Optimal measurement counting time and statistics in gamma spectrometry
          analysis: The time balance

Shouop, Cébastien Joel Guembou; Penabeï, Samafou; Moyo, Maurice Ndontchueng; Chêne, Grégoire; Mekontso, Éric Jilbert Nguelem; Takoukam, Serge Didier; Werner, V.; Strivay, David

doi:10.1063/1.4969040

Cited by 3 publications

(5 citation statements)

References 7 publications

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“…The Genie 2000 version V3.1 was used as the analysis software (Sima 1992; ‘Genie 2000 Operations Manual’, 2006; Sima 2012) and the activity concentration of each identified radionuclide was calculated using the following formula (Aoun et al 2015; Guembou Shouop et al 2017): where refers to the activity concentration of the radionuclide, refers to the count rate of the radionuclide in the analysed sample, refers to the count rate in the background, (the mass of the sample), (full energy peak efficiency), (emission probability), (cascade summing correction factor), (correction factor for self-attenuation), and K DC (decay correction factor for radionuclide). The activity concentration uncertainty (ΔA) was computed through the following equation: where Δ ( N , P , ε , and M ) refer to the uncertainties on the count rate, the emission probability, efficiency, and weighing, respectively (IAEA 2007; Guembou Shouop et al 2017; Joel et al 2017a, 2017b).…”

Section: Methodsmentioning

confidence: 99%

“…The prepared samples were kept in 120 mL cylindrical sealed containers and stored for one month to achieve a secular radioactive equilibrium before the analysis. The secular equilibrium was established because the activity concentration of some primordial radionuclides, such as Radium and Thorium, was obtained using daughter radionuclides from their decay chain (Ndontchueng et al 2014;Guembou Shouop et al 2017;Joel et al 2017a). The area of study is a continuous sedimentary basin in Cameroon and Nigeria that formed between the Cretaceous and the Miocene.…”

Section: Gamma Spectrometry Analysismentioning

confidence: 99%

Section: Sand Sampling and Preparationmentioning

confidence: 99%

“…where Δ (N, P, ε, and M) refer to the uncertainties on the count rate, the emission probability, efficiency, and weighing, respectively (IAEA 2007;Guembou Shouop et al 2017;Joel et al 2017aJoel et al , 2017b). An interesting way to evaluate the external exposure due to natural radioactivity in the investigated sand samples consisted of computing the radium equivalent activity (Ra eq ), the absorbed dose rate (ADR) and the annual effective dose equivalent (AEDE) using the appropriate conversion coefficients and the outdoor occupancy factors (Beretka and Mathew 1985;Örgün et al 2007;Ramasamy et al 2011;Joel et al 2017b).…”

mentioning

confidence: 99%

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Determination of the natural radioactivity, elemental composition and geological provenance of sands from Douala in the littoral region of Cameroon using X-ray and γ-ray spectrometry

Guembou

Moyo

Nguelem

et al. 2019

Applied Earth Science

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This study aimed to determine the concentration of natural radionuclides, the chemical composition, and the geological provenance of sand samples from seven large quarries within the Douala Basin and surrounding locations within the Littoral Region of Cameroon along the Gulf of Guinea. The analyses were undertaken on a total of 24 samples, using both gamma-and X-ray spectrometry techniques. Gamma spectrometric results indicated that the samples from the study area contained amounts of natural radioactivity that are less than the globally agreed safe limits. X-ray fluorescence spectrometry yielded quantitative major, minor, and trace element concentrations that were used in tectonic discrimination diagrams, indicating that these sediments were deposited in a passive margin environment. These concentration and natural radionuclide radioactivity level data provide a reference database for this region of Cameroon as well as for the wider Gulf of Guinea.

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Section: Methodsmentioning

confidence: 99%

Section: Gamma Spectrometry Analysismentioning

confidence: 99%

Section: Sand Sampling and Preparationmentioning

confidence: 99%

mentioning

confidence: 99%

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Determination of the natural radioactivity, elemental composition and geological provenance of sands from Douala in the littoral region of Cameroon using X-ray and γ-ray spectrometry

Guembou

Moyo

Nguelem

et al. 2019

Applied Earth Science

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“…MDA "a priori" for the energies of interest, calculated from the blank samples spectra When the MDA is higher than desired, it is necessary to increase the counting time with time optimization properly. Counting time optimization is the fastest, economical alternative and with a good accuracy to solve the problem [3,12,13,14,15]. The technique to be chosen to measure the radionuclide it has to be appropriate for the type of radiation and sensitive to demonstrate compliance with the criteria.…”

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 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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Radiological Assessment of Natural Radioactivity in a Uranium Deposit Area: Köprübaşi, Türkiye

Bıyık

Bingöldağ

Ataksor

et al. 2022

Radiation Protection Dosimetry

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In this study, the results of environmental radioactivity studies conducted in Köprübaşı, Manisa district, where Türkiye’s uranium mineral exploration and processing studies were carried out, are shared. Because this is a populated area, there is a need for radio ecological dosimetry assessment to investigate the possible risk to the population. The region where radiological monitoring is carried out is discussed in two parts as the areas where uranium mineral exploration is performed and the settlements close to these areas. It was observed that 714–4714 nGy/h values were obtained in the outdoor absorbed dose rate in air measurements taken in the areas where mineral exploration was performed and this value reached up to 22 857 nGy/h in open field mining areas. In the residential areas, it was recorded that the outdoor absorbed dose rate in air values ranged between 142 and 242 nGy/h and the indoor values ranged between 171 and 400 nGy/h. The world absorbed dose rate in air average values is 57 nGy/h (outdoor) and 75 nGy/h (indoor). The high 226Ra values in the radioactivity analyses of the soil samples draw attention. The mean values of the activity concentrations of the radionuclides 226Ra, 232Th and 40K in the soil samples are 3169, 55 and 802 Bq/kg and the world averages of these values are 35, 30 and 400 Bq/kg, respectively. It was determined that high 226Ra value in the soil in the areas close to the open field uranium mining area was passed on to the agricultural products. Radioactivity measurement results of drinking water samples did not exceed World Health Organization guidelines. According to the radon gas measurement results of 44 houses in Köprübaşı villages, the average radon concentrations in winter, spring, summer and autumn seasons were 72, 61, 50 and 55 Bq/m3, and the annual average value was 60 Bq/m3, respectively. Although these values are greater than the world average of 46 Bq/m3, they are below the recommended limit value (100 Bq/m3). By evaluating the data obtained, the total annual effective equivalent dose values (originating from outdoor–indoor absorbed dose in air, drinking water and indoor radon gas concentration) to which the people in the region are exposed were calculated as a 3.12 mSv.

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Optimal measurement counting time and statistics in gamma spectrometry analysis: The time balance

Cited by 3 publications

References 7 publications

Determination of the natural radioactivity, elemental composition and geological provenance of sands from Douala in the littoral region of Cameroon using X-ray and γ-ray spectrometry

Determination of the natural radioactivity, elemental composition and geological provenance of sands from Douala in the littoral region of Cameroon using X-ray and γ-ray spectrometry

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

Radiological Assessment of Natural Radioactivity in a Uranium Deposit Area: Köprübaşi, Türkiye

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