Metrological capability of the Brazilian laboratories of analyses of radionuclides in environmental samples

The aim of this study is to determine an easy and fast method to calculate efficiencies in different volumes, in the same counting geometry, for gamma-ray spectrometry technique. Reference Material Soil IAEA 326 was packed in a 100 mL capacity polyethylene bottle with different masses and volumes, and sealed for about four weeks, prior measurement, in order to ensure that radioactive equilibrium had been reached between 226Ra and its progeny. After this time, they were measured by gamma-ray spectrometry with a hyper-pure germanium detector. The masses of the reference material used were 25, 60, 80, 95 and 128g. The energies of gamma-rays used in this paper are recommended due to the considerations: gamma intensity value, peak quality, spectral region without interference and the gamma- ray energies of the 238U and 232Th series very important for determining the natural radioactivity. The efficiency values obtained compared to the adjusted efficiency values were similar and presented a good correlation coefficient. The performance was acceptable for all different masses studied, indicating results consistent for the method. The proposed method could be useful as a tool for laboratories, dealing with of samples on a routine basis, by reducing the cost on the purchase of another counting geometry and optimizing the use of the detection system, thus improving their performance.

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Section: Methodsmentioning

confidence: 99%

“…The criteria used in the performance evaluation are the normalized deviation (E), when │E│< 1 the result is consistent [8]. The normalized deviation, E, was evaluated by the equation (3).…”

Section: Figmentioning

confidence: 99%

Counting efficiency in gamma-ray spectrometry with different sample volumes for the same geometry

Nisti

Máduar²,

Damatto³

et al. 2022

Braz. J. Rad. Sci.

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“…The performance of the gamma-ray spectrometry measurements was evaluated by participation in proficiency tests for Brazilian laboratories, organized by Instituto de Radioproteção e Dosimetria (IRD), which is available on a routine basis three times per year [8]. in the sample spectrum (cps) and background radiation of the detection system (cps) for each radionuclide were calculated using equation 1.…”

Section: Methodsmentioning

confidence: 99%

Optimization of the gamma-ray spectrometry counting time based on uncertainties of radionuclides concentration in samples

et al. 2020

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This paper aims to propose an easy and fast method of optimization of the gamma-ray spectrometry counting time in determining natural radionuclides (Pb-210, Pb-212, Pb-214, Bi-212, Bi-214 and Ac-228) in order to minimize uncertainties in the concentration. The samples were measured by gamma-ray spectrometry with a hyper-pure germanium detector Canberra, 25% relative efficiency, effective resolution of 1.9 keV on the 1332.5 keV 60Co with associated electronics and coupled to a microcomputer. Multichannel Maestro A65-I model was used for spectrum acquisition and peak net area determination, and WinnerGamma/Interwinner 6.01 software was used for gamma-ray spectra analysis and to calculate the concentrations and associated uncertainties. The counting times used were 86,000 s and 150,000 s.

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“…DOE, had their reference values already established by these institutions. All these samples are distributed to the participant laboratories by IRD (Tauhata et al, 2002;Vianna et al, 1995Vianna et al, , 1998.…”

Section: Introductionmentioning

confidence: 99%

The Brazilian National Intercomparison Program (PNI/IRD/CNEN): evaluation of 15 years of data

Tauhata

Vianna

Oliveira

et al. 2006

Journal of Environmental Radioactivity

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Metrological capability of the Brazilian laboratories of analyses of radionuclides in environmental samples

Cited by 12 publications

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Counting efficiency in gamma-ray spectrometry with different sample volumes for the same geometry

Counting efficiency in gamma-ray spectrometry with different sample volumes for the same geometry

Optimization of the gamma-ray spectrometry counting time based on uncertainties of radionuclides concentration in samples

The Brazilian National Intercomparison Program (PNI/IRD/CNEN): evaluation of 15 years of data

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