Application of NaI(Tl) detector for measurement of natural radionuclides and 137Cs in environmental samples: new approach by decomposition of measured spectrum

Muminov, I. T.; Muhamedov, A. K.; Osmanov, B.; Safarov, A. A.; Safarov, A. N.

doi:10.1016/j.jenvrad.2005.02.017

Cited by 11 publications

(8 citation statements)

References 2 publications

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“…NaI(Tl) detectors are also being extensively used for the estimation of long lived fall out fission product nuclides like 137 Cs in environmental samples. Many gamma spectrometric methods are developed to experimentally determine these radio nuclides in samples employing different type of scintillation detectors [2,3]. The poor energy resolution of these detectors makes the analysis of the complex gamma ray spectrum very difficult especially when many nuclides are present.…”

Section: Introductionmentioning

confidence: 99%

Application of simulated standard spectra for the analysis of complex sample spectra from NaI(Tl) detectors

Anilkumar

Narayani

Verma

et al. 2014

J Radioanal Nucl Chem

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The most accurate method for the analysis of complex gamma ray spectra from scintillation detectors is least squares method. The major requirement of this method is individual standard spectra of all nuclides expected in the complex spectrum which is not possible and feasible for some nuclides. In the present work, an approach of using simulated standard spectrum of the radionuclides for the least squares analysis is studied. The paper describes the methodology used for the generation of simulated spectrum which is the main objective, and validation of results using standard sources in the Sodium Iodide (NaI(Tl)) based gamma ray spectrometer.

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Section: Introductionmentioning

confidence: 99%

Application of simulated standard spectra for the analysis of complex sample spectra from NaI(Tl) detectors

Anilkumar

Narayani

Verma

et al. 2014

J Radioanal Nucl Chem

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“…Further investigations are therefore carried out to improve the ability of a NaI(Tl) spectrometry for quantitative determination of radioelements. But even the method presented by Muminov et al (2005) still is based on subtraction of spectra and by taking into account mainly the total absorption peak. On the other hand, radioactive decay obeys Poisson statistics stating the relative error for n counts to be 1= ffiffiffi n p .…”

Section: Introductionmentioning

confidence: 99%

Multi-group approximation, scattering and calibration coefficients, uncertainty estimates and detection limits of a NaI(Tl)-based gamma spectrometry set-up for low-level activity analysis

Owono

2010

Journal of Environmental Radioactivity

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“…1) the measured spectra (1) into background (2), 226 Ra (3), 232 Th (4), and 40 K (5) components contained in the sample. To do this, we used time-normalized measurements of the spectra of inert samples (a Marinelli vessel filled with table salt) and standard samples of 226 Ra, 232 Th, and 40 K from the OMASN kit filled to densities similar to those of the samples being studied and the formula S n = S -F -Ra -Th -K [2], where S is the measured spectrum, F is the background spectrum, and Ra, Th, and K are the spectra of 226 Ra, 232 Th, and 40 K, respectively. The activities of the standard sources were A Ra = 2580 ± 180, A Th = 10 ± 4, A K = 560 ± 60, and A U = 90 ± 20 Bq/kg.…”

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confidence: 99%

Radioactivity and elemental composition of slag from ancient metallurgical production

et al. 2008

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Mines, works, water rock-crushing mills, furnaces for smelting of metals (gold, silver, lead, copper, zinc, mercury, iron), and fields of slag dumps dating from the 1st through the 19th centuries have been found in more than 50 places in the Chatkalo-Kuraminskii mining district (Tashkent Oasis) [1].The goal of the present work is to determine the specific activity of natural radionuclides in the uranium-thorium families and 40 K and to establish the elemental composition in samples of slag taken from dumps in the basins of the Bashkyzylsai River and its tributary, the Kyzylalmasai in the foothills of the Chatkal range, dating to the 5-7th centuries and from tributaries of the Akhangaran-Karabau and Karasarai Rivers in the foothills of the Kuraminskii Range, dating to the 11-12th centuries. The radionuclide composition of the samples was determined by γ-ray spectroscopy and the elemental composition, by neutron activation and x-ray spectral analysis.Two forms of samples were taken by quartering: vitrified slag in the form of solidified streams with smooth surfaces (initially extracted from the bottom of a smelter furnace) and slag with a porous structure formed on a molten metal surface. The color of the slag varied from black to dark gray. The overall number of samples was 27, each with a mass of 2 kg. The samples were first ground up in a agate mortar to a powder with a grain size of ≤10 µm and packaged in polyethylene bags. Samples with a mass of 1.5 kg, ground to a grain size of 5 mm and packed in sealed, one-liter Marinelli vessels, were used for the γ spectroscopy studies. The 50-mg samples for neutron activation analysis were packed in polyethylene bags and samples for x-ray spectroscopic analysis were prepared by drying 500 mg ground samples in vacuum and then adding 50 mg of boric acid. Samples in the form of 10 × 2 mm tablets were prepared by pressing (3 tons/cm 2 ) the carefully blended mixture.The radioactivity of the samples was measured in a Marinelli geometry using a scintillation gamma-ray spectrometer equipped with a 63 × 63 mm NaI(Tl) crystal (10% energy resolution at the E γ = 661 keV 137 Co line) and mounted in a lead box with 10-cm-thick walls. The γ-ray spectrum of each sample was accumulated over a period of 6 h. The instrument

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Application of NaI(Tl) detector for measurement of natural radionuclides and 137Cs in environmental samples: new approach by decomposition of measured spectrum

Cited by 11 publications

References 2 publications

Application of simulated standard spectra for the analysis of complex sample spectra from NaI(Tl) detectors

Application of simulated standard spectra for the analysis of complex sample spectra from NaI(Tl) detectors

Multi-group approximation, scattering and calibration coefficients, uncertainty estimates and detection limits of a NaI(Tl)-based gamma spectrometry set-up for low-level activity analysis

Radioactivity and elemental composition of slag from ancient metallurgical production

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