scholarly journals COMPARISON OF ACTIVITY CONCENTRATIONS OF NATURAL RADIONUCLIDES IN SOILS COLLECTED AT DIFFERENT DEPTHS OF SELECTED HAND-DUG WELLS IN ABEOKUTA

2017 ◽  
Vol 15 (2) ◽  
pp. 119-130
Author(s):  
I C OKEYODE ◽  
A O MUSTAPHA ◽  
N N JIBIRI ◽  
V MAKINDE ◽  
F G AKINBORO ◽  
...  
Keyword(s):  
Activity Concentration ◽  
Gamma Ray ◽  
Natural Radionuclides ◽  
Soil Samples ◽  
High Purity Germanium ◽  
Activity Concentrations ◽  
Dug Wells ◽  
Different Depths ◽  
Average Activity ◽  
Dug Well

This study was aimed at measuring and comparing the activity concentration of soil samples collected from some selected hand – dug wells with their corresponding depths of collection in Abeokuta metropolis. Total of twenty (20) soil samples were collected from hand-dug wells in five sites (Obada, Adigbe, Kuto, Olorunsogo, and Obantoko) within Abeokuta with four (4) soil samples from each hand-dug well at the surface, (0.0m) through to 2.25m depth. Gamma ray spectroscopy with High Purity Germanium (HPGe) detector was used for the measurements. The average activity concentrations obtained for the three natural radionuclides 226Ra, 232Th and 40K in Bq/Kg are 34.31 ± 2.01, 128.73 ± 4.41 and 152.31 ± 2.59 respectively at depth 0.00 m (surface), 23.00 ± 1.61, 68.39 ± 3.24 and 191.08 ± 3.11 respectively at depth 0.75 m, 31.52 ± 2.21, 145.37± 4.95 and 375.56 ± 5.50 respectively at 1.50 m and lastly 28.57±1.70, 95.61 ± 3.71 and 181.10 ± 3.94 respectively at 2.25 m depth. The world average activity concentrations for 226Ra, 232Th and 40K are given to be 35 Bqkg-1, 30 Bqkg-1 and 400 Bqkg-1 respectively (UNSCEAR 2000). 232Th showed  higher average values than the world’s average while averages of 226Ra and 40K were lower but most of the activity concentration values obtained in some of the locations are higher than the world’s average values, especially 226Raand 232Th in the soil samples. 

scholarly journals Determination of natural radioactivity in soil samples around gold mining area in Khamkeut district, Bolikhamxay Province, Laos using gamma ray spectrometer with NaI(Tl) detector

2018 ◽  
Vol 34 (3) ◽  
Author(s):  
Somsavath LEUANGTAKOUN
Keyword(s):  
Gamma Ray ◽  
Natural Radionuclides ◽  
Mining Area ◽  
Soil Samples ◽  
Gold Mines ◽  
Gamma Ray Spectrometer ◽  
Activity Concentrations ◽  
Radium Equivalent ◽  
Average Activity

This paper presented the method of determining the radioactivity of 40K, 226Ra and 232Th in soil samples by gamma-ray spectrometer using NaI (Tl) scintillation detector. The radioactivity of each isotope is calculated based on the net count rate in the energy window characteristic for the 40K, 226Ra and 232Th radioisotopes respectively. We have determined  activity concentrations of the natural radionuclides 226Ra,232Th and 40K in 15 soil samples collected around gold mines of Khamkeut district, Bolikhamxay Province, Laos. The average activity concentrations of the natural radionuclides 226Ra, 232Th and 40K are 46.58  ±  7.36 , 71.19  ±  5.42 and 574.62  ±  25.02 Bq.kg-1, respectively. The average activity concentrations of 226Ra and 232Th in this work are higher than those of Bolikhamxay Province, Laos and the world average values. The estimated average outdoor annual effective dose (E) and radium equivalent actitvity (Raeq) are 0.10  ±  0.004 mSv.yr-1 and 192.64  ±  16.12 Bq.kg-1, respectively.

scholarly journals Natural radioactivity and external dose assessment of surface soils in Bolikhamxay province, Laos

2017 ◽  
Vol 33 (4) ◽  
Author(s):  
Loat Bui Van
Keyword(s):  
Activity Concentration ◽  
Natural Radionuclides ◽  
Soil Samples ◽  
Dose Assessment ◽  
World Average ◽  
Average Value ◽  
Activity Concentrations ◽  
Radium Equivalent ◽  
The World ◽  
Average Activity

We have determined activity concentrations in 33 soil samples collected from Bolikhamxay Province, Laos. The activity concentrations of the natural radionuclides 226Ra,232Th and 40K in soil samples were measured by a gamma spectrometer with a HPGe detector. The average activity concentrations of the natural radionuclides 226Ra, 232Th and 40K are 43.8 ± 5.6, 57.0 ± 7.3 and 426.4 ± 23.1 Bq.kg-1, respectively. The average activity concentrations of 226Ra and 232Th in this work are higher than those of the world average values. Meanwhile, the  activity concentration of 40 K is almost the same of the world average value. The estimated average outdoor annual effective dose (E) and radium equivalent actitvity (Raeq) are 0.17 ± 0.02 mSv.yr-1 and 154.8 ± 16.1 Bq.kg-1, respectively.

NATURAL RADIONUCLIDES IN SOIL AND ROOT VEGETABLES IN MALAYSIA: TRANSFER FACTORS AND DOSE ESTIMATES

2019 ◽  
Vol 188 (1) ◽  
pp. 47-55
Author(s):  
Abdul Majeed Muidh Al Mutairi ◽  
Norlaili A Kabir
Keyword(s):  
Significant Variation ◽  
Gamma Ray ◽  
Natural Radionuclides ◽  
Soil Samples ◽  
Dose Assessment ◽  
Transfer Factors ◽  
Activity Concentrations ◽  
Effective Doses ◽  
Average Activity ◽  
Root Vegetables

Abstract Tapioca and sweet potato are the fourth and fifth most consumed crops in Malaysia. The activity concentrations of natural radionuclides in these vegetables were assessed from two regions in Malaysia (Kedah and Penang) along with soil samples using gamma ray spectroscopy. The transfer factors of 226Ra, 232Th and 40K from soil to vegetables were calculated, and a dose assessment was performed. The activity concentrations of 226Ra, 232Th and 40K in soil samples did not show a significant variation with the regions investigated, and the average values obtained, in Bq/kg, (±SD) were as follows: 80 ± 41, 56 ± 12, 516 ± 119, respectively. The respective average activity concentrations in vegetables were as follows, in Bq/kg: (±SD) 2.0 ± 0.5, 6 ± 2, 153 ± 49. The corresponding transfer factors were calculated to be 0.03, 0.11 and 0.31 for 226Ra, 232Th and 40K, respectively. The average annual effective doses due to the exposure from soil and ingestion of vegetables were found to lie within the worldwide ranges.

scholarly journals Determination of the activity concentration levels of the artificial radionuclide137Cs in soil samples collected from Qatar using high-resolution gamma-ray spectrometry

2016 ◽  
Vol 44 ◽  
pp. 1660237
Author(s):  
Huda Al-Sulaiti ◽  
Tabassum Nasir ◽  
K. S. Al Mugren ◽  
N. Alkhomashi ◽  
N. Al-Dahan ◽  
...  
Keyword(s):  
High Resolution ◽  
Nuclear Power ◽  
Activity Concentration ◽  
Gamma Ray ◽  
Germanium Detector ◽  
Soil Samples ◽  
Gamma Ray Spectrometry ◽  
Activity Concentrations ◽  
High Resolution Gamma

The goal of this study was to establish the first baseline measurements for radioactivity concentration of the artificial radionuclide [Formula: see text]Cs in soil samples collected from the Qatarian peninsula. The work focused on the determination of the activity concentrations levels of man-made radiation in 129 soil samples collected across the landscape of the State of Qatar. All the samples were collected before the most recent accident in Japan, “the 2011 Fukushima Dai-ichi nuclear power plant accident”. The activity concentrations have been measured via high-resolution gamma-ray spectrometry using a hyper-pure germanium detector situated in a low-background environment with a copper inner-plated passive lead shield. A radiological map showing the activity concentrations of [Formula: see text]Cs is presented in this work. The concentration was[Formula: see text]found to range from 0.21 to 15.41 Bq/kg. The highest activity concentration of [Formula: see text]Cs was observed in sample no. 26 in North of Qatar. The mean value was found to be around 2.15 ± 0.27 Bq/kg. These values lie within the expected range relative to the countries in the region. It is expected that this contamination is mainly due to the Chernobyl accident on 26 April 1986, but this conclusion cannot be confirmed because of the lack of data before this accident.

scholarly journals Estimation of radioecological parameters of soil samples from a phosphatic area

2016 ◽  
Vol 31 (2) ◽  
pp. 165-172 ◽  
Author(s):  
Shaaban Harb ◽  
Noor Ahmed ◽  
Wael Badawy ◽  
Nagwa Saad
Keyword(s):  
Dose Rate ◽  
Annual Effective Dose ◽  
Natural Radionuclides ◽  
Significant Risk ◽  
Absorbed Dose ◽  
Soil Samples ◽  
Absorbed Dose Rate ◽  
Activity Concentrations ◽  
Average Activity ◽  
Range Of Values

The activity concentrations of natural radionuclides (226Ra, 232Th, and 40K) for a set of 31 agricultural soil samples from the Nile River banks in the area of El-Sebaiya city, Aswan Governorate, Egypt were measured by gamma-spectrometry. The study revealed that the average activity concentrations of natural radionuclides 226Ra, 232Th, and 40K were 23.2 ? 2.8Bq/kg, 21.1 ? 2.8 Bq/kg, and 218.6 ? 3.7 Bq/kg, respectively. The obtained results of the activity concentrations are within the range of values reported for neighbouring areas in Egypt. The values obtained for the hazard indices and the representative level index in all sampling sites were lower than unity, showing that there is no significant risk arising from the exposure to the soil in the studied area. The absorbed dose rate and annual effective dose in air outdoors and indoors were calculated from 226Ra, 232Th, and 40K in soil, the average values being 32.64 nGy/h, 40.06 ?Sv, and 160.25 ?Sv, respectively. The absorbed dose rate at the eastof El-Sebaiya city is higher than that obtained for the west because of higher concentrations of tri-calcium phosphate in the soil. The studied area is not significantly affected by the industrial activities, except for a few isolated spots.

NATURAL RADIONUCLIDES IN AGRICULTURAL PLANTS FROM NORTHERN THAILAND

2019 ◽  
Vol 184 (3-4) ◽  
pp. 397-399
Author(s):  
R Kritsananuwat ◽  
C Kranrod ◽  
S Chanyotha ◽  
T Ploykrathok ◽  
P Sriploy
Keyword(s):  
Gamma Ray ◽  
Natural Radionuclides ◽  
Northern Region ◽  
Soil Samples ◽  
Gamma Ray Spectrometry ◽  
Northern Thailand ◽  
Activity Concentrations ◽  
Plant Samples ◽  
Spectrometry Technique ◽  
Agricultural Plants

Abstract Thailand is predominantly an agricultural country. The Northern Region occupies the second largest cultivated land area in the country. To establish baseline data for future environmental monitoring, seventy-nine plant samples including vegetables, fruits and tobaccos and their relevant soils were collected from the major plantation zones of Northern Thailand. Activity concentrations of natural radionuclides in the samples were determined using gamma-ray spectrometry technique. The median activity concentrations of 226Ra and 228Ra in the soil samples were higher than worldwide value, while as those of 40K were comparable with worldwide value. There was a large variation and non-uniform distribution in the soil samples. The activity concentrations of 226Ra, 228Ra and 40K in the plant samples varied widely within plants and between species and were very low compared to their relevant soils. A decreasing trend of their activity concentration has been observed in the order leaf > stem > rhizome/root (as found in galangal); and leaf > stalk/stem (as found in lemongrass).

scholarly journals Radioactivity of some building and raw materials used in Croatia

2011 ◽  
Vol 13 (3) ◽  
pp. 23-27 ◽  
Author(s):  
Tahir Sofilić ◽  
Delko Barišić ◽  
Una Sofilić ◽  
Marija Đuroković
Keyword(s):  
Activity Concentration ◽  
Gamma Ray ◽  
Raw Materials ◽  
Coal Fly Ash ◽  
Radium Equivalent Activity ◽  
Gamma Ray Spectrometer ◽  
Activity Concentrations ◽  
Radium Equivalent ◽  
Average Activity ◽  
Materials Used

Radioactivity of some building and raw materials used in Croatia In the present study, the activity concentrations of 226Ra, 232Th, 40K in some building and raw materials used in Croatia were measured by using a gamma-ray spectrometer with the HPGe detector. The average activity concentrations of the studied different building and raw materials ranged from 11.6 ± 1.7 (concrete) to 251.2 ± 25.7 Bqkg-1 (GBFS), 14.0 ± 2.7 (concrete) to 54.4 ± 8.3 (coal fly ash) and 147.2 ± 19.0 (concrete) to 773.7 ± 82.0 Bqkg-1 (tuff) for 226Ra, 232Th and 40K, respectively. Radium equivalent activity, activity concentration index, absorbed gamma dose rate indoor due to the external exposure and corresponding annual effective dose were determined to estimate the exposure risk arising due to the use of these building and raw materials.

ASSESSMENT OF NATURALLY OCCURRING RADIONUCLIDES IN MALAYSIA’S BUILDING MATERIALS

2019 ◽  
Vol 186 (4) ◽  
pp. 520-523 ◽  
Author(s):  
Shittu Abdullahi ◽  
Aznan Fazli Ismail ◽  
Supian Samat
Keyword(s):  
Hpge Detector ◽  
Building Materials ◽  
Activity Concentration ◽  
Natural Radionuclides ◽  
Naturally Occurring ◽  
High Purity Germanium ◽  
Activity Concentrations ◽  
Naturally Occurring Radionuclides ◽  
Measured Activity ◽  
Materials Used

Abstract The activity concentrations of 226Ra, 232Th and 40K radionuclides from common building materials used by Malaysian people for construction purposes were studied using High-Purity Germanium (HPGe) detector. The measured activity concentrations of the aforementioned radionuclides range from 10 ± 1 Bq kg−1 (limestone) to 155 ± 61 Bq kg−1 (feldspar), 12 ± 3 Bq kg−1 (limestone) to 274 ± 8 Bq kg−1 (kaolin) and 62 ± 19 Bq kg−1 (limestone) to 1114 ± 20 Bq kg−1 (pottery stone) for 226Ra, 232Th and 40K, respectively. The measured activity concentrations of the natural radionuclides reported herein were found to be in accordance with other previous studies. In general, the activity concentration of the natural radionuclides revealed that all the determined values were below the recommended limit.

scholarly journals Natural radioactivity in the soil of Thoulakhom district in Vientiane province, Laos

2019 ◽  
Vol 2 (4) ◽  
pp. 119-125
Author(s):  
Sonexay Xayheungsy ◽  
Khiem Hong Le
Keyword(s):  
Activity Concentration ◽  
Democratic Republic ◽  
Surface Soil ◽  
Natural Radionuclides ◽  
Soil Samples ◽  
Radiation Hazard ◽  
Gamma Spectrometer ◽  
Mean Values ◽  
Activity Concentrations ◽  
The Mean

Results of the first investigation of the activity concentration of the surface soil samples collected at various locations of Thoulakhom district of Vientiane province of Laos People's Democratic Republic (PDR) are presented in this work. The activity concentration of the natural radionuclides 226Ra, 232Th and 40K in the soil samples were determined by gamma spectrometer using a highenergy resolution semiconductor detector HPGe. The activity concentrations of the natural radionuclides were in the range from 11.28 to 31.46 with the mean of 21.76 Bq.kg-1 for 226Ra, from 7.13 to 44.47 with the mean of 21.85 Bq.kg-1 for 232Th and from 8.96 to 581.52 with the mean of 112.89 Bq.kg-1 for 40K. These mean values of the activity concentration were lower than the average worldwide ones, which were 33, 45 and 420 Bq.kg-1 for 226Ra, 232Th, and 40K, respectively. The results indicate dthat the radiation hazard from natural 226Ra, 232Th, and 40K radionuclides in all investigated soil samples taken from area under investigation in this work was not significant.

Transfer from Soil to Grass and Statistical Analysis of Natural Occurring Radionuclides in Soil from Phosphate Mining and Processing Sites in Maritime Region of Togo.

2021 ◽  
Author(s):  
Eyakifama Hazou ◽  
Benjamin Zorko ◽  
Milohum Mikesokpo Dzagli ◽  
Essolakina Manakrihèa Haliba ◽  
Cebastien Joel Guembou Shouop ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Gamma Ray ◽  
Natural Radionuclides ◽  
Gamma Ray Spectrometry ◽  
Transfer Factors ◽  
Phosphate Mining ◽  
Mining Site ◽  
Average Value ◽  
Activity Concentrations ◽  
Average Activity

Abstract Natural radionuclides activity concentrations of 226Ra, 228Ra, and 40K in soil and grass samples, statistical analysis of these radionuclides and transfer factors (TFs) from soil to the grass were carried out from phosphate mining and processing sites in southern areas of Togo using gamma-ray spectrometry-based High Purity Germanium (HPGe) detector. The average activity concentrations of 226Ra, 228Ra, and 40K were found within the range usually measured worldwide. Statistical analysis was done by investigating the skewness, the kurtosis, and the density distribution of radionuclides in the study areas. Both skewness and kurtosis displayed that the activity concentrations of soil and grass samples in the dischargement waste site (Kpémé) and mining site (Hahotoé) exhibited slightly positively skewed, negatively skewed, leptokurtic, and platykurtic distributions. The TFs for 226Ra, 228Ra, and 40K from dischargement waste soil to grass were evaluated. The average transfer factors of 226Ra, 228Ra, and 40K in the phosphate processing area were found to be 0.16, 0.32, and 8.42, respectively. 226Ra and 228Ra TFs values were found to within the limit of worldwide measure values while that of 40K was to be larger than the values measured in other countries. The average TF value of 8.42 for 40K was 8 times higher than the average value of unity, showing its large intake by vegetables. The high TFs for 40K could be explained by the extensive application of phosphate fertilizers to soils when growing vegetables.

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