Estimation of Radiation Hazards of Natural Radionuclides in Archaeological Site (Tanis), Egypt

2019 ◽  
Vol 0 (0) ◽  
pp. 0-0
Author(s):  
Safwat Salama ◽  
nassif mansour ◽  
Nabil Hassan
Keyword(s):  
Natural Radionuclides ◽  
Archaeological Site ◽  
Radiation Hazards

scholarly journals Assessment of Natural Radioactivity and radiation hazards in beach sand samples from Kanyakumari District, TamilNadu

2016 ◽  
Vol 3 (3) ◽  
Author(s):  
Ajithra A K ◽  
Shanthi G.
Keyword(s):  
Natural Radioactivity ◽  
Natural Radionuclides ◽  
Absorbed Dose ◽  
Coaxial Cylinder ◽  
Beach Sand ◽  
Coastal Environments ◽  
Radiation Hazards ◽  
United Nations Scientific Committee ◽  
Dose Rates

<div><p><em>Natural radionuclides of terrestrial origin have very long half – lives or driven from very long – lived parent radionuclides, which have been created in stellar processes before the earth formation. The study of natural radioactivity in marine and coastal environments is of significant importance for better understanding of oceanographic and sedimentological processes. The sampling sites are selected to cover randomly to cover the southern part. The soil samples have been collected in beach sides. In situ gamma measurements were conducted using a high-purity germanium (HPGe) detector (coaxial cylinder of 50.1 mm in diameter and 44 mm in length) with a relative efficiency of 50% and an energy resolution (FWHM) of 1.8 keV at the 1.33 MeV reference transition of <sup>60</sup>Co. The measurements shows that the values of the absorbed dose rates in air in the investigated area are lower than the recommended limit by the United Nations Scientific Committee on the Effect of Atomic Radiation.</em></p></div>

scholarly journals Can the incineration of Municipal Solid Waste pose occupational and environmental radiation hazards?

2017 ◽  
Vol 1 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Fernando P. Carvalho
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Natural Radionuclides ◽  
Radiation Detectors ◽  
Environmental Radiation ◽  
Radiation Hazards ◽  
Radiation Background ◽  
Model Calculations ◽  
Safety Standards ◽  
Radioactive Sources

An evaluation of the incineration process of municipal solid waste is made for identifying potential radiation hazards. Sources of radiation considered are the radioactive materials wrongly eliminated into municipal waste (e.g., industrial and medical waste containing radioactive sources, such as cesium-137 and technetium-99m) and also radionuclides of natural origin (e.g., radium-226, polonium-210) contained in common materials disposed as domestic waste. Through burning, radionuclides from both origins may be released as gases and radioactive particles into the atmosphere and build up in the facility and in the environment nearby. Results from model calculations indicated that naturally-occurring radionuclides released into the atmosphere likely originate a small enhancement to the natural radiation background. However, in the case of man-made radioactive sources mixed with the municipal solid waste the radioactive emissions may attain and eventually exceed the radiation dose limit for members of the public. These results support the recommendation that for natural radionuclides present in incinerated waste a careful evaluation of the risk of exposure to ionizing radiation, actually in accord to the European Directive 2013/59/EURATOM establishing the basic safety standards for radiation protection, must be performed and model calculations validated with radioactivity measurements. Regarding the potential release of radionuclides from man-made radioactive sources it is recommended the installation of portals equipped with radiation detectors to check municipal solid waste on admission in the facilities and prevent such radiological accident.

NATURAL RADIOACTIVITY AND EVALUATION OF RADIATION HAZARDS IN SOILS FROM GRANITOIDE-GRANITE GEOLOGICAL FORMATION IN CUBA

2018 ◽  
Vol 184 (1) ◽  
pp. 5-11
Author(s):  
C M Alonso-Hernández ◽  
A L Toledo-Sibello ◽  
A Guillén-Arruebarrena ◽  
R Sibello-Hernández ◽  
Y Morera-Gómez ◽  
...  
Keyword(s):  
Dose Rate ◽  
Natural Radioactivity ◽  
Background Radiation ◽  
Natural Radionuclides ◽  
Hazard Index ◽  
Absorbed Dose ◽  
Absorbed Dose Rate ◽  
Radium Equivalent Activity ◽  
Radiation Hazards ◽  
External Hazard Index

Abstract The natural radioactivity and the associated radiation hazards of soils from the Cumanayagua Granitoide-Granitic massif in the central south of Cuba have been studied. Mass activities of the natural radionuclides 238U, 232Th and 40K varied in the ranges 10.4–33, 4.6–21.7 and 381–1201 Bq kg−1, respectively. The radium equivalent activity (91.4 ± 22.1 Bq kg−1), absorbed dose rate (45.6 ± 11.1 nGy h−1), annual effective dose rate (56.1 ± 13.7 μSv y−1) and the external hazard index (0.25 ± 0.06) have been calculated and compared with the internationally approved values. According to these results, the area can be regarded as an area with normal natural background radiation and may not pose radiological risks to the inhabitants owing to harmful effects of ionizing radiation from the natural radionuclides in soils. This study provides background radioactivity concentrations in Cumanayagua Granitoide area and generate a baseline data for radiological mapping of Cuba in the future.

scholarly journals SOURCES OF RADIOACTIVE WASTE IN LEACH PLANTS PROCESSING URANIUM ORES

2016 ◽  
Vol 11 (5) ◽  
pp. 21-25
Author(s):  
R. Kuzin ◽  
S. N. Brykin ◽  
T. Tairov
Keyword(s):  
Radioactive Waste ◽  
Fuel Cycle ◽  
Natural Radionuclides ◽  
Radioactive Decay ◽  
Processing Waste ◽  
Radiation Hazards ◽  
The People ◽  
Gaseous Waste ◽  
Solid Liquid ◽  
Low Activity

A distinctive feature of enterprises for extracting and processing uranium ore is the inevitable pollution by solid, liquid and gaseous waste. The amount of radioactive waste (RW) is most significant in the nuclear fuel cycle. In spite of its relatively low activity it is the major contributor to the formation of radiation hazards to the people and environment. The radioactivity of uranium ores and of their processing waste is due to natural radionuclides of uranium (238U and 235U) and thorium (232Th) radioactive decay chains.

scholarly journals Assessment of natural radioactivity and radiation hazards of building materials in Kinondoni District, Dar es Salaam, Tanzania

2021 ◽  
Vol 47 (2) ◽  
pp. 664-673
Author(s):  
Huruma P Mammba ◽  
Vitus A Balobegwa ◽  
Alex P Muhulo ◽  
Peter A Pantaleo ◽  
Remigius A Kawala
Keyword(s):  
Building Materials ◽  
Activity Concentration ◽  
Natural Radionuclides ◽  
Hazard Index ◽  
Gamma Activity ◽  
Gamma Ray Spectrometry ◽  
Radium Equivalent Activity ◽  
Radiation Hazards ◽  
Activity Concentrations ◽  
The World

Natural radionuclides from building materials are one of the potential sources of external as well as internal radiation exposure to the human body. Currently, this exposure has been increasing since people spend more than 80% of their time indoors (ICRP 1991). Commonly used building materials from Kinondoni District were investigated using γ-spectrometry; their activity concentrations of 226Ra, 232Th and 40K in Bq/kg were measured. The results showed that average values of activity concentrations of 226Ra, 232Th and 40K were 15.62, 21.51 and 237.99 Bq/kg, respectively. All the activity concentrations in the studied samples were lower than the world average values of 35 Bq/kg for 226Ra, 30 Bq/kg for 232Th and 400 Bq/kg for 40K. The radium equivalent activity ( 𝑅𝑎𝑒𝑞), external ( 𝐻𝑒𝑥), internal hazard index ( 𝐻𝑖𝑛) and gamma activity concentration index (𝐼𝛾) were calculated to assess the radiological hazards due to presence of natural radionuclides in the building materials. The results showed that the average values of Raeq, Hex, and Iγ were 64.7 Bq/kg, 0.17, 0.21 and 0.24, respectively. These values were lower than the world criteria values 370 for Raeq, ≤ 1 for Hex, ≤ 1 for Hin and ≤ 1 for Iγ, respectively. The obtained results indicated that all the investigated building materials were safe for inhabitants. Keywords: Building materials, Natural radionuclides, Radiation hazards, Gamma ray spectrometry, Activity concentration

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