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Rn) was a confounder and that exposure was unrelated to thorium; this isotope is a decay product of . 232. Th (ATSDR 1990) and is an anticipated thorium-related analyte in breath samples. Stehney (1999) assessed the thorium distribution in autopsy samples from 4 of the mill workers, estimated that committed doses from thorium exposure to the
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An epidemiological study showed that the lung cancer mortality of the dust-exposed miners was significantly higher (p 2 and SiO 2 ) and thoron progeny, the first evidence in humans of the carcinogenicity after long-term inhalation of thorium-containing dusts and thoran progeny. A twenty-year follow-up study was carried out at Baiyun Obo Rare-earth Iron …
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Acute exposure: an exposure to radiation that occurred in a matter of minutes rather than in longer, continuing exposure over a period of time. ... Thorium (Th): a naturally occurring radioactive metal found in small amounts in soil, rocks, water, plants, and animals.
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The in-mask concentration of respirable thorium particulate in the welder's breathing zone was 0.002 x 10 (-12) microCi 232Th/mL. The concentration of respirable thorium particulate from electrode sharpening was 1.3 x 10 (-12) microCi 232Th/mL. The measured sharpening time was 20 sec per electrode. Estimates of the activity median aerodynamic ...
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Thorium is generally a health hazard only if it is taken into the body. External gamma exposure is not a major concern because thorium emits only a small amount of gamma radiation. Although thorium-229 has a much higher gamma component than either thorium-232 or thorium-230, thorium-229 comprises a very small fraction of natural thorium.
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Abstract. Two hundred seventy-three men exposed to thorium and other rare earths between 1940 and 1973 at a plant which refined monazite sand were studied at Argonne National Laboratory from 1976 to 1980. In vivo measurements of body burden were made by counting gamma rays emitted by daughter products of retained thorium and by …
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Dec 01, 2016· Exposure to radionuclide thorium (Th) has generated widespread public concerns, mainly because of its radiological effects on human health. Activity levels of airborne 232 Th in total suspended particulate (TSP) were measured in the vicinity of the largest rare earth mine in China in August 2012 and March 2013. The mean activity …
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Abstract. To investigate the theoretic possibility of excessive exposure to thorium during the process of tungsten inert gas (TIG) welding using thoriated rods we carried out a cross-sectional study of TIG welders and an age- and skill-matched group. We measured the radiation doses from inhaled thorium that was retained in the body and ...
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* Exposure can reduce the ability of the bone marrow to make white blood cells. * Low repeated exposures may scar the lungs. * Exposure may damage the liver and kidneys. * After exposure, some Thorium Dioxide is retained in the bones and other body organs for many years. IDENTIFICATION Thorium Dioxide is a heavy, white, crystalline (sand-like)
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Thoriated electrodes are used in TIG welding. TIG welders, along with persons who grind thoriated electrodes and persons located near relevant welding and grinding sites, might be at risk of thorium intake. The isotopes of radiological relevance are 232Th, 230Th, and 228Th. The studies described in the literature do not provide a consistent ...
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years of exposure. Thorium is not known to cause birth defects or affect the ability to have children. In animal studies, lung damage was seen after breathing high levels of thorium for 3–6 months. Placing thorium on the testicles of rats caused swelling of the testicles and changes in sperm. Agency for Toxic Substances and Disease Registry
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Thorium bioaccumulation and fatty acids (FAs) were measured after 4 weeks to two exposure conditions: a control (C0) and Th (C10). Some major FAs such as C16:1n-7 and the docosahexaenoic acid C22:6n-3 differed significantly between control …
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Significant exposure to thorium requires special exposure scenarios (Fisenne et al. 1987). People who consume foods grown in high background areas, reside in homes with high thorium background levels, or live near radioactive waste disposal sites may be exposed to higher than normal background levels of thorium. Workers in
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Thorium has the ability to change genetic materials. People that are injected with thorium for special X-rays may develop liver disease. Thorium is radioactive and can be stored in bones. Because of these facts it has the ability to cause bone cancer many years after the exposure has taken place.
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New NIOSH Thorium Exposure Bounding Method – Although M&C only analyzed Building 10 subsurface samples for uranium in 1995, NIOSH can bound thorium exposures during maintenance work. • Assuming that the subsurface sediments contained equivalent amounts of natural uranium and thorium-232.
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Exposure to higher levels of thorium may occur if a person lives near an industrial facility that mines, mills, or manufactures products with thorium. Thorium-232 on the ground is of a health risk because of the rapid build-up of radium-228 and its associated gamma radiation. Thorium-232 is typically present with its decay product radium-
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Thorium is a radioactive chemical element that can be found in soil and rocks. In its purest form, it appears as a silver metal, but when heated in the air, it becomes like a white light, like lightning. Thorium is currently used in things such as light bulbs and camera lenses.
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