Natural radioactivity and their radiological effects for different types of rocks from Egypt

Harb, S.; Abbady, A.; El-Kamel, Abd El-Hadi; Saleh, Imran Issa; El-Mageed, Abdallah Ibrahim Abd

doi:10.1016/j.radphyschem.2011.11.005

Cited by 28 publications

(15 citation statements)

References 11 publications

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“…Therefore, the rock samples are within an acceptable safe limit. The external hazard (Hex) in the rock samples ranged from 0.14 to 0.98 with a mean [23] depends on the locality geological conditions [9] [11] [16]. In general, the results of this study are comparable to the different published studies as listed in this …”

Section: Calculationssupporting

confidence: 80%

Gamma Radiation Measurements of Naturally Occurring Radioactive in Igneous Rocks and Its Radiological Complications

Al-Zahrani¹

2017

WJNST

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The concentrations of natural radioactivity were measured in igneous rock samples collected from Albaha region in the south west of Saudi Arabia. A high purity germanium (HPGe) detector was used for analysis. . The external and internal indices average values were 0.39 and 0.49, respectively. The average results obtained in this study are lower than the average national and world recommended values, therefore, there is no health risk to the populace of the area. This study provides a baseline map of background radioactivity levels in the Saudi environment and will be used as reference information to assess any changes in the level background due to geological processes.

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Section: Calculationssupporting

confidence: 80%

Gamma Radiation Measurements of Naturally Occurring Radioactive in Igneous Rocks and Its Radiological Complications

Al-Zahrani¹

2017

WJNST

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“…Such materials exist at varying levels in different regions worldwide (Almayahi, Tajuddin, & Jaafar, 2012;Dragovi c et al, 2014;Harb, Abbady, El-Kamel, Saleh, & ElMageed, 2012) Primordial isotopes of 226 Ra, 232 Th, and 40 K are the main sources of external radiation on earth; however, their concentrations present significant geographical variations (UNSCEAR, 2000). These radionuclides, along with essential nutrients, may be absorbed from the soil via plant roots and transported to other parts of the plant.…”

Section: Introductionmentioning

confidence: 99%

Distribution of 226Ra, 232Th, and 40K in rice plant components and physico-chemical effects of soil on their transportation to grains

Alsaffar

Jaafar

Kabir

et al. 2015

Journal of Radiation Research and Applied Sciences

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Available online xxxKeywords: Radioactivity Soil RiceTransfer factor Physico-chemical effects a b s t r a c t Radioactivity distribution and transfer factor (TF) in plants are crucial parameters used to assess radioactive contamination in the environment and its risks to humans. In this study, the activities of 226 Ra, 232 Th, and 40 K were successfully measured via gamma-ray spectrometry on rice plant components (root, straw, husk, and grain) and on corresponding soil samples collected from paddy fields in Penang, Malaysia. Soil physicochemical characteristics (pH, citation exchange capacity, electrical conductivity, organic matter, and soil texture) were also analyzed for their estimated effects on soilegrain TF. A major fraction of the total 226 Ra and 232 Th activities measured at 47% and 57%, respectively, were concentrated in the roots, whereas only about 9% and 8% were distributed in the grains, correspondingly. 40 K activity accumulation was about 59% in the straw and 7% in the grains. Rice soilegrain TFs were observed in the ranges of (0.06e0.36) Â 10 À1 for 226 Ra, (0.04e0.14) Â 10 À1 for 232 Th, and (0.74e4.72) Â 10 À1 for 40 K. Results showed that the selected radionuclide distributions in rice are dependent on component type, and their grain concentrations are not linearly related to their soil concentrations. These findings indicated that uptake predominantly depends on soil physico-chemical characteristics.

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“…Radioactivity concentrations in soils and rocks are the main contributors to natural background radiation [ 11 ]. The OGDR average calculated from the concentrations of radioisotopes in the soil of the City of Chihuahua are higher than the world’s average of 60 nGy·h −1 .…”

Section: Resultsmentioning

confidence: 99%

Lifetime Effective Dose Assessment Based on Background Outdoor Gamma Exposure in Chihuahua City, Mexico

Luevano-Gurrola

Perez-Tapia

Pinedo-Alvarez

et al. 2015

IJERPH

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Determining ionizing radiation in a geographic area serves to assess its effects on a population’s health. The aim of this study was to evaluate the spatial distribution of the background environmental outdoor gamma dose rates in Chihuahua City. This study also estimated the annual effective dose and the lifetime cancer risks of the population of this city. To determine the outdoor gamma dose rate in air, the annual effective dose and the lifetime cancer risk, 48 sampling points were randomly selected in Chihuahua City. Outdoor gamma dose rate measurements were carried out by using a Geiger-Müller counter. Outdoor gamma dose rates ranged from 113 to 310 nGy·h−1. At the same sites, 48 soil samples were taken to obtain the activity concentrations of 226Ra, 232Th and 40K and to calculate their terrestrial gamma dose rates. Radioisotope activity concentrations were determined by gamma spectrometry. Calculated gamma dose rates ranged from 56 to 193 nGy·h−1. Results indicated that the lifetime effective dose of the inhabitants of Chihuahua City is on average 19.8 mSv, resulting in a lifetime cancer risk of 0.001. In addition, the mean of the activity concentrations in soil were 52, 73 and 1097 Bq·kg−1, for 226Ra, 232Th and 40K, respectively. From the analysis, the spatial distribution of 232Th, 226Ra and 40K is to the north, to the north-center and to the south of city, respectively. In conclusion, the natural background gamma dose received by the inhabitants of Chihuahua City is high and mainly due to the geological characteristics of the zone. From the radiological point of view, this kind of study allows us to identify the importance of manmade environments, which are often highly variable and difficult to characterize.

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Natural radioactivity and their radiological effects for different types of rocks from Egypt

Cited by 28 publications

References 11 publications

Gamma Radiation Measurements of Naturally Occurring Radioactive in Igneous Rocks and Its Radiological Complications

Gamma Radiation Measurements of Naturally Occurring Radioactive in Igneous Rocks and Its Radiological Complications

Distribution of 226Ra, 232Th, and 40K in rice plant components and physico-chemical effects of soil on their transportation to grains

Lifetime Effective Dose Assessment Based on Background Outdoor Gamma Exposure in Chihuahua City, Mexico

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