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Chen L.-Y.,Northwest Institute of Nuclear Technology | Wu S.,Northwest Institute of Nuclear Technology | Zhang C.-Y.,Northwest Institute of Nuclear Technology | Chen Z.-Y.,Beijing National Data Center and Radionuclide Laboratory
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2014

The radioactive xenon is produced in nuclear facilities which requires special treatment before allowed to release into the atmosphere. In the cleaning process of gaseous waste from nuclear power plant, the adsorption of Xe is great important. Five porous materials were selected, including granular active carbons, molecular sieve and active carbon fiber, and the comparison of their performances was carried out in terms of specific surface area, pore volume, as well as static adsorption capacity in order to determine the most qualified material. The influences of the inlet gas pressure and the length-diameter ratio of the adsorption column on adsorption of Xe in active carbon were studied. The adsorptive capacity of the column is the best when the length-diameter ratio is 17∶1.


Liu S.-J.,Beijing National Data Center and Radionuclide Laboratory | Chen Z.-Y.,Beijing National Data Center and Radionuclide Laboratory | Wang S.-L.,Beijing National Data Center and Radionuclide Laboratory | Chang Y.-Z.,Beijing National Data Center and Radionuclide Laboratory | And 6 more authors.
Journal of Separation Science | Year: 2014

GC is usually used for xenon concentration and radon removal in the International Monitoring System of the Comprehensive Nuclear-Test-Ban Treaty. In a gas chromatograph, the injection volume is defined to calculate the column capacity. In this paper, the injection volume was investigated and a fitting formula for the injection volume was derived and discussed subsequently. As a consequence, the xenon injection volume exponentially decreased with the column temperature increased, but exponentially increased as the flow rate increased. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Liu S.-J.,Beijing National Data Center and Radionuclide Laboratory | Chen Z.-Y.,Beijing National Data Center and Radionuclide Laboratory | Chang Y.-Z.,Beijing National Data Center and Radionuclide Laboratory | Wang S.-L.,Beijing National Data Center and Radionuclide Laboratory | And 2 more authors.
Fenxi Huaxue/ Chinese Journal of Analytical Chemistry | Year: 2012

Xenon concentration is an essential parameter for monitoring radionuclide in the atmosphere in the international monitoring system of comprehensive- nuclear-test-ban-treaty (CTBT). A micro-thermal conductivity detector (μTCD) with single resistance heating element in gas chromatography, a concentration detector for any compound, was connected with capillary column and applied to the determination of xenon concentration. To improve the μTCD measuring ability, xenon responses were investigated under the conditions of swept time of sample in loop, column flow rate, reference flow rate, makeup flow rate, oven temperature and detector temperature. And the equivalent xenon response value (EXRV) was particularly discussed. The results showed that when the column flow rate was set at 1.5 mL min -1, the shortest swept time of 1.0 mL gas sample into column was 0.4 min. The EXRV increases with the increases of column flow rate, but independent of oven temperature. When the flow-rate ratio equaled to 2.3, the maximum of EXRV (0.98 (μVshPa -1) was achieved; when flow-rate ratio was in the range of 2-3, the average of EXRV was 0.97 (μ.V hPa, and relative standard deviation was 1.2%. Therefore, all the flow rates of column, reference and makeup would apparently influence the xenon signals and thus the detector performance would be improved by adjusting these parameters in practice. Copyright © 2012, Changchun Institute of Applied Chemistry.


Fan Y.-Q.,Beijing National Data Center and Radionuclide Laboratory | Wang S.-L.,Beijing National Data Center and Radionuclide Laboratory | Li Q.,Beijing National Data Center and Radionuclide Laboratory | Zhao Y.-G.,Beijing National Data Center and Radionuclide Laboratory | And 2 more authors.
Applied Radiation and Isotopes | Year: 2013

The performance of a new Compton-suppression spectrometer consisting of one HPGe detector and three NaI(Tl) detectors was studied. The peak-to-Compton ratio for a 137Cs source is 1150 and the integral background count rate is 0.3 5s-1 over the energy interval 20-3000keV. The spectrometer was used to acquire both Compton-suppressed and non-suppressed spectra of aerosol samples collected in Beijing following the Fukushima nuclear accident. © 2013 Elsevier Ltd.


Dong K.,China Institute of Atomic Energy | Jiang S.,China Institute of Atomic Energy | He M.,China Institute of Atomic Energy | Lin M.,China Institute of Atomic Energy | And 7 more authors.
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | Year: 2015

Abstract The determination of long-lived nuclide 129I in terrestrial formations has many important applications. The AMS measurement method of 129I has been set up for many years at China Institute of Atomic Energy (CIAE). For further exploring the potential applications of 129I, samples of Deep Sea Ferromanganese Crusts (DSFC) and aerosol were analyzed by Accelerator Mass Spectrometry (AMS). The results show that 129I is not only a good tool for dating, but also an ideal nuclide for nuclear safety monitoring. The newest experimental progress and the main results are detailed in this presentation. © 2015 Published by Elsevier B.V.


Shu-Jiang L.,Beijing National Data Center and Radionuclide Laboratory | Zhan-Ying C.,Beijing National Data Center and Radionuclide Laboratory | Yin-Zhong C.,Beijing National Data Center and Radionuclide Laboratory | Shi-Lian W.,Beijing National Data Center and Radionuclide Laboratory | And 2 more authors.
Journal of Chromatography A | Year: 2013

Multidimensional gas chromatography is widely applied to atmospheric xenon monitoring for the Comprehensive Nuclear-Test-Ban Treaty (CTBT). To improve the capability for xenon sampling from the atmosphere, sampling techniques have been investigated in detail. The sampling techniques are designed by xenon outflow curves which are influenced by many factors, and the injecting condition is one of the key factors that could influence the xenon outflow curves. In this paper, the xenon outflow curves of single-pulse injection in two-dimensional gas chromatography has been tested and fitted as a function of exponential modified Gaussian distribution. An inference formula of the xenon outflow curve for six-pulse injection is derived, and the inference formula is also tested to compare with its fitting formula of the xenon outflow curve. As a result, the curves of both the one-pulse and six-pulse injections obey the exponential modified Gaussian distribution when the temperature of the activated carbon column's temperature is 26°C and the flow rate of the carrier gas is 35.6mLmin-1. The retention time of the xenon peak for one-pulse injection is 215min, and the peak width is 138min. For the six-pulse injection, however, the retention time is delayed to 255min, and the peak width broadens to 222min. According to the inferred formula of the xenon outflow curve for the six-pulse injection, the inferred retention time is 243min, the relative deviation of the retention time is 4.7%, and the inferred peak width is 225min, with a relative deviation of 1.3%. © 2013 Elsevier B.V.


Fan Y.-Q.,Beijing National Data Center and Radionuclide Laboratory | Wang J.,Beijing National Data Center and Radionuclide Laboratory | Wang S.-L.,Beijing National Data Center and Radionuclide Laboratory | Zhang X.-J.,Beijing National Data Center and Radionuclide Laboratory | Li Q.,Beijing National Data Center and Radionuclide Laboratory
Applied Radiation and Isotopes | Year: 2012

The compton-suppression Spectrometer can suppress the Compton baseline and make weak full energy peaks prominent in low-level activity gamma spectra, so it is used to measure environmental radioactive samples. In order to quantify the activities of the radionuclides in the sample coincidence-summing corrections should be applied. In this article the expressions of coincidence-summing correction of Compton-Suppression Spectrometer were deduced and the validity of the expressions was verified. © 2012 Elsevier Ltd.


Wang S.-L.,Tsinghua University | Wang S.-L.,Beijing National Data Center and Radionuclide Laboratory | Bai T.,Northwest Institute of Nuclear Technology | Li Q.,Beijing National Data Center and Radionuclide Laboratory | And 6 more authors.
Applied Radiation and Isotopes | Year: 2012

The half-lives of 88Kr and 138Xe have been determined with two high purity germanium (HPGe) detectors by the position relay method. Data have been recorded at regular time intervals during measurements covering more than nine times the respective half-lives. This article describes in detail the principle and process of the position relay method with two HPGe detectors. The determined half-lives of 88Kr and 138Xe are 2.804±0.015h and 14.18±0.10min, respectively. © 2012 Elsevier Ltd.


PubMed | Beijing National Data Center and Radionuclide Laboratory
Type: Journal Article | Journal: Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine | Year: 2012

The compton-suppression Spectrometer can suppress the Compton baseline and make weak full energy peaks prominent in low-level activity gamma spectra, so it is used to measure environmental radioactive samples. In order to quantify the activities of the radionuclides in the sample coincidence-summing corrections should be applied. In this article the expressions of coincidence-summing correction of Compton-Suppression Spectrometer were deduced and the validity of the expressions was verified.


PubMed | Beijing National Data Center and Radionuclide Laboratory
Type: | Journal: Journal of chromatography. A | Year: 2013

Multidimensional gas chromatography is widely applied to atmospheric xenon monitoring for the Comprehensive Nuclear-Test-Ban Treaty (CTBT). To improve the capability for xenon sampling from the atmosphere, sampling techniques have been investigated in detail. The sampling techniques are designed by xenon outflow curves which are influenced by many factors, and the injecting condition is one of the key factors that could influence the xenon outflow curves. In this paper, the xenon outflow curves of single-pulse injection in two-dimensional gas chromatography has been tested and fitted as a function of exponential modified Gaussian distribution. An inference formula of the xenon outflow curve for six-pulse injection is derived, and the inference formula is also tested to compare with its fitting formula of the xenon outflow curve. As a result, the curves of both the one-pulse and six-pulse injections obey the exponential modified Gaussian distribution when the temperature of the activated carbon columns temperature is 26C and the flow rate of the carrier gas is 35.6mLmin(-1). The retention time of the xenon peak for one-pulse injection is 215min, and the peak width is 138min. For the six-pulse injection, however, the retention time is delayed to 255min, and the peak width broadens to 222min. According to the inferred formula of the xenon outflow curve for the six-pulse injection, the inferred retention time is 243min, the relative deviation of the retention time is 4.7%, and the inferred peak width is 225min, with a relative deviation of 1.3%.

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