Assessment of natural radioactivity and associated radiation hazards in some Cameroonian building materials

Ngachin, M.; Garavaglia, M.; Giovani, C.; Njock, M.G. Kwato; Nourreddine, A.

doi:10.1016/j.radmeas.2006.07.007

Cited by 121 publications

(58 citation statements)

References 23 publications

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“…A similarly sealed empty container of the same geometry was left for the same time period in order to measure the radionuclide background [15]. itself [16][17][18][19][20][21]. The specific activity concentration (Bq kg −1 ) of those radionuclides was calculated from (1) [15].…”

Section: Sample Preparationmentioning

confidence: 99%

Comparison of Natural Radioactivity of Commonly Used Fertilizer Materials in Egypt and Japan

Hassan

Chang

Tokonami

2017

Journal of Chemistry

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Specific activities of238 U, 232 Th, and 40 K in the environment have been redistributed by the use of fertilizers in agriculture so their concentrations in fertilizer materials should be measured to identify the safe utilization of fertilizers. In the present work, the specific activities of these radionuclides in five commonly used fertilizers in Egypt and five fertilizers used in Japan were measured by HPGe and -ray spectrometry. The average values of 238 U, 232 Th, and 40 K in Japanese fertilizers were less than their values in Egyptian fertilizers but both had some samples with specific activities greater than the recommended limiting values. The radiological hazards of radium equivalent activity (Ra eq ), external ( ex ) and internal ( in ) indexes, alpha and gamma indexes, and annual effective dose, due to the presence of these radionuclides, were calculated and compared with each other.

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Section: Sample Preparationmentioning

confidence: 99%

Comparison of Natural Radioactivity of Commonly Used Fertilizer Materials in Egypt and Japan

Hassan

Chang

Tokonami

2017

Journal of Chemistry

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“…Tyto parametry byly z výsledků gamaspektrometrických analýz vypočteny pomocí vztahů a m [Bq.kg (Beretka -Matthew 1985;UNSCEAR 1988;Matolín -Chlupáčová 1997;Ngachin et al 2007;Eštoková -Palaščáková 2013).…”

Section: Vzorky a Metodyunclassified

Uran, thorium a draslík v krystaliniku a paleozoických sedimentech na mapovém listu 14-33 Polička – laboratorní gamaspektrometrie a parciální chemické složení variských plutonitů

Zimák

2017

Geologické výzkumy

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The paper deals with natural radioactivity of metamorphic and igneous rocks and Palaeozoic sediments within the map sheet 14-33 Polička. Studied rocks belong to three geological units: the Hlinsko Zone (phyllites and quartzites of the Mrákotín Fm., flysch sediments of the Hlinsko-Rychmburk Fm.), the Svratka Crystalline Complex (mainly mica schists, paragneisses, orthogneisses and migmatites, also amphibolites, skarns, erlans and quartzites) and the Polička Crystalline Complex (mica schists, paragneisses to migmatites and the Variscan granitoids are dominant). Concentrations of potassium, uranium and thorium were measured using a laboratory gamma-ray spectrometer in 805 rock samples. Data are tabled and discussed. Natural radioactivity of rocks is evaluated on the basis of the calculated values of mass activity of 226Ra equivalent (am). Slightly increased am values were found in migmatites and orthogneisses of the Svratka Crystalline Complex (187 Bq.kg-1 on average), granites and granodiorites of the Budislav Pluton (216 Bq.kg-1), granodiorites and rocks of a tonalite suite of the Miřetín Pluton (199 and 194 Bq.kg-1). Increased concentrations of uranium and thorium were found in some samples of pegmatite and aplite. Radioactivity of rocks of the Hlinsko-Rychmburk and Mrákotín Fms. can be assessed as relatively low.

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“…This has a potential of causing health hazards to the public living in houses, offices, class rooms etc build from shore sediments [8] [9]. The levels of natural radionuclides present in sediments may have an adverse effect to the wellbeing of people living in the environment [14]. The adverse effect of gamma irradiation dose on mammalian [15], they used a mathematical model to determine their dielectric dispersion properties.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Radionuclide Content of Shore Sediments Collected from the Bank of River Benue, North-Central Nigeria

Sombo¹,

Emmanuel²,

Ugwuanyi³

2017

GEP

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Ionizing Radiation emitted from radionuclide has an adverse effect on human health. A continuing population exposure to naturally occurring radioactive materials (NORMS) found in our environment is one of the major scientific subjects that attract public attention. The assessment of radionuclide content of shore sediments of river Benue-North Central Nigeria was carried out using gamma-ray spectrometry. The activity concentrations of U-238, Th-232 and K-40 were found to have an average concentration of 1.17, 3.31 and 405.95 Bq•kg −1 respectively. The values gotten from present study were compared with the world average values. World average values of U-238, Th-232 and K-40 are 50 Bq•kg −1 , 50 Bq•kg −1 and 500 Bq•kg −1 respectively. The mean concentration of daughter radionuclides generated from U-238, Th-232 was 4. 32, 10.37, 5.24, 3.86, 11.87, respectively. The mean of the absorbed dose, Annual effective dose equivalent, for radium equivalent activity, and external hazard index, were evaluated to be 19.45 nGy•h −1 , 23.82 µSv•y −1 , 37.16 Bq•kg −1 , 0.10 mSv•y 1 , below the permissible limit of 57 nGy•h −1 , 70 μSv•y −1 , 370 Bq•kg −1 and 1 mSv•y −1 respectively. These shore sediments from river Benue are therefore, radiologically safe for construction and other domestic and industrial purposes.

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Assessment of natural radioactivity and associated radiation hazards in some Cameroonian building materials

Cited by 121 publications

References 23 publications

Comparison of Natural Radioactivity of Commonly Used Fertilizer Materials in Egypt and Japan

Comparison of Natural Radioactivity of Commonly Used Fertilizer Materials in Egypt and Japan

Uran, thorium a draslík v krystaliniku a paleozoických sedimentech na mapovém listu 14-33 Polička – laboratorní gamaspektrometrie a parciální chemické složení variských plutonitů

Assessment of Radionuclide Content of Shore Sediments Collected from the Bank of River Benue, North-Central Nigeria

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