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Assessment of Norm Levels and Radiological Hazards from Petroleum Extraction in the onshore Oil Fields, Egypt.

Radiat Prot Dosimetry 2021 Jul 12. Epub 2021 Jul 12.

Physics Department, Faculty of Science, New Valley University, Al-Kharja 72511, Egypt.

Forty-nine different samples (crude oil, surface soil, produced water and sludge) from onshore oil fields in the Western Desert of Egypt were assessed for naturally occurring radioactive material (NORM) levels using HPGe gamma-ray spectrometer. The average activity concentrations of 226Ra, 232Th and 40K were 25 ± 1.3, 26 ± 1. Read More

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ASSESSMENT OF NATURAL RADIOACTIVITY LEVELS AND RADIATION EXPOSURE IN NEW BUILDING MATERIALS IN SPAIN.

Radiat Prot Dosimetry 2021 Jul;194(2-3):178-185

Dpto. Ingeniería Química y Ambiental, ETS-Ingeniería, Univ. Sevilla, C/de los Descubrimientos, s/n, Pabellón Plaza de América, Sevilla 41092, Spain.

Novel building materials were manufactured and analyzed for 226Ra, 232Th and 40K using an HPGe gamma-ray spectrometer. The results show that the highest value of 40K was 4530 Bq per kg which was measured in a sample containing fly ashes from olive stones. The highest values of 226Ra and 232Th activities were 181 and 185 Bq per kg, which were measured in a sample with fly ashes from the co-combustion of coal and coke, respectively. Read More

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The naturally occurring radioactivity of 'scalar energy' pendants and concomitant radiation risk.

PLoS One 2021 1;16(6):e0250528. Epub 2021 Jun 1.

Atomic Energy Licensing Board, Dengkil, Selangor, Malaysia.

Forming part of a study of radiological risk arising from use of radioactive consumer products, investigation is made of pendants containing naturally occurring radioactive material. Based on use of gamma-ray spectrometry and Monte Carlo (MC) simulations, the study investigates commercially available 'scalar energy pendants'. The doses from these have been simulated using MIRD5 mathematical phantoms, evaluation being made of dose conversion factors (DCFs) and organ dose. Read More

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K, Ra, Th, U and Cs relationships and behaviour in sedimentary rocks and sediments of a karstic coastal area (Kaštela Bay, Croatia) and related rocks and sediments' differentiation.

Environ Sci Pollut Res Int 2021 May 13. Epub 2021 May 13.

Ruđer Bošković Institute, Bijenička cesta 54, 10 000, Zagreb, Croatia.

Natural (K, Ra, Th, U) and anthropogenic (Cs) radionuclides in consolidated sedimentary rocks (limestones s.l. and marls) and unconsolidated sediments (stream sediments and soils) of the Kaštela Bay (Adriatic Sea, Croatia) coastal area were studied. Read More

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Activity concentrations of U, Th, Ra Cs and K radionuclides in honey samples from Romania. Lifetime cancer risk estimated.

J Environ Radioact 2021 Aug 30;234:106626. Epub 2021 Apr 30.

National Research and Development Institute for Cryogenics and Isotopic Technologies, 4 Uzinei Street, PO Râureni Box 7, 240050, Rm. Vâlcea, Romania.

Romania is on the first place in Europe with an annual production of honey of 30.9 thousand tons in 2018, while the European Union is on the second place in the world with a total of 283 thousand tons. The most part of the honey production from Romania is exported. Read More

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The Anthropogenic Impact on Indoor Radon Concentrations for Secunda, Mpumalanga Province, South Africa.

Health Phys 2021 Aug;121(2):111-116

Department of Physics, Stellenbosch University, Stellenbosch, South Africa.

Abstract: Secunda is a town built amid the coalfields of the Mpumalanga province of South Africa. Surrounding the town are 11 coal-fired plants (CFPs) contributing around 59% of the country's energy needs. It is also home to Sasol Synfuels, which produces synthetic gas through coal gasification and natural gas reforming. Read More

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DETERMINATION OF NATURAL RADIOACTIVITY AND RADIOLOGICAL HAZARD ASSOCIATED WITH SEDIMENTS SOURCED FROM OGUNPA RIVER CHANNELS, IBADAN, NIGERIA.

Radiat Prot Dosimetry 2021 May;193(3-4):259-263

Department of Physics, Federal University of Technology Akure, Akure, Ondo State, Nigeria.

The natural radionuclides content and radiological assessment of sediments of the Ogunpa waste-water channel were evaluated to ascertain the radiological safety of the sediments as a building material. The mean activity concentrations of 40K, 226Ra and 232Th in Bq kg-1 were found to be 171 ± 69, 11 ± 5 and 10 ± 4, respectively. The overall mean radium equivalent 29 ± 13 Bq kg-1 was <370 Bq kg-1 that can give the maximum recommended dose of 1 mSv to the general public. Read More

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Soil-to-plant transfer factors of U and Th in rice from Ezillo paddy fields, Ebonyi State, Nigeria.

J Environ Radioact 2021 Jul 1;233:106606. Epub 2021 Apr 1.

Department of Physics, Faculty of Physical Sciences, University of Benin, Benin-City, Edo State, Nigeria.

The uptake of radionuclides by plants and their subsequent relocation to the human body through ingestion is one major pathway of human internal exposure. Thus, the present study was conducted to examine the levels of natural radionuclides, U and Th, in soil of Ezillo paddy fields (field 1 and field 2) at depths 0-4 cm and 4-8 cm, their transfer and accumulation in rice grains. The mean concentrations of both radionuclides in the soil were clearly greater than the UNSCEAR estimated worldwide average while that of the rice with values of 11. Read More

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The presence of radioactive heavy minerals in prospecting trenches and concomitant occupational exposure.

PLoS One 2021 31;16(3):e0249329. Epub 2021 Mar 31.

Ural Federal University, Ekaterinburg, Russia.

Uranium, perhaps the most strategically important component of heavy minerals, finds particular significance in the nuclear industry. In prospecting trenches, the radioactivity of 238U and 232Th provides a good signature of the presence of heavy minerals. In the work herein, the activity concentrations of several key primordial radionuclides (238U, 232Th, and 40K) were measured in prospecting trenches (each of the latter being of approximately the same geometry and physical situation). Read More

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Radioactivity of soil in Croatia I: naturally occurring decay chains.

Arh Hig Rada Toksikol 2021 Mar 30;72(1):6-14. Epub 2021 Mar 30.

Institute for Medical Research and Occupational Health, Zagreb, Croatia.

The assessment of environmental radioactivity much relies on radionuclide content in soil. This stems from the significant contribution of soil to both external and internal exposure to ionising radiation via direct emission of gamma radiation and soil-to-plant radionuclide transfer, respectively. This motivated us to carry out a systematic research on the radioactivity of soil in Croatia to obtain relevant data that can be used as a basis for understanding the related effects of geomorphological, biogeographical, and climatological properties of the environment. Read More

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Reduced soil fauna decomposition in a high background radiation area.

PLoS One 2021 17;16(3):e0247793. Epub 2021 Mar 17.

Norwegian Radiation and Nuclear Safety Authority, Østerås, Norway.

Decomposition of litter and organic matter is a very important soil ecosystem function where soil fauna play an important role. Knowledge of the responses in decomposition and soil fauna to different stressors is therefore crucial. However, the extent to which radioactivity may affect soil fauna is not so well known. Read More

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Transport model predictions of Ac production cross sections via energetic p, d and α irradiation of Th targets.

Appl Radiat Isot 2021 Jun 3;172:109676. Epub 2021 Mar 3.

Nuclear and Radiochemistry Group, Isotope and Fuel Cycle Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831-6226, USA.

Monte Carlo transport codes PHITS and MCNP6 were used to calculate the production cross sections of Ac, Th, Ra, and Pa via the bombardment of aTh target with energetic protons, deuterons, and α-particles. The incident projectile energies ranged between 10 and 800 MeV/nucleon. When possible, the predicted production cross sections were compared with the available experimental data and other predictions. Read More

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ASSESSMENT OF THE RADIOACTIVITY OF GAMMA EMITTERS IN BABY FORMULA FOR DIFFERENT AGE GROUPS AND BABY CEREAL CONSUMED IN JORDAN.

Radiat Prot Dosimetry 2021 Jan;193(1):8-15

Physics Department, Yarmouk University, Irbid 21163, Jordan.

In the present work, different brands of baby formula and cereal consumed in Jordan were analyzed for their radioactivity content. The activity concentrations of 40K varied with the designated age group in formula with the average concentrations being (in Bq/kg): 160.2 ± 33. Read More

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January 2021

COMMITTED EFFECTIVE DOSE FROM NATURAL RADIONUCLIDES IN FARM-RAISED AND WILD CATFISH IN IBADAN, NIGERIA.

Radiat Prot Dosimetry 2021 Jan;193(1):1-7

Department of Physics, The Federal University of Technology, PMB 504 Akure, Nigeria.

There is extensive contamination of the aquatic environment when rivers and streams flow through areas of high human activities such as industrial cities and major towns. These contaminations may include enhanced background levels of naturally occurring radioactive materials resulting from rapid urbanization and other human activities. The natural radionuclides (40K, 238U (226Ra) and 232Th (228Ra)) contents of farm-raised and wild catfish in five fish farms and three major rivers within Ibadan metropolis have been studied using gamma spectrometry. Read More

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January 2021

NATURALLY OCCURRING RADIONUCLIDES IN SOIL SAMPLES OF BURETI SUB-COUNTY OF KERICHO COUNTY KENYA.

Radiat Prot Dosimetry 2020 Dec;192(4):491-495

Department of Physics, Kenyatta University, P.O Box 43844-00100, Nairobi, Kenya.

The activity concentration of soil samples of Bureti sub-county was measured using thallium-activated sodium iodide detector. To ascertain the level of radiation hazard to the public, gamma radiation dose rates were also estimated. The average activity concentration due to 40K, 226Ra and 232Th for soil samples are 1164 ± 70, 106 ± 8 and 79 ± 5 Bqkg-1, respectively. Read More

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December 2020

Measurement of Natural Radionuclides and Assessment of Radiation Hazard in Coal from Parts of China.

Health Phys 2021 May;120(5):552-558

Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Centre for Disease Control and Prevention, Beijing 100088, China.

Abstract: To study the content of radionuclides in coal and to assess its associated radiological impact on the environment for potential radiological risk assessment, a total of 40 coal samples were collected from various mining areas in eight provinces of China. The specific activities of 226Ra, 232Th, 40K, 210Pb, and 238U were measured in all samples using an HPGe gamma-ray spectrometer, and results were compared with available data from other similar studies. The results reveal that the radium equivalent activity was 74. Read More

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POTENTIAL ENVIRONMENTAL HAZARD TO THE PUBLIC FROM THE OPERATION OF URANIUM MINING AND MILLING FACILITY.

Radiat Prot Dosimetry 2020 Dec;192(1):75-88

Department of NPP Engineering, KEPCO International Nuclear Graduate School, 658-91 Haemaji-ro, Seosaeng-myeon, Ulju-gun, Ulsan 45014, Republic of Korea.

Mining and milling processes could cause potential radiological exposures to the public. The objective of this study was to estimate the off-site radiological doses expected to be received by the public as a result of uranium mining and milling activities at Mkuju River Project in the United Republic of Tanzania. MILDOS-AREA was used to estimate off-site doses along with RESRAD-OFFSITE for comparison and verification. Read More

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December 2020

A new method to extract Th, Th and Pa from seawater using a bulk-extraction technique with Nobias PA-1 chelating resin.

Talanta 2021 Feb 11;223(Pt 2):121734. Epub 2020 Oct 11.

Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, USA.

The long-lived radioisotopes of Th and Pa are unique tracers for quantifying rates of biogeochemical processes in the ocean. However, their generally low concentrations (sub-fg/kg for Th and Pa and pg/kg for Th) in seawater make them difficult to measure. Here, we present a new approach to determine Th and Th using Nobias PA-1 chelating resin following a bulk-extraction technique, and report for the first time the use of this resin to measure Pa concentrations. Read More

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February 2021

Natural Radioactivity of the Crystalline Basement Rocks of the Peloritani Mountains (North-Eastern Sicily, Italy): Measurements and Radiological Hazard.

Radiat Prot Dosimetry 2020 Nov 18. Epub 2020 Nov 18.

Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra (MIFT), Università di Messina, 98166 Messina, Italy.

Crystalline rocks can produce dangerous radiation levels on the basis of their content in radioisotopes. Here, we report radiological data from 10 metamorphic and igneous rock samples collected from the crystalline basement of the Peloritani Mountains (southern Italy). In order to evaluate the radiological properties of these rocks, the gamma radiation and the radon emanation have been measured. Read More

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November 2020

Study of soil to plant transfer factors of Ra, Th, K and Cs in Vietnamese crops.

J Environ Radioact 2020 Nov 7;223-224:106416. Epub 2020 Sep 7.

Institute of Radiochemistry and Radioecology, University of Pannonia, Veszprem, Hungary. Electronic address:

The study of staple food products is crucial to assure public safety and provides input for predictive dose assessment models. To further this goal, the activity concentrations, transfer factors, and radiological hazards of Ra, Th, K, and Cs were studied for ten pairs of selected vegetables and soils in Tien Le near Hanoi in Vietnam. This is the first study in this area for Vietnamese vegetable samples. Read More

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November 2020

EFFECT OF WORKING CONDITIONS AND NATURAL RADIOACTIVITY LEVELS ON OCCUPATIONAL DOSES TO WORKERS OF AN OLD MANGANESE MINE.

Radiat Prot Dosimetry 2020 Sep;190(3):331-341

Department of Siting and Environment, Egyptian Nuclear and Radiological Regulatory Authority (ENRRA), Nasr City, Cairo 11762, Egypt.

The aim of this work was to use RESRAD-Build model to predict the resulting external and internal radiological doses received by the workers of manganese mine located in Southern Sinai. In order to achieve that goal, measurement of the activity concentrations of natural radionuclides in rock samples collected from the inside gallery of such mine, using hyper pure germanium (HPGe) detector. Radon gas concentrations were also measured. Read More

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September 2020

ESTIMATION OF RADIOLOGICAL HAZARDS DUE TO NATURAL RADIONUCLIDES FROM THE ROSTERMAN GOLD MINE TAILINGS, LURAMBI, KAKAMEGA, KENYA.

Radiat Prot Dosimetry 2020 Sep;190(3):324-330

Department of Physical Sciences, South Eastern Kenya University, P.O BOX 170-90200 Kitui, Kenya.

Radiological hazards associated with naturally occurring radionuclides in materials from Rosterman gold mine were assessed by analysis of 30 samples. The gamma-ray spectrometric analysis of tailing samples reported an average activity concentration of 263 ± 13, 123 ± 6 and 84 ± 4 Bq kg-1 for 40K, 232Th and 226Ra, respectively. The average absorbed dose rate was 124 ± 6 nGy h-1, while the annual effective dose of 0. Read More

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September 2020

Study of Alpha and Beta Radioactivity of Clay Originating from Radionuclides Belonging to the 238U and 232Th Families: Doses to the Skin of Potters.

Health Phys 2021 Feb;120(2):177-190

Nuclear Physics and Techniques Laboratory, Faculty of Sciences Semlalia, BP.2390, University of Cadi Ayyad, Marrakech, Morocco (URAC-15 Research Unit Associated to the CNRST, Rabat, Morocco).

Abstract: Pottery objects are presently more and more used for decoration in homes and hotels. To assess radiological hazards to potters, 238U, 232Th, 222Rn, and 220Rn radionuclides were analyzed in different clay body samples used for pottery production by means of CR-39 and LR-115 II track detectors. Data obtained were compared to those gotten by means of isotope dilution mass spectrometry. Read More

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February 2021

ESTIMATION OF RADIOLOGICAL EXPOSURE LEVELS IN A MINING AREA BASED ON 238U, 226Ra, 232Th and 40K ACTIVITY MEASUREMENTS: A CASE STUDY FOR BEYLIKOVA-SIVRIHISAR COMPLEX ORE SITE IN TURKEY.

Radiat Prot Dosimetry 2020 Sep;190(3):297-306

Bursa Uludağ University, Faculty of Arts and Sciences, Physics Department, Görükle Campus, Bursa 16059, Turkey.

The study estimated the radiological exposure levels in a mining area for miners in the Beylikova-Sivrihisar (Turkey) complex ore site containing 238U, 226Ra and 232Th. Sixty samples were collected from the study area based on a geologic map. The radionuclide activities were measured using a 78. Read More

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September 2020

Accumulation rates of natural radionuclides (K, Pb, Ra, U, and Th) in topsoils due to long-term cultivations of water spinach (Ipomoea Aquatica Forssk.) and rice (Oryza Sativa L.) based on model assessments: A case study in Dong Nai province, Vietnam.

J Environ Manage 2020 Oct 18;271:111001. Epub 2020 Jul 18.

Department of Nuclear Physics and Nuclear Engineering, Faculty of Physics and Engineering Physics, University of Science, Ho Chi Minh City, Viet Nam; Nuclear Technique Laboratory, University of Science, Ho Chi Minh City, Viet Nam; Vietnam National University, Ho Chi Minh City, Viet Nam. Electronic address:

In topsoils, the activity concentrations of natural radionuclides (hereafter NRs) increase due to the addition of NRs from fertilizers, irrigation water, and air dust pollution. On the other hand, various physical-chemical and environmental processes such as radioactive decay, volatilization, leaching, erosion, and plant uptake were responsible for the decrease of the activity concentrations of NRs in the topsoils. In this study, behaviours of K, Pb, Ra, U, and Th in topsoils were modelled by the CEMC soil model and the HYDRUS-1D model. Read More

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October 2020

Measurement of fission cross sections for Th(n,f)XZ84 reaction around the neutron energy of 14 MeV.

Appl Radiat Isot 2020 Oct 3;164:109242. Epub 2020 Jun 3.

School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, China; Engineering Research Center for Neutron Application Technology, Ministry of Education, Lanzhou University, Lanzhou, 730000, China. Electronic address:

Neutron induced fission cross sections of Th(n,f)Se, Th(n,f)Br, Th(n,f)Br reactions were measured based on neutrons from the D-T source. The α-particles emitted from the T(d,n)He reaction were measured to monitor the neutron flux, while the ratio of Zr(n,2n)Zr to Nb(n,2n)Nb reactions was used to determine the neutron energy. The gamma-ray activity of samples was measured with a well calibrated HPGe-γ detector. Read More

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October 2020

Th-Spallation-Produced Ac with Reduced Ac Content.

Inorg Chem 2020 Sep 17;59(17):12156-12165. Epub 2020 Jul 17.

Life Sciences Division, TRIUMF, Vancouver, British Columbia, Canada V6T 2A3.

Recent clinical results have demonstrated remarkable treatment responses of late-stage cancer patients when treated with alpha-emitting radionuclides such as actinium-225 (Ac). The resulting intense global effort to produce greater quantities of Ac has triggered a number of emerging technologies to produce this rare, yet important, radionuclide. Accelerator-based methods for increasing global Ac production capacity have focused on the high energy (>100 MeV) proton irradiation of thorium, despite the coproduction of the undesirable Ac byproduct at 0. Read More

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September 2020

RADIATION SITUATION IN THE TERRITORIES AFFECTED BY MINING ACTIVITIES IN STEPNOGORSK AREAS, REPUBLIC OF KAZAKHSTAN: PILOT STUDY.

Radiat Prot Dosimetry 2020 Jul;189(4):517-526

Ural Research Center for Radiation Medicine, Chelyabinsk 454076, Russia.

The Republic of Kazakhstan has a long history of mining activities, viz., gold and uranium. Mining activities represent sources of potential naturally occurring radionuclides contamination of the environment and human health of population. Read More

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DOSE ASSESSMENT OF NATURAL TERRESTRIAL RADIONUCLIDES IN COMMONLY CONSUMED FOODS IN NORTH INDIA.

Radiat Prot Dosimetry 2020 Jul;189(3):362-370

Environment Monitoring and Assessment Lab, Department of Physics, Dr B R Ambedkar National Institute of Technology, Jalandhar, Punjab, India-144011.

The present study aimed to record natural radionuclide content in branded food samples representative of a typical North Indian diet. Forty samples of various food items falling into three categories namely, cereal grains, pulses and beverages were collected from the local markets of Punjab. The radiometric analysis was performed using NaI(Tl) scintillator detector. Read More

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