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Journal of Environmental Protection 2023年第3期14卷 127-138页

作者： ponaho Claude kezo Issa Konate Tekpo Paul Dali Laboratory of Environmental Science and Technology Université Jean Lorougnon Guédé Daloa Côte d’Ivoire Laboratory of Environmental and Solar Energy Sciences Université Félix Houphouët-Boigny Abidjan Côte d’Ivoire

In order to assess public effective dose due to gross alpha and beta in water, 43 tap water samples were collected from different areas in the District of Abidjan. Using the low background Gas-less Automatic Alpha/Beta counting system (Canberra iMaticTM) for analysis, the gross alpha and beta concentrations found varied from 0.001 ± 0.002 to 0.063 ± 0.050 Bq/l with an average of 0.013 ± 0.012 Bq/l and from 0.067 ± 0.080 to 0.320 ± 0.120 Bq/l with an average of 0.174 ± 0.076 Bq/l, respectively in samples. The public effective dose assessment showed values of dose to ingestion of alpha and beta emitter radionuclides lower than the recommended value of dose for drinking water 0.1 mSv/y, except in 30% of the samples. These results show the need for additional studies to be conducted in order to clarify the hazardousness of these water samples. However, this study still remains important because it has provided necessary data for future tap water quality monitoring studies in the District of Abidjan.

关键词： Gross Alpha and Beta Concentration Tap Water Effective Dose District of Abidjan

Gross Alpha and Beta Activities and Related Lifetime Risks Assessment Due to Ingestion of Drinking Water from Different Sources in the District of Abidjan, Cote d’Ivoire

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World Journal of Nuclear Science and Technology 2024年第1期14卷 86-96页

作者： ponaho Claude kezo Issa Konate Dabo Salif Ignace Agba Laboratory of Environmental Science and Technology University Jean Lorougnon Guede (UJLoG) Daloa C&#244te d’Ivoire Laboratory of Environmental and Solar Energy Sciences University Felix Houphouet Boigny (UFHB) Abidjan C&#244te d’Ivoire Laboratory of Fundamental and Applied Physics University Nangui Abrogoua (UNA) Abidjan C&#244te d’Ivoire

Drinking good quality water is essential for better health. It is therefore essential to assess the radiological quality of all water consumed in the District of Abidjan in order to prevent related hazards. Thus, the objective of this study was to assess the risk of cancer due to the ingestion of alpha and beta emitting radionuclides in the different types of water consumed in the region. A total of 63 water samples with 43 tap water samples, 5 bottled mineral water and 15 sachet water samples was collected and taken to GAEC laboratory for analysis. The low background Gas-less Automatic Alpha/Beta counting system (Canberra iMaticTM) was used to determine alpha and beta activity concentrations. Activity concentrations of both gross alpha and gross beta obtained in water sample were respectively lower than the WHO recommended limits of 0.1 Bq/l and 1 Bq/l. Also, the annual effective dose and total equivalent effective dose found in mineral bottled water samples were higher than in other types of water. The assessment of radiological lifetime risk has shown values of cancer risk due to ingestion alpha and beta emitters lower than recommended limit. These results indicate that there is no health hazard associated to consumption of water in the District of Abidjan.

关键词： Gross Alpha and Beta Activities Drinking Water Effective Dose Radiological Lifetime Risks

Comparative Alpha Tracks Counting Using an Optical Microscope and a Spark Counter

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Detection 2023年第2期10卷 7-18页

作者： Dabo S. I. Agba ponaho kezo Issa Konaté Laboratory of Fundamental and Applied Physics University Nangui Abrogoua Abidjan Cote d’Ivoire Laboratory of Environmental Science and Technology University Jean Lorougnon Guede Daloa Cote d’Ivoire Nuclear Physics and Radiation Protection Team Laboratory of Matter Sciences Environment and Solar Energy University Félix Houphou&#235t Boigny Abidjan Cote d’Ivoire

In the metrology of radon, an environmental lung carcinogen, the integrated measurements necessary for epidemiological studies are made very often using the tracks detector LR 115 type 2. For dosimetric analysis, the etched tracks from radon alpha particles on this detector are usually counted by means of an optical microscope or a spark counter. An optimal reading of the track densities which must be converted into radon concentrations, can’t be done without a good mastery of the mode of operation and use of these devices. Furthermore, investigations to know as to whether or not each of those can be used to determine radon concentration are necessary. These are the objectives of the present work in which LR 115 samples exposed to radon for at least 3 months, were chemically developed under standard conditions and read. The track densities obtained with the microscope are very much higher than those of the counter for each sample. These results are consistent with those published by other authors. However, each of these devices can be used interchangeably for alpha tracks counting, as both provide radon concentrations with a very good linear correlation coefficient of 0.95 taking into account their respective calibration factors for the reading of this detector. In addition, the saturation phenomenon for the spark counter reading of LR 115 detector occurs beyond 11,000 tr/cm2, a density never reached during our environmental radon measurements.

关键词： LR 115 Detector Optical Microscope Spark Counter Alpha Track Density Calibration Factor Radon Concentration

Elemental Composition of PM_2.5 and PM₁₀ in the Industrial Area of Yopougon, Abidjan, Côte d’Ivoire

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Journal of Environmental Protection 2022年第6期13卷 385-397页

作者： Alloman Joseph Popouen Abdelfettah Benchrif ponaho Claude kezo Djama Djoman Alfred Agbo Aka Antonin Koua Moussa Bounakhla Alain Georges Monnehan Laboratoire des Sciences de la Matiè re de l’Environnement et de l’Energie Solaire Universit&eacute Fé lix Houphouë t Boigny Abidjan C&ocirc te d’Ivoire National Centre for Nuclear Energy Science and Technology (CNESTEN) Direction of Studies and Scientific Researches Rabat Morocco Laboratoire des Sciences et Technologies de l’Environnement Universit&eacute Jean Lorougnon Gué dé Daloa C&ocirc te d’Ivoire Autorité de Radioprotection de S&ucirc reté et Sé curité Nuclé aires Abidjan C&ocirc te d’Ivoire

This paper describes the evaluation of trace element composition of atmospheric aerosol particles (PM2.5 and PM10) and their influence on air quality in the largest industrial area of Abidjan city, C?te d’Ivoire. Multi-week sampling was conducted in an urban site (industrial area) in Abidjan from April 2018 to July 2019. The mean mass concentration was 48.83 ± 15.24 μg/m3 for PM2.5 and 77.34 ± 10.91 μg/m3 for PM10, with significant temporal variability. The average ratio of PM2.5/PM10 was 0.64 ± 0.21. The concentration of BC in PM2.5 and PM10 was respectively 52.32 ± 7.48 μg/m3 and 52.26 ± 12.07 μg/m3. Twenty-two elements: Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Rb, Sr, Zr and Pb were analysed by Energy Dispersive X-ray Fluorescence (EDXRF). Elemental composition data were modeled using principal component analysis (PCA) with varimax rotation to determine two (2) and four (4) dominant source categories contributing to PM2.5 and PM10 respectively. In the case of fine particles PM2.5, the possible sources were Industrial activities and non-exhaust emissions, exhaust emissions. The PM10 sources were industrial activities and non-exhaust emissions, industrial processes, mineral dust, and waste combustion.

关键词： Aerosol Particles PM2.5 PM10 EDXRF PCA