Radiation protection and NORM residue management in the ...
Rare earth (RE) processing is an environmental hazardous operation. Processed minerals often contain radioactive elements like thorium which occur together with the precious RE elements due to ...
Thorium - Cancer-Causing Substances - National Cancer ...
Thorium is a naturally occurring radioactive metal that is found in soil, rock, and water. It is formed by the radioactive decay of uranium. Minerals such as monazite, thorite, and thorianite are rich in thorium and may be mined for the metal. Thorium has coloring properties that have made it useful in ceramic glazes.
Uranium and Thorium Geology | Geoscience Australia
Alkaline igneous complexes also contain enrichments in thorium relative to average igneous rocks. Other granitic bodies and pegmatites may also have high thorium. Another important category is thorium-bearing veins and lodes, the most prominent example of which in Australia is the Nolans Bore rare earth element-P-U(-Th-F) deposit in the ...
Uranium and thorium in soils, mineral sands, water and ...
The activities of uranium and thorium measured in the soils and mineral sands from Bisichi ranged from 8.7 kBq kg(-1) to 51 kBq kg(-1) for (238)U and from 16.8 kBq kg(-1) to 98 kBq kg(-1) for (232)Th, respectively. These values were significantly higher than those in the control areas of Jos City and Akure and than the reference values reported ...
Characterization of uranium and thorium containing ...
Radioactive minerals of the gneiss of Sopron Mountains were analysed by micro-PIXE method at the Debrecen scanning nuclear microprobe. Zircon and monazite minerals were identified with detectable amount of U and Th. Qualitative elemental maps and quantitative concentration data were obtained on 20 minerals. U and Th concentrations were between few 100 ppm and 10 wt%. The size of the minerals ...
Thorium | Th (Element) - PubChem
Thorium is found in small amounts in most rocks and soils. Soil commonly contains an average of around 6 parts per million (ppm) of thorium. Thorium occurs in several minerals including thorite (ThSiO 4), thorianite (ThO 2 + UO 2) and monazite. Thorianite is a rare mineral and may contain up to about 12% thorium oxide.
Thorium | Th - PubChem
Thorium is a naturally occurring, radioactive substance. In the environment, thorium exists in combination with other minerals, such as silica. Small amounts of thorium are present in all rocks, soil, water, plants, and animals.Soil contains an average of about 6 parts of thorium per million parts of soil (6 ppm). More than 99% of natural thorium exists in the form of thorium-232.
Glossary of Uranium- and Thorium-Bearing Minerals
minerals was listed as minerals not reported to contain uranium or thorium, but which, on crystal-chemical grounds, might be expected to show the presence of uranium or thorium if investigated by modern methods. The list is not included here; we wish, however, to repeat that these minerals mainly those containing the rare-earth ele-
Radiation Protection and NORM Residue Management in the ...
Description . This Safety Report is a compilation of detailed information on the processes and materials involved in the production of rare earths from thorium-containing minerals and on the radiological considerations that need to be taken into account by the regulatory body when determining the nature and extent of radiation protection measures.
Category:Thorium minerals - Wikipedia
Wikimedia Commons has media related to Thorium minerals. Minerals containing the chemical element thorium. Pages in category "Thorium minerals" The following 19 pages are in this category, out of 19 total. This list may not reflect recent changes . A. ...
Thorium - HPS Chapters
Thorium is also found in the minerals thorite (thorium silicate) and thorianite (mixed thorium and uranium oxides). ... thorium are ingestion of food and water containing thorium and inhalation of thorium-contaminated dust. Ingestion is generally the main exposure concern, unless there is a nearby source of airborne dust containing thorium such ...
mineral deposits thorium
Thorium in Australia – Parliament of Australia. Sep 17 2007· Thorium is found in small quantities in the earth s upper crust where at 6 10 parts per million it is about three times more abundant than uranium The main source of thorium in Australia and worldwide is the mineral monazite which is a reddish brown rare earth phosphate mineral Monazite contains 8 10 per cent thorium
Thorium - an overview | ScienceDirect Topics
Most thorium containing minerals are insoluble in water, have a high specific weight and are e.g., deposited in near-shore sands. Currently, the heavy mineral coastal sand deposits in Brazil and India are the main sources for thorium. Thorium is typically mined as a by-product of rare earth element or titanium mining activities which was ...
(PDF) Characterization of uranium and thorium containing ...
Radioactive minerals of the gneiss of Sopron Mountains were analysed by micro-PIXE method at the Debrecen scanning nuclear microprobe. Zircon and monazite minerals …
Characterization of uranium and thorium containing ...
Characterization of uranium and thorium containing minerals by nuclear microscopy Zso´fia Kerte´sz1 • Enik}o Furu 1 • Aniko´ Angyal1 • A´ gnes Freiler2,3 • Ka´lma´nTo¨ro¨k3 • A´ kos Horva´th2 Received: 11 July 2014/Published online: 26 May 2015
Thorium - Wikipedia
Because of thorium's radioactivity, minerals containing it are often metamict (amorphous), their crystal structure having been damaged by the alpha radiation produced by thorium. An extreme example is ekanite, (Ca,Fe,Pb) 2 (Th,U)Si 8 O 20, which almost never occurs in nonmetamict form due to the thorium it contains.
