Prof. Dr. Shaban Harb - Profile on Academia.edu (original) (raw)
Papers by Prof. Dr. Shaban Harb
On the human radiation exposure as derived from the analysis of natural and man-made radionuclides in soils
Page 1. On the human radiation exposure as derived from the analysis of natural and man-made radi... more Page 1. On the human radiation exposure as derived from the analysis of natural and man-made radionuclides in soils Vom Fachbereich Physik der Universität Hannover zur Erlangung des Grades Doktor der Naturwissenschaften Dr. rer. nat. genehmigte Dissertation von (M.Sc. ...
In the present study, The natural radioactivity in soil, phosphate, and building materials (sand,... more In the present study, The natural radioactivity in soil, phosphate, and building materials (sand, granite, marble, and limestone) were determined by using gamma ray spectrometer NaI (Tl) and MCA 1024. AlphaGUARD was used for radon exhalation rate. The data analyses were performed to determine 226 Ra, 232 Th and 40 K activity concentrations as well as 222 Rn exhalation rate. The radium equivalent activity (Raeq), external hazard index (Hex), absorbed dose rate and annual effective dose were varied from 71.66 to 9048.94 Bqkg -1 , 0.19 to 24.45, 34.48 to 4172.34 nGyh -1 and 0.04 to 5.12 mSvy -1 respectively in all samples. The mass and area exhalation rates were increased from 1.31±0.09 Bqkg -1 h -1 and 23.09±0.33 Bqm -2 h -1 , at 30 0 C, to 7.98±0.56 Bqkg - 1 h -1 and 141.11±1.52 Bqm -2 h -1 , at 60 0 C, respectively, for phosphate samples (grain size<80m). decay progeny) and the primordial radionuclide 40 K. The samples, were air dried at room temperature in open air to ensure th...
IEEE Transactions on Nuclear Science, 2000
Two techniques for longitudinal segmentation of shashlik calorimeters are proposed. Results conce... more Two techniques for longitudinal segmentation of shashlik calorimeters are proposed. Results concerning energy resolution, impact point reconstruction and e / n separation are reported.
Applied Water Science, 2022
Monitoring groundwater quality and analyzing geochemical processes are very crucial in dry enviro... more Monitoring groundwater quality and analyzing geochemical processes are very crucial in dry environments, especially in areas with intense agriculture and inadequate irrigation management systems. A total of forty-one groundwater samples were collected from the study area and analyzed for major ions chemistry. The results of the geochemical analyses are used to investigate the geochemical processes and make groundwater assessments. The hydrogeochemical characteristics of the groundwater samples revealed a highly mineralized Na+–Cl− water type, implying that the majority of the samples are chemically unfit for human consumption. Based on the water quality parameters analyzed for the groundwater samples collected in this study, such as sodium adsorption ratio (SAR), soluble sodium percentage (SSP), residual sodium carbonate (RSC), magnesium hazard (MH), permeability index (PI), and Kelley's ratio (KR), the suitability of groundwater samples for irrigation purposes is good to modera...
Natural radionuclides in groundwater from Qena governorate, Egypt
Environmental Forensics, 2020
AlphaGUARD radon gas analyzer and NaI (Tl) spectrometer were used to measure the concentration le... more AlphaGUARD radon gas analyzer and NaI (Tl) spectrometer were used to measure the concentration levels of 222Rn and, 226Ra, 232Th, and 40K respectively in 109 groundwater samples collected from four different districts in Qena governorate, Egypt. The average values of the activity concentration were 3.57 ± 0.08, 0.54 ± 0.03, 0.40 ± 0.03, and 5.10 ± 0.44 Bql−1 for 222Rn, 226Ra, 232Th, and 40K, respectively. The average values of 222Rn, 226Ra, and 232Th are lower than, 100, 1, and 1 Bql−1, respectively, the WHO recommended permissible levels for drinking water. For radiation exposure assessment, the annual effective doses due to ingestion of 226Ra and 232Th and inhalation of 222Rn for adults were determined and compared with the reference limits. The annual effective doses due to ingestion 139.21–201.34 µSvy−1 are higher than the public annual dose limit 100 µSvy−1 recommended by WHO. These indicate that the ingestion of groundwater from the study areas might pose radiological health h...
World Journal of Nuclear Science and Technology, 2014
The aim of this study is to determine the transfer factor soil-to-plant and to assess the concent... more The aim of this study is to determine the transfer factor soil-to-plant and to assess the concentration level of natural and artificial radionuclide (238 U, 226 Ra, 228 Ra, 232 Th, 40 K and 137 Cs) in samples from Saluga and Ghazal Protectorate area in Aswan, Egypt, by using High Pure Germanium detector (HPGe) Environmental Radioactivity Measurements Labrotary in faculty of science Qena. Reported values for natural radionuclides ranged from 8.81
Measurement of Radium Concentration and Radon Exhalation Rates of Soil Samples Collected from Selected Area of Aden Governorate, Yemen, Using Plastic Track Detectors
International Journal of High Energy Physics
Journal of Radioanalytical and Nuclear Chemistry, 2007
The aim of the present work was to determine the concentration of radionuclides in all kinds of t... more The aim of the present work was to determine the concentration of radionuclides in all kinds of tea available at the local Egyptian market. Radioactivity of the nuclides 238 U, 226 Ra, 210 Pb, 228 Th, 232 Th, 226 Ra, 137 Cs and 40 K were measured in tea by direct -ray spectrometry using HPGe detector and their mean values were 16.0 5.3, 3.1 0.7, 34.3 3.4, 3.4 1.2, 3.0 0.6, 3.1 0.8, 0.9 0.2 and 623 25 Bq . kg -1 , respectively. * S_R_M_H@yahoo.com Present address: Center for Radiation Protection and Radioecology, Hanover University (ZSR), Herrenhaeuser Str. 2, 30419 Hanover, Germany.
Radiation protection dosimetry, 2008
Radionuclides which present in different beach sands are sources of external exposure that contri... more Radionuclides which present in different beach sands are sources of external exposure that contribute to the total radiation exposure of human. In this work, superficial samples of beach sand were collected from the Red Sea coastline (Ras Gharib, Hurghada, Safaga, Qusier and Marsa Alam areas) and at 20 km on Qena-Safaga road. The distribution of natural radionuclides in sand beach samples was studied by gamma spectrometry. The activity concentrations of primordial and artificial radionuclides in samples that are collected from the coastal environment of the Red Sea were 19.2 +/- 3 Bq kg(-1) for (210)Pb, 21.1 +/- 1 Bq kg(-1) for (226)Ra, 22.7 +/- 2 Bq kg(-1) for (238)U, 1.0 +/- 0.1 Bq kg(-1) for (235)U, 11.6 +/- 1 Bq kg(-1) for (228)Ra, 13.0 +/- 1 Bq kg(-1) for (228)Th, 12.4 +/- 1 Bq kg(-1) for (232)Th, 930 +/- 32 Bq kg(-1) for (40)K and 1.2 +/- 0.3 Bq kg(-1) for (137)Cs. The mean external gamma-dose rate was 62.5 +/- 3.2 nSv h(-1), 54.4 +/- 2.8 nGy h(-1) Ra equivalent activity (Ra(e...
The distribution of natural radionuclide γ-ray activities and their respective annual effective d... more The distribution of natural radionuclide γ-ray activities and their respective annual effective dose rates, produced by 40 K, 238 U, 226 Ra, 235 U and 232 Th, were determined for granite samples collected along the road of Idfu -Marsa Alam in eastern desert of Egypt. This subject is important in environmental radiological protection, since granites are widely used as building material. The variation in concentration of radionuclides for thirty granite samples was determined. A HPGe spectrometer was used for quantification of gamma emitting radionuclides in the sediments. All sediments contained radionuclides from the uranium and thorium series as well as 40 K. 238 U concentrations in the samples ranged (from 12.03±0.88 to 19.34±1.41 Bq.kg -1), 235 U (from 1.16±0.11 to 4.83±0.44, Bq.kg -1), 226 Ra (from 9.69±0.82 to 18.97±1.33 Bq.kg -1), 228 Ra ranged (from 10.24±0.70 to 17.35±1.29) 232 Th range (from 9.99±0.67 to l7.65±1.23 Bq.kg -1) and 40 K (from 298.58±21.74 to 955.78±69.58 Bq.kg...
Radon exhalation rate and Radionuclides in soil, phosphate, and building materials
IOSR Journal of Applied Physics
In the present study, The natural radioactivity in soil, phosphate, and building materials (sand,... more In the present study, The natural radioactivity in soil, phosphate, and building materials (sand, granite, marble, and limestone) were determined by using gamma ray spectrometer NaI (Tl) and MCA 1024. AlphaGUARD was used for radon exhalation rate. The data analyses were performed to determine 226Ra, 232Th and 40K activity concentrations as well as 222Rn exhalation rate. The radium equivalent activity (Raeq), external hazard index (Hex), absorbed dose rate and annual effective dose were varied from 71.66 to 9048.94 Bqkg-1, 0.19 to 24.45, 34.48 to 4172.34 nGyh-1 and 0.04 to 5.12 mSvy-1 respectively in all samples. The mass and area exhalation rates were increased from 1.31±0.09 Bqkg-1h-1 and 23.09±0.33 Bqm-2h-1, at 30 0C, to 7.98±0.56 Bqkg-1h-1 and 141.11±1.52 Bqm-2h-1, at 60 0C, respectively, for phosphate samples (grain size<80m).
World Journal of Nuclear Science and Technology, 2014
The aim of this study is to determine the transfer factor soil-to-plant and to assess the concent... more The aim of this study is to determine the transfer factor soil-to-plant and to assess the concentration level of natural and artificial radionuclide ( 238 U, 226 Ra, 228 Ra, 232 Th, 40 K and 137 Cs) in samples from Saluga and Ghazal Protectorate area in Aswan, Egypt, by using High Pure Germanium detector (HPGe) Environmental Radioactivity Measurements Labrotary in faculty of science Qena. Reported values for natural radionuclides ranged from 8.81 ± 0.64 to 28.88 ± 2.10, from 6.98 ± 0.51 to 26.01 ± 1.89, from 12.29 ± 0.89 to 33.32 ± 2.43, from 12.53 ± 0.91 to 32.81 ± 2.39 and from 383.90 ± 27.95 to 711.98 ± 51.83 Bq•kg −1 for 238 U, 226 Ra, 228 Ra, 232 Th and 40 K, respectively. 137 Cs activity concentration was found to be in the range from 0.36 ± 0.03 to 9.73 ± 0.71 Bq•kg −1 and was calculated through transfer factor TF reported in this article.
IOSR Journal of Applied Physics, 2014
The distribution of natural radionuclide γ-ray activities and their respective annual effective d... more The distribution of natural radionuclide γ-ray activities and their respective annual effective dose rates, produced by 238 U, 226 Ra, 228 Ra, 235 U, 232 Th and 40 K were determined for igneous rock samples collected along the road between Idfu and Marsa Alam in eastern desert of Egypt. This subject is important in environmental radiological protection, since igneous rocks are widely used as building material. The variation in concentration of radionuclides for thirty igneous rock samples was determined. A HPGe spectrometer was used for quantification of gamma emitting radionuclides in the samples. All igneous rocks contained radionuclides from the uranium and thorium series as well as 40 K. 238 U concentrations in samples ranged from 12.03±0.88 to 19.34±1.41 Bq.kg -1 , 235 U from 1.16±0.11 to 4.83±0.44, Bq.kg -1 , 226 Ra from 9.69±0.82 to 18.97±1.33 Bq.kg -1 , 228 Ra ranged from 10.24±0.70 to 17.35±1.29, 232 Th range from 9.99±0.67 to l7.65±1.23 Bq.kg -1 and 40 K from 298.58±21.74 to 955.78±69.58 Bq.kg -1 .
IOSR Journal of Applied Physics, 2014
The amounts of radioactivity in the igneous rocks have been investigated; 63 basalt rock samples ... more The amounts of radioactivity in the igneous rocks have been investigated; 63 basalt rock samples were collected from Aden governorate, South of Yemen. The activity concentration of 226 Ra, 232 Th and 40 K were measured using NaI (TI) detector. Along the study area the radium equivalent activities Ra eq in Bq/Kg of samples under investigation were found in the range of 51.60to 809.26Bq/Kg with an average value of 237.01Bq/Kg, this value is below the internationally accepted value of 370 Bq/Kg. To estimate the health effects of this natural radioactive composition, the average values of absorbed gamma dose rate D (55 nGyh -1 ), Indoor and outdoor annual effective dose rates E ied (0.11 mSvy -1 ), and E oed (0.03 mSvy -1 ), External hazard index H ex (0.138) and internal hazard index H in (0.154), and representative level index I γr (0.386) have been calculated and found to be higher than the worldwide average values.
The knowledge on radioactivity content of the various radionuclides in the soil and rocks play an... more The knowledge on radioactivity content of the various radionuclides in the soil and rocks play an important role in health physics. The main aim of this work is to estimate the concentrations of natural radionuclides 226 Ra, 228 Ra, 228 Th, 232 Th and 40 k in soil and phosphate samples and, impact of the El-Sabaea phosphate factory on the human health. This can be investigated via gamma-ray spectroscopy by 2 × 2 inch NaI(Tl) scintillation detector. The range of 226 Ra, 232 Th and 40 k were from 59.7±6.7 to 638.3±31.0, from 9.4±1.4 to 40.6±6.3, from 213.1±9.5 to 798.9±30.6 in Bq/kg respectively.
UNTERSUCHUNGEN ZUR STRAHLENEXPOSITION DURCH NATÜRLICHE RADIONUKLIDE AUS DEM STEINKOHLEBERGBAU IN DER VORFLUT INVESTIGATIONS OF THE RADIATION EXPOSURE CAUSED BY AQUATIC RELEASES OF NATURAL RADIONUCLIDES FROM COALMINING
Summary In underground mine-waters of coal-mines precipitation of barium sulfate can occur with c... more Summary In underground mine-waters of coal-mines precipitation of barium sulfate can occur with co- precipitation of the natural radionuclides 226Ra and 228Ra. Although most of the residue re- mains underground, 226Ra and 228Ra are found in the effluents released into rivers and are transported further on. Based on the Basic Safety Standards the river Lippe was choosen as an example
Journal of Medical Physics, 2012
The level of natural radioactivity in rocks and soil of 32 samples collected from locations at No... more The level of natural radioactivity in rocks and soil of 32 samples collected from locations at North Sana'a in Yemen was measured. Concentrations of radionuclides in rocks and soils samples were determined by gamma-ray spectrometer using high purity germanium (HPGe) detector with specially designed shield. The average radioactivity concentrations of 226 Ra, 232 Th, 40 K were determined and expressed in Bq/kg. The results showed that these radionuclides were present in concentrations of 21.79 ± 3.1, 19.5 ± 2.6 and 399.3 ± 16 Bq/kg, respectively, for rocks. For soil, the corresponding values were 48.2 ± 4.4, 41.7 ± 4.5 and 939.1 ± 36 Bq/kg, respectively. Also, the radiological hazard of the natural radionuclide content, radium equivalent activity, total dose rates, external hazard index and gamma activity concentration index of the (rocks/soils) samples in the area under consideration were calculated. The dose rates at 1 m above the ground from terrestrial sources were 38.39 and 86.89 nGy/h for rocks and surface soil, respectively, which present no significant health hazards to humans.
EVALUATION OF RADIOACTIVE EXPOSURE FROM 137Cs IN CONTAMINATED AREAS OF NORTHERN UKRAINE
Health Physics, 2003
The paper gives averages of 137Cs deposition densities in soils from three areas in Northern Ukra... more The paper gives averages of 137Cs deposition densities in soils from three areas in Northern Ukraine measured 12 to 15 y following the Chernobyl accident: in an area near Narodici (75 km west of the Chernobyl nuclear power plant in the so-called zone II) heavily contaminated by the Chernobyl fall-out and in areas around Korosten and Zhitomir showing contamination levels to be much lower. The three areas exhibited very different 137Cs deposition densities of 2.2 MBq m(-2), 400 kBq m(-2), and 5 kBq m(-2), respectively. During a 1-y observation, measurements of the 137Cs transfer in the food chain to humans and 137Cs whole body contents dependent on the 137Cs daily intake were carried out under realistic conditions of the rural inhabitants who lived in settlements within zone II. Detailed investigations of components of the daily diet showed that the high 137Cs contamination levels found in soils of zone II do not affect in any way low 137Cs concentrations of all important agricultural products harvested and consumed by villagers. With regard to consumption habits of the population of zone II, mushrooms and wild berries were found to contribute more than 95% of the 137Cs daily intake to the 137Cs whole body content of about 12 kBq (with maximum values up to 760 kBq) measured in a group of inhabitants of zone II during a period from July 1998 to July 1999. The median of the annual dose of these inhabitants from external and internal exposures was 1.2 mSv y(-1) with a geometric standard deviation of 2.6. Excluding extreme habits, the geometric mean of the total exposure was 1.0 mSv y(-1) with a geometric standard deviation of 1.3.
On the human radiation exposure as derived from the analysis of natural and man-made radionuclides in soils
Page 1. On the human radiation exposure as derived from the analysis of natural and man-made radi... more Page 1. On the human radiation exposure as derived from the analysis of natural and man-made radionuclides in soils Vom Fachbereich Physik der Universität Hannover zur Erlangung des Grades Doktor der Naturwissenschaften Dr. rer. nat. genehmigte Dissertation von (M.Sc. ...
In the present study, The natural radioactivity in soil, phosphate, and building materials (sand,... more In the present study, The natural radioactivity in soil, phosphate, and building materials (sand, granite, marble, and limestone) were determined by using gamma ray spectrometer NaI (Tl) and MCA 1024. AlphaGUARD was used for radon exhalation rate. The data analyses were performed to determine 226 Ra, 232 Th and 40 K activity concentrations as well as 222 Rn exhalation rate. The radium equivalent activity (Raeq), external hazard index (Hex), absorbed dose rate and annual effective dose were varied from 71.66 to 9048.94 Bqkg -1 , 0.19 to 24.45, 34.48 to 4172.34 nGyh -1 and 0.04 to 5.12 mSvy -1 respectively in all samples. The mass and area exhalation rates were increased from 1.31±0.09 Bqkg -1 h -1 and 23.09±0.33 Bqm -2 h -1 , at 30 0 C, to 7.98±0.56 Bqkg - 1 h -1 and 141.11±1.52 Bqm -2 h -1 , at 60 0 C, respectively, for phosphate samples (grain size<80m). decay progeny) and the primordial radionuclide 40 K. The samples, were air dried at room temperature in open air to ensure th...
IEEE Transactions on Nuclear Science, 2000
Two techniques for longitudinal segmentation of shashlik calorimeters are proposed. Results conce... more Two techniques for longitudinal segmentation of shashlik calorimeters are proposed. Results concerning energy resolution, impact point reconstruction and e / n separation are reported.
Applied Water Science, 2022
Monitoring groundwater quality and analyzing geochemical processes are very crucial in dry enviro... more Monitoring groundwater quality and analyzing geochemical processes are very crucial in dry environments, especially in areas with intense agriculture and inadequate irrigation management systems. A total of forty-one groundwater samples were collected from the study area and analyzed for major ions chemistry. The results of the geochemical analyses are used to investigate the geochemical processes and make groundwater assessments. The hydrogeochemical characteristics of the groundwater samples revealed a highly mineralized Na+–Cl− water type, implying that the majority of the samples are chemically unfit for human consumption. Based on the water quality parameters analyzed for the groundwater samples collected in this study, such as sodium adsorption ratio (SAR), soluble sodium percentage (SSP), residual sodium carbonate (RSC), magnesium hazard (MH), permeability index (PI), and Kelley's ratio (KR), the suitability of groundwater samples for irrigation purposes is good to modera...
Natural radionuclides in groundwater from Qena governorate, Egypt
Environmental Forensics, 2020
AlphaGUARD radon gas analyzer and NaI (Tl) spectrometer were used to measure the concentration le... more AlphaGUARD radon gas analyzer and NaI (Tl) spectrometer were used to measure the concentration levels of 222Rn and, 226Ra, 232Th, and 40K respectively in 109 groundwater samples collected from four different districts in Qena governorate, Egypt. The average values of the activity concentration were 3.57 ± 0.08, 0.54 ± 0.03, 0.40 ± 0.03, and 5.10 ± 0.44 Bql−1 for 222Rn, 226Ra, 232Th, and 40K, respectively. The average values of 222Rn, 226Ra, and 232Th are lower than, 100, 1, and 1 Bql−1, respectively, the WHO recommended permissible levels for drinking water. For radiation exposure assessment, the annual effective doses due to ingestion of 226Ra and 232Th and inhalation of 222Rn for adults were determined and compared with the reference limits. The annual effective doses due to ingestion 139.21–201.34 µSvy−1 are higher than the public annual dose limit 100 µSvy−1 recommended by WHO. These indicate that the ingestion of groundwater from the study areas might pose radiological health h...
World Journal of Nuclear Science and Technology, 2014
The aim of this study is to determine the transfer factor soil-to-plant and to assess the concent... more The aim of this study is to determine the transfer factor soil-to-plant and to assess the concentration level of natural and artificial radionuclide (238 U, 226 Ra, 228 Ra, 232 Th, 40 K and 137 Cs) in samples from Saluga and Ghazal Protectorate area in Aswan, Egypt, by using High Pure Germanium detector (HPGe) Environmental Radioactivity Measurements Labrotary in faculty of science Qena. Reported values for natural radionuclides ranged from 8.81
Measurement of Radium Concentration and Radon Exhalation Rates of Soil Samples Collected from Selected Area of Aden Governorate, Yemen, Using Plastic Track Detectors
International Journal of High Energy Physics
Journal of Radioanalytical and Nuclear Chemistry, 2007
The aim of the present work was to determine the concentration of radionuclides in all kinds of t... more The aim of the present work was to determine the concentration of radionuclides in all kinds of tea available at the local Egyptian market. Radioactivity of the nuclides 238 U, 226 Ra, 210 Pb, 228 Th, 232 Th, 226 Ra, 137 Cs and 40 K were measured in tea by direct -ray spectrometry using HPGe detector and their mean values were 16.0 5.3, 3.1 0.7, 34.3 3.4, 3.4 1.2, 3.0 0.6, 3.1 0.8, 0.9 0.2 and 623 25 Bq . kg -1 , respectively. * S_R_M_H@yahoo.com Present address: Center for Radiation Protection and Radioecology, Hanover University (ZSR), Herrenhaeuser Str. 2, 30419 Hanover, Germany.
Radiation protection dosimetry, 2008
Radionuclides which present in different beach sands are sources of external exposure that contri... more Radionuclides which present in different beach sands are sources of external exposure that contribute to the total radiation exposure of human. In this work, superficial samples of beach sand were collected from the Red Sea coastline (Ras Gharib, Hurghada, Safaga, Qusier and Marsa Alam areas) and at 20 km on Qena-Safaga road. The distribution of natural radionuclides in sand beach samples was studied by gamma spectrometry. The activity concentrations of primordial and artificial radionuclides in samples that are collected from the coastal environment of the Red Sea were 19.2 +/- 3 Bq kg(-1) for (210)Pb, 21.1 +/- 1 Bq kg(-1) for (226)Ra, 22.7 +/- 2 Bq kg(-1) for (238)U, 1.0 +/- 0.1 Bq kg(-1) for (235)U, 11.6 +/- 1 Bq kg(-1) for (228)Ra, 13.0 +/- 1 Bq kg(-1) for (228)Th, 12.4 +/- 1 Bq kg(-1) for (232)Th, 930 +/- 32 Bq kg(-1) for (40)K and 1.2 +/- 0.3 Bq kg(-1) for (137)Cs. The mean external gamma-dose rate was 62.5 +/- 3.2 nSv h(-1), 54.4 +/- 2.8 nGy h(-1) Ra equivalent activity (Ra(e...
The distribution of natural radionuclide γ-ray activities and their respective annual effective d... more The distribution of natural radionuclide γ-ray activities and their respective annual effective dose rates, produced by 40 K, 238 U, 226 Ra, 235 U and 232 Th, were determined for granite samples collected along the road of Idfu -Marsa Alam in eastern desert of Egypt. This subject is important in environmental radiological protection, since granites are widely used as building material. The variation in concentration of radionuclides for thirty granite samples was determined. A HPGe spectrometer was used for quantification of gamma emitting radionuclides in the sediments. All sediments contained radionuclides from the uranium and thorium series as well as 40 K. 238 U concentrations in the samples ranged (from 12.03±0.88 to 19.34±1.41 Bq.kg -1), 235 U (from 1.16±0.11 to 4.83±0.44, Bq.kg -1), 226 Ra (from 9.69±0.82 to 18.97±1.33 Bq.kg -1), 228 Ra ranged (from 10.24±0.70 to 17.35±1.29) 232 Th range (from 9.99±0.67 to l7.65±1.23 Bq.kg -1) and 40 K (from 298.58±21.74 to 955.78±69.58 Bq.kg...
Radon exhalation rate and Radionuclides in soil, phosphate, and building materials
IOSR Journal of Applied Physics
In the present study, The natural radioactivity in soil, phosphate, and building materials (sand,... more In the present study, The natural radioactivity in soil, phosphate, and building materials (sand, granite, marble, and limestone) were determined by using gamma ray spectrometer NaI (Tl) and MCA 1024. AlphaGUARD was used for radon exhalation rate. The data analyses were performed to determine 226Ra, 232Th and 40K activity concentrations as well as 222Rn exhalation rate. The radium equivalent activity (Raeq), external hazard index (Hex), absorbed dose rate and annual effective dose were varied from 71.66 to 9048.94 Bqkg-1, 0.19 to 24.45, 34.48 to 4172.34 nGyh-1 and 0.04 to 5.12 mSvy-1 respectively in all samples. The mass and area exhalation rates were increased from 1.31±0.09 Bqkg-1h-1 and 23.09±0.33 Bqm-2h-1, at 30 0C, to 7.98±0.56 Bqkg-1h-1 and 141.11±1.52 Bqm-2h-1, at 60 0C, respectively, for phosphate samples (grain size<80m).
World Journal of Nuclear Science and Technology, 2014
The aim of this study is to determine the transfer factor soil-to-plant and to assess the concent... more The aim of this study is to determine the transfer factor soil-to-plant and to assess the concentration level of natural and artificial radionuclide ( 238 U, 226 Ra, 228 Ra, 232 Th, 40 K and 137 Cs) in samples from Saluga and Ghazal Protectorate area in Aswan, Egypt, by using High Pure Germanium detector (HPGe) Environmental Radioactivity Measurements Labrotary in faculty of science Qena. Reported values for natural radionuclides ranged from 8.81 ± 0.64 to 28.88 ± 2.10, from 6.98 ± 0.51 to 26.01 ± 1.89, from 12.29 ± 0.89 to 33.32 ± 2.43, from 12.53 ± 0.91 to 32.81 ± 2.39 and from 383.90 ± 27.95 to 711.98 ± 51.83 Bq•kg −1 for 238 U, 226 Ra, 228 Ra, 232 Th and 40 K, respectively. 137 Cs activity concentration was found to be in the range from 0.36 ± 0.03 to 9.73 ± 0.71 Bq•kg −1 and was calculated through transfer factor TF reported in this article.
IOSR Journal of Applied Physics, 2014
The distribution of natural radionuclide γ-ray activities and their respective annual effective d... more The distribution of natural radionuclide γ-ray activities and their respective annual effective dose rates, produced by 238 U, 226 Ra, 228 Ra, 235 U, 232 Th and 40 K were determined for igneous rock samples collected along the road between Idfu and Marsa Alam in eastern desert of Egypt. This subject is important in environmental radiological protection, since igneous rocks are widely used as building material. The variation in concentration of radionuclides for thirty igneous rock samples was determined. A HPGe spectrometer was used for quantification of gamma emitting radionuclides in the samples. All igneous rocks contained radionuclides from the uranium and thorium series as well as 40 K. 238 U concentrations in samples ranged from 12.03±0.88 to 19.34±1.41 Bq.kg -1 , 235 U from 1.16±0.11 to 4.83±0.44, Bq.kg -1 , 226 Ra from 9.69±0.82 to 18.97±1.33 Bq.kg -1 , 228 Ra ranged from 10.24±0.70 to 17.35±1.29, 232 Th range from 9.99±0.67 to l7.65±1.23 Bq.kg -1 and 40 K from 298.58±21.74 to 955.78±69.58 Bq.kg -1 .
IOSR Journal of Applied Physics, 2014
The amounts of radioactivity in the igneous rocks have been investigated; 63 basalt rock samples ... more The amounts of radioactivity in the igneous rocks have been investigated; 63 basalt rock samples were collected from Aden governorate, South of Yemen. The activity concentration of 226 Ra, 232 Th and 40 K were measured using NaI (TI) detector. Along the study area the radium equivalent activities Ra eq in Bq/Kg of samples under investigation were found in the range of 51.60to 809.26Bq/Kg with an average value of 237.01Bq/Kg, this value is below the internationally accepted value of 370 Bq/Kg. To estimate the health effects of this natural radioactive composition, the average values of absorbed gamma dose rate D (55 nGyh -1 ), Indoor and outdoor annual effective dose rates E ied (0.11 mSvy -1 ), and E oed (0.03 mSvy -1 ), External hazard index H ex (0.138) and internal hazard index H in (0.154), and representative level index I γr (0.386) have been calculated and found to be higher than the worldwide average values.
The knowledge on radioactivity content of the various radionuclides in the soil and rocks play an... more The knowledge on radioactivity content of the various radionuclides in the soil and rocks play an important role in health physics. The main aim of this work is to estimate the concentrations of natural radionuclides 226 Ra, 228 Ra, 228 Th, 232 Th and 40 k in soil and phosphate samples and, impact of the El-Sabaea phosphate factory on the human health. This can be investigated via gamma-ray spectroscopy by 2 × 2 inch NaI(Tl) scintillation detector. The range of 226 Ra, 232 Th and 40 k were from 59.7±6.7 to 638.3±31.0, from 9.4±1.4 to 40.6±6.3, from 213.1±9.5 to 798.9±30.6 in Bq/kg respectively.
UNTERSUCHUNGEN ZUR STRAHLENEXPOSITION DURCH NATÜRLICHE RADIONUKLIDE AUS DEM STEINKOHLEBERGBAU IN DER VORFLUT INVESTIGATIONS OF THE RADIATION EXPOSURE CAUSED BY AQUATIC RELEASES OF NATURAL RADIONUCLIDES FROM COALMINING
Summary In underground mine-waters of coal-mines precipitation of barium sulfate can occur with c... more Summary In underground mine-waters of coal-mines precipitation of barium sulfate can occur with co- precipitation of the natural radionuclides 226Ra and 228Ra. Although most of the residue re- mains underground, 226Ra and 228Ra are found in the effluents released into rivers and are transported further on. Based on the Basic Safety Standards the river Lippe was choosen as an example
Journal of Medical Physics, 2012
The level of natural radioactivity in rocks and soil of 32 samples collected from locations at No... more The level of natural radioactivity in rocks and soil of 32 samples collected from locations at North Sana'a in Yemen was measured. Concentrations of radionuclides in rocks and soils samples were determined by gamma-ray spectrometer using high purity germanium (HPGe) detector with specially designed shield. The average radioactivity concentrations of 226 Ra, 232 Th, 40 K were determined and expressed in Bq/kg. The results showed that these radionuclides were present in concentrations of 21.79 ± 3.1, 19.5 ± 2.6 and 399.3 ± 16 Bq/kg, respectively, for rocks. For soil, the corresponding values were 48.2 ± 4.4, 41.7 ± 4.5 and 939.1 ± 36 Bq/kg, respectively. Also, the radiological hazard of the natural radionuclide content, radium equivalent activity, total dose rates, external hazard index and gamma activity concentration index of the (rocks/soils) samples in the area under consideration were calculated. The dose rates at 1 m above the ground from terrestrial sources were 38.39 and 86.89 nGy/h for rocks and surface soil, respectively, which present no significant health hazards to humans.
EVALUATION OF RADIOACTIVE EXPOSURE FROM 137Cs IN CONTAMINATED AREAS OF NORTHERN UKRAINE
Health Physics, 2003
The paper gives averages of 137Cs deposition densities in soils from three areas in Northern Ukra... more The paper gives averages of 137Cs deposition densities in soils from three areas in Northern Ukraine measured 12 to 15 y following the Chernobyl accident: in an area near Narodici (75 km west of the Chernobyl nuclear power plant in the so-called zone II) heavily contaminated by the Chernobyl fall-out and in areas around Korosten and Zhitomir showing contamination levels to be much lower. The three areas exhibited very different 137Cs deposition densities of 2.2 MBq m(-2), 400 kBq m(-2), and 5 kBq m(-2), respectively. During a 1-y observation, measurements of the 137Cs transfer in the food chain to humans and 137Cs whole body contents dependent on the 137Cs daily intake were carried out under realistic conditions of the rural inhabitants who lived in settlements within zone II. Detailed investigations of components of the daily diet showed that the high 137Cs contamination levels found in soils of zone II do not affect in any way low 137Cs concentrations of all important agricultural products harvested and consumed by villagers. With regard to consumption habits of the population of zone II, mushrooms and wild berries were found to contribute more than 95% of the 137Cs daily intake to the 137Cs whole body content of about 12 kBq (with maximum values up to 760 kBq) measured in a group of inhabitants of zone II during a period from July 1998 to July 1999. The median of the annual dose of these inhabitants from external and internal exposures was 1.2 mSv y(-1) with a geometric standard deviation of 2.6. Excluding extreme habits, the geometric mean of the total exposure was 1.0 mSv y(-1) with a geometric standard deviation of 1.3.