scholarly journals ASSESSMENT OF NATURAL RADIOACTIVITY AND RADIOLOGICAL HAZARD IN SEDIMENT BOTTOM OF EUPHRATES RIVER

2017 ◽  
Vol 5 (5) ◽  
pp. 68-92
Author(s):  
Mohammed H.ALTaweel ◽  
◽  
Y.Jabur Laith
Keyword(s):  
Natural Radioactivity ◽  
Radiological Hazard ◽  
Euphrates River ◽  
Sediment Bottom

scholarly journals Comparative Study of Natural Radioactivity and Radiological Hazard Parameters of Various Imported Tiles Used for Decoration in Sudan

Symmetry ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 746 ◽  
Author(s):  
Saifeldin Siddeeg ◽  
Mohamed Suliman ◽  
Faouzi Ben Rebah ◽  
Wissem Mnif ◽  
Amel Ahmed ◽  
...  
Keyword(s):  
Natural Radioactivity ◽  
Hazard Index ◽  
Absorbed Dose ◽  
Ceramic Materials ◽  
Radiological Hazard ◽  
Absorbed Dose Rate ◽  
Mean Values ◽  
Activity Concentrations ◽  
Materials Used ◽  
Hazard Parameters

Various commercially imported ceramic materials used in the building of Sudanese dwellings were examined in order to determine their natural radioactivity and radiological hazard parameters. In this context, twenty-five different consignments were sampled and analyzed using (3″ × 3″) sodium iodide gamma spectrometry system NaI(Tl). The identified average activity concentrations of 238U, 232Th, and 40K were 183 ± 70, 51 ± 44, and 238 ± 77 Bq/kg dry-weights, respectively. A positive correlation between 238U and 232Th in the investigated samples was identified from the observed significant correlation (R2 = 0.8). Interestingly, a low Th/U ratio (~0.3) was recorded, which could be related to the systematic loss of thorium during the fabrication process. The measured activity concentrations for these radionuclides were comparable with the reported data obtained from similar materials used in other countries showing similarity in ceramic materials used in buildings. Five different radiation indices, such as the average radium equivalent (Raeq), the absorbed dose rate (D), the annual effective dose equivalent (AEDE), the external hazard index (Hex), and the radioactivity level index (lγ), which indicate hazardous radiation, were estimated from these measurements. The obtained results revealed average values of 274 ± 106 Bq/kg, 125 ± 48 nGy/h, 1.23 ± 0.48 mSv/y, 0.74 ± 0.29, and 0.94 ± 0.37, for Raeq, D, AEDE, Hex, and lγ, respectively. The mean values of Raeq and Hex were in good agreement with the international limits, while the means of D and lγ were higher than the universal values. Calculated AEDE in about 60% of the samples exceeded the universal limit of 1 mSv/y for the public exposure (maximum value of 2.16 mSv/y). The investigated parameters were in the same range for the majority of imported samples; however, they were slightly higher than the locally produced ceramic, highlighting the importance of monitoring imported materials for their radioactivity contents.

scholarly journals Assessment of natural radioactivity levels and associated radiological hazard in scale and sludge from Jubilee oilfield of Ghana

2019 ◽  
Vol 11 (2) ◽  
pp. 143
Author(s):  
Rafael García Tenorio ◽  
Ignacio Vioque ◽  
Guillermo Manjón ◽  
Edith A. Amoatey ◽  
Augustine Faanu ◽  
...  
Keyword(s):  
Natural Radioactivity ◽  
Radiological Hazard ◽  
Radioactivity Levels

scholarly journals Radiological Hazard Evaluation of Some Egyptian Magmatic Rocks Used as Ornamental Stone: Petrography and Natural Radioactivity

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7290
Author(s):  
El Saeed R. Lasheen ◽  
Mohammed A. Rashwan ◽  
Hamid Osman ◽  
Sultan Alamri ◽  
Mayeen U. Khandaker ◽  
...  
Keyword(s):  
Natural Radioactivity ◽  
Residential Buildings ◽  
Granitic Rocks ◽  
Hazard Evaluation ◽  
Gamma Ray Spectrometry ◽  
Radiological Hazard ◽  
Absorbed Dose Rate ◽  
Ornamental Stone ◽  
Magmatic Rocks ◽  
Ornamental Stones

Magmatic rocks represent one of the most significant rocks due to their abundance, durability and appearance; they can be used as ornamental stones in the construction of dwellings. The current study is concerned with the detailed petrography and natural radioactivity of seven magmatic rocks. All are commercial granitic rocks and are identified as black Aswan, Nero Aswan, white Halayeb, Karnak, Verdi, red Hurghada and red Aswan. Their respective mineralogical compositions are classified as porpheritic granodiorite, granodiorite, tonalite, monzogranite, syenogranite, monzogranite and syenogranite. A total of nineteen samples were prepared from these seven rock types in order to assess their suitability as ornamental stones. Concentrations of 226Ra, 232Th and 40K radionuclides were measured using NaI (Tl) scintillation gamma-ray spectrometry. Among the studied magmatic rocks, white Halayeb had the lowest average values of 226Ra (15.7 Bq/kg), 232Th (4.71 Bq/kg) and 40K (~292 Bq/kg), all below the UNSCEAR reported average world values or recommended reference limits. In contrast, the other granitic rocks have higher values than the recommended limit. Except for the absorbed dose rate, other radiological hazard parameters including radium equivalent activity, annual effective dose equivalent, external, and internal hazard indices reflect that the White Halyeb rocks are favorable for use as ornamental stone in the construction of luxurious and high-demand residential buildings.

Comparing of the Natural Radioactivity in Soil Samples of University at Al-Husseineya and Al-Mothafeen Sites of Kerbala, Iraq

2021 ◽  
Vol 14 (2) ◽  
pp. 177-191
Keyword(s):  
Natural Radioactivity ◽  
Gamma Ray ◽  
Specific Activity ◽  
Soil Samples ◽  
Standard Errors ◽  
Radiological Hazard ◽  
Gis Technology ◽  
Mean Values ◽  
The Mean ◽  
Radiological Hazard Indices

Abstract: Radioactivity must be studied in soil to see the changes in the doses of human exposure. In this study, natural radioactivity and radiological hazard indices in soil samples of the Faculty of Agriculture (Al-Husseineya site) and the Faculty of Medicine (Al-Mothafeen site) in Kerbala Governorate were determined using gamma-ray spectroscopy. The results showed that the mean values of specific activity (in units of Bq/kg) and standard errors of: 238U, 232Th and 40K at Al-Husseineya site was 21.7±7.2, 9.43±3.2 and 335.8±82.2, respectively, while at Al-Mothafeen site, the mean values and standard errors were 22.4±8.8, 11.2±3.3 and 333.1±70.7, respectively. Radiation maps of natural radioactivity (238U, 232Th and 40K) at Al-Husseineya and Al-Mothafeen sites were mapped using geographic information system (GIS) technology. Moreover, most results in the present study fall within the acceptable levels, as defined by OCDE, UNSCEAR and ICRP. Therefore, there is no significant radiological hazard at the sites which were studied. Keywords: Radiological hazard, Natural radioactivity, Soil, NaI (Tl), Gamma-ray, Karbela University.

Determination of natural radioactivity in Euphrates river

2004 ◽  
Vol 261 (2) ◽  
pp. 349-355 ◽  
Author(s):  
M. S. Al-Masri ◽  
M. E. Byrakdar ◽  
S. Mamish ◽  
M. A. Al-Haleem
Keyword(s):  
Natural Radioactivity ◽  
Euphrates River

scholarly journals Assessment of Natural Radioactivity for Some Secondary Ceilings Samples in Iraq

2021 ◽  
Vol 877 (1) ◽  
pp. 012034
Author(s):  
Ali Saeed Al Rmahi ◽  
Ali Abid Abojassim
Keyword(s):  
Natural Radioactivity ◽  
World Wide ◽  
Gamma Ray ◽  
Specific Activity ◽  
Radiological Hazard ◽  
Mean Values ◽  
Hazard Risk ◽  
Two Samples ◽  
The World ◽  
Radiological Hazard Indices

Abstract This research focuses on measuring of specific activity of natural radioactive sources (238U, 232Th and 40K) in some types of secondary ceilings that used as a decorate material and available in Iraqi markets. The measurements were done using gamma ray spectroscopy system that based on NaI(Tl) Detector. Also, the radiological hazard indices have been assessed for all samples in present study. The results show that the specific activity vary from 8.7±0.6 to 32.9±2.3 Bq/kg for 238U, 2.9±0.2 to 40.3±1.5 Bq/kg for 232Th, and 117.4±2.6 to 649.1±7.9Bq/kg for 40K. The latter levels were compared with the world mean values that reported by the UNSCEAR 2008. It was found that all values of 238U and 232Th were below the world wide published values, while the values of only two samples of 40K were above the upper range of the world wide published values. Regarding the average values of radiological hazard risk were found to be within the permissible limit according to the OECD, UNSCEAR 2000, and ICRP. It can be concluded that natural radioactivity levels together with radiological hazard risk studied from the most of the secondary ceilings samples available in local markets of Iraq within natural rates of permissible limits and may not cause any danger to the human when being used.

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