/01) has been found for 137Cs and 90Sr, respectively. The experimental data presented here allow to calibrate theoretical models predicting the temporal trend of radionuclide concentration in similar ecosystems. Moreover, information on cesium and strontium migration processes can be extended to other pollutants having similar environmental behavior. 相似文献
17.
I. I. Dovhyi D. A. Kremenchutskii V. Yu. Proskurnin O. N. Kozlovskaya 《Journal of Radioanalytical and Nuclear Chemistry》2017,311(3):1643-1648
90Y was separated from 90Sr using an extraction chromatographic resin consisting of 4, 4′(5′)-bis-t-butylcyclohexano-18-crown-6 (DtBuCH18C6), 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl) amide (C2mimNTf2), and a polymer (Amberlite XAD-7). Ionic liquid was introduced into the column to improve the separation efficiency. The column showed an excellent performance for the separation of Y from Sr. After the separation, the ratio of 90Sr/90Y was <2.0 × 10?5; the column was recycled for >18 times. This study provides preliminary results on columns to produce 90Y with a high purity in radiopharmaceuticals. 相似文献
18.
I. Lopes M. J. Madruga A. Mourato J. Abrantes M. Reis 《Journal of Radioanalytical and Nuclear Chemistry》2010,286(2):335-340
The Nuclear and Technological Institute (ITN) has the legal responsibility to carry out the environmental radiological monitoring at a national level. This survey was planned to provide relevant information on radioactivity levels in different components of the ecosystem. In what concerns the terrestrial environment the evaluation of the 90Sr activity concentrations in foodstuffs has been performed using a method based on the separation of 90Sr by extraction chromatography and beta determination by liquid scintillation counting (LSC) technique. The trials were carried out using 7 g of ash samples and 3 g of commercial Sr-resin (Eichrom). Validation trials were also performed using 90Sr spiked samples. The chemical yields were determined by gravimetric method, after the addition of stable strontium to the foodstuffs. The 90Sr activity concentrations in complete meals, meat and vegetables were determined after 90Y ingrowths in the region 12–862 keV, using the Tri-Carb 3170 TR/SL scintillation counter in normal mode and a counting time of 120 min. The results obtained were low and of the same order of magnitude of those reported by other European countries. 相似文献
19.
Sultan Şahin Fatih Külahcı Mahmut Doğru 《Journal of Radioanalytical and Nuclear Chemistry》2011,290(2):313-318
In this study, 90Sr (540 keVβ −), 129I (150 keVβ −) and the gross beta radioactivity concentrations were determined for the samples of tea as the most leading consumed hot
drink in the markets (processed and packaged for sale) in our country. Furthermore, the obtained data were statistically analyzed.
For determination of 129I (150 keVβ−), 90Sr (540 keVβ−) and gross radioactivity concentrations in tea samples, a sensor system consisting of scintillation detector with BP4 probe
sensitive to beta radiation and a radiation meter (ST7) configurable for windows at desired power was used. 相似文献
20.
The determination is based on the evaluation of experimentally obtained breakthrough curves using the erfc-function. The first
method is founded on the assumption of a reversible linear sorption/desorption isotherm of radionuclides on solid phase with
constant distribution and retardation coefficients, whereas the second one is based on the assumption of a reversible non-linear
sorption/desorption isotherm described with the Freundlich equation, i.e., with non-constant distribution and retardation coefficients. Undisturbed cores of 5 cm in diameter and 10 cm long were embedded
in the Eprosin-type cured epoxide resin column. In this study the so-called Cenomanian background groundwater was used as
transport medium. The groundwater containing radionuclides was introduced at the bottom of the columns at about 4 mL h−1 constant flow-rate. The results have shown that in the investigated fucoidic sands: (i) the sorption was in principle characterized
by linear isotherms and the corresponding retardation coefficients of 137Cs and 85Sr, depending on the type of sample, were approximately 13 or 44 and 5 or 15, respectively; (ii) the desorption was characterized
by non-linear isotherms, and the retardation coefficients of the same radionuclides ranged between 23–50 and 5–25, respectively.
The values of the hydrodynamic dispersion coefficients of these radionuclides varied between 0.43–1.2 cm2 h−1.
相似文献