Related Papers
Health Risks Associated with Radionuclides in Soil Materials
2018 •
Dinesh Benbi
Radionulides in soils from natural and man-made sources constitute a direct route of exposure to humans. The most significant part of the total exposure is due to natural radiation. Soil- or rock-borne radionuclides generate a significant component of the background radiation people are exposed to. Naturally occurring radionuclides with half-lives comparable with the age of the earth and their corresponding decay products existing in terrestrial material, such as thorium (232Th), uranium (238U, 235U) and potassium (40K), are of great importance. Their spatial distribution depends on geological parent materials and plays an important role for radiation protection. Another source of exposure to natural radiation is expressed through high energy cosmic ray particles in earth’s atmosphere. Additional amounts of natural radionuclides are released into the environment through human activities such as mining and milling of mineral ores, processing and enrichment, nuclear fuel fabrications,...
Journal of Environmental Radioactivity
Impact of Saharan dust events on radionuclides in the atmosphere, seawater, and sediments of the northwest Mediterranean Sea
2020 •
pavel povinec
International Scientific Committee
Ramon Balius
Applications of anthropogenic radionuclides as tracers to investigate marine environmental processes
2011 •
G.-h. Hong, Mark Baskaran
Science of The Total Environment
Anthropogenic and natural radionuclides in caribou and muskoxen in the Western Alaskan Arctic and marine fish in the Aleutian Islands in the first half of 2000s
2011 •
Gi Hoon Hong
Journal of Environmental Radioactivity
Impact of Saharan dust events on radionuclide levels in Monaco air and in the water column of the northwest Mediterranean Sea
2017 •
pavel povinec
Role of Fungi in the Determination of the Radiological Status of Terrestrial Ecosystems
Global Science Books
In an attempt to assess the importance of the role of fungi as bioindicators in terrestrial ecosystems, we compiled the results reported by more than 100 authors worldwide. These mostly were centred on the 137 Cs and 40 K contents. The genera Paxillus, Xerocomus, Cantha-rellus, and Hebeloma were among those with the highest radiocaesium contents. Studies in countries not highly contaminated in the Chernobyl accident, which included other anthropogenic and natural radionuclides in the assays find the order of relative accumulation to be: 40 K 137 Cs > 228,230,232 Th § 234,238 U § 226 Ra § 90 Sr >> 239+240 Pu > 241 Am. Laboratory studies showed that the relative position of anthropogenic radionuclides (mainly radiocaesium and radiostrontium) depends on the moment at which fallout occurred. In particular, if the radionuclide deposition occurred long before the formation of the fruiting bodies, the accumulation of radiocaesium was higher than that of radiostrontium. Other factors, such as the concentration of stable elements and the bioavailability of the different radionuclides in the soil, also affect the radioactive content of the fruiting bodies and hence the dose due to their consumption. While the dose from inges-tion of mushrooms in areas clearly affected by the Chernobyl Nuclear Power Plant accident is currently estimated at 1.8 mSv/year due to 137 Cs, the maximum dose in unaffected areas estimated on the basis of the present findings is 4.60·10-3 mSv/year for the main natural and anthropogenic radionuclides present in the environment.
Radioactivity exploration from the Arctic to the Antarctic. Part 3. The SWEDARP expedition Oct 1988 – April 1989
2015 •
Bertil R Persson
The Swedish Antarctic Research Expedition named “SWEDARP” was performed during October 1988 through April 1989. The aim of our project was to study the radioactivity in air and water from Gothenburg to the Antarctic. Between Gothenburg and the Equator, the average activity concentration of 7Be in air was 4.3 ± 0.7 mBq/m3. The activity concentration of 7Be in the South Atlantic down to Antarctica varied between 1.3 and 1.7 with an average of 1.5 ± 0.8 mBq/m3. The average activity concentration of 210Pb in air during autumn 1988 on the route Gothenburg- Montevideo was about 290±270 micro-Bq/m3 and on the return in spring 1989 it was about 230±140 micro-Bq/m3. At the Equator, the average activity concentration of 210Pb in November 1988 was about 630±170 and in April 1989 about 260±210 microBq/m3. In the South Atlantic down to Antarctica during February-March 1989, the activity concentration of 210Pb varied between 11 and 58 micro-Bq/m3. The average activity concentration of 210Po in ai...
Radioactivity Exploration from the Arctic to the Antarctic. Part 2. Ymer-80 Expedition
2015 •
Bertil R Persson
Levels of natural radioactivity such as 222Rn (radon) and its long-lived daughters 210Pb and 210Po were measured. The radon gas was trapped on cooled charcoal filters and the long-lived daughter products sampled on fibre filters on a daily basis. In addition, short-lived progenies were followed continuously on the filters in order to achieve a time resolution of about one hour. The average 222Rn concentration in air measured during the Ymer-80 expedition in samples north of latitude 78.8 °N, was 33 ± 4 (one standard error) mBq.m-3 during Leg 1 (July-Aug.) , and 105.3 ± 8.3 mBq.m-3 during leg 2 (Aug-Sept.). During a two-week period of persistent polar winds, the mean radon concentration decreased to 19± 5 mBq.m-3. During July, August and September, the monthly average concentrations of 210Pb in air at positions north of 75 °N latitude were 31 ± 15, 89 ± 61 and 105± 57 μBq.m-3 respectively with a the grand average for all 3 months of 75 ± 28 μBq.m-3. An extensive radiochemistry progra...
AMAP Assessment 2009: Radioactivity in the Arctic
H. Joensen
