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exposure thorium term

  • SDSThorium Oxide Impurity Standard DOE Office of Science

    Long Term Effects: Same as short term exposure with increased risk of eye damage due to scratching of corneas and radiation induced aracts. INGESTION: Short Term Exposure: May cause irritation of the digestive tract. Long Term Effects: May cause liver and kidney damage. The toxicologic properties of this substance 

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  • Coal Ash Is More Radioactive Than Nuclear Waste Scientific

    Dec 13, 2007 Robert Finkelman, a former USGS coordinator of coal quality who oversaw research on uranium in fly ash in the 1990s, says that for the average person the byproduct accounts for a miniscule amount of background radiation, probably less than 0.1 percent of total background radiation exposure. According 

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  • Mechanism of carcinogenesis after exposure of actinide radionuclides

    Feb 1, 2017 Hence, the organ specificity and acute/longterm health effects of radionuclides (238 U and 232 Th) would be different even if they have similarities in their . During thorium mining and waste disposal, nuclear workers and public may be at the risk of exposure to 232 Th and its decay products [Table 1].

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  • Naturally Occurring Radioactive Materials NORM World Nuclear

    However, the term is used more specifically for all naturally occurring radioactive materials where human activities have increased the potential for exposure Longlived radioactive elements such as uranium, thorium and potassium and any of their decay products, such as radium and radon are examples of NORM.

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  • Atmospheric thorium pollution and inhalation exposure in the largest

    Exposure to radionuclide thorium (Th) has generated widespread public concerns, mainly because of its radio logical effects on human . Longterm mining activities have produced a large amount of tailings which discharged into the reservoir through open slots by circulating water. The openly dumped tailing covers an 

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  • Thorium (Th) Chemical properties, Health and Environmental effects

    People that live near these hazardous waste sites may be exposed to more thorium than usual because they breathe in windblown dust and because it ends up in food that is grown near the site. People that work in the mining, milling or thorium industries or laboratories may also experience thorium exposure that exceeds 

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  • 5 Potential Human Health Effects of Uranium Mining, Processing

    terms and units used for radiation activity, exposure, and dose. Additional information on current regulations and guidelines applicable to uranium is available in ATSDR (2011). The type of radiation exposure that may be encountered in uranium mining and processing varies by source material and work process (Table 5.3).

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  • Health Hazards Posed by Thorium

    The following chronic (longterm) health effects can occur at some time after exposure to Thorium Dioxide and can last for months or years: Cancer Hazard. * Thorium Dioxide is a CARCINOGEN in humans. It has been shown to cause lung cancer. * Many scientists believe there is no safe level of exposure to a carcinogen.

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  • The Thorium Lantern: Your Opportunity for Retail Radiation Exposure

    Mar 2, 2012 Problems with radioactivity arise in the longterm handling of the Thorium mantles, particularly in the manufacturing process, or when a lantern breaks and those gathered around the campfire earn a new scary story to tell about the time they inhaled radioactive dust. Cases of extreme exposure. The danger 

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  • thorotrast

    With a delay of 65 years after Thorotrast exposure, this historical case probably represents, to our knowledge, the most delayed HEPATIC ANGIOSARCOMA OCCURRING 65 YEARS AFTER THORIUM DIOXIDE EXPOSURE COULIER et al. 255. (normal value . of the long term effect of Th²³² in the depository organs (5 

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  • Thorium Wikipedia

    Thorium is a weakly radioactive metallic chemical element with symbol Th and atomic number 90. Thorium metal is silvery and tarnishes black when it is exposed to air, forming the dioxide it is moderately hard, malleable, and has a high melting point. Thorium is an electropositive actinide whose chemistry is dominated by 

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  • Long term health effects of thorium compounds on exposed workers

    Health Phys. 198344 Suppl 1:2317. Long term health effects of thorium compounds on exposed workers: the complete blood count. Conibear SA. Two hundred seventythree men exposed to thorium and other rare earths between 1940 and 1973 at a plant which refined monazite sand were studied at Argonne National 

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  • Long term health effects of thorium compounds on exposed workers

    Health Phys. 198344 Suppl 1:2317. Long term health effects of thorium compounds on exposed workers: the complete blood count. Conibear SA. Two hundred seventythree men exposed to thorium and other rare earths between 1940 and 1973 at a plant which refined monazite sand were studied at Argonne National 

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  • Thorium Fluoride, ThF4, for Optical Coating Materion

    There is low risk of external radiation exposure when handling generally licensed quantities of thorium compounds (150 lbs or less per year and a possession limit of 15 lbs). Radiation exposure to personnel should, however, be kept as low as reasonably achievable. Inhalation or ingestion of all alpha emitters should be 

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  • Dictionary of Radiation Terms Radiation Emergency Medical

    Its primary concern is the exposure of the public to, and the inhalation of, airborne radioactive contamination. The ingestion pathway EPZ extends about 50 miles in radius around a plant. Its primary concern is the ingestion of food and liquid that is contaminated by radioactivity. Enriched uranium: uranium in which the 

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  • inhalation and retention of thorium dusts by mineral sands workers

    Inhalation and retention of thorium dusts. 93 and employees, through a concern about the likely longterm health impliions of exposure to radioactive dust, have both been anxious to ascertain the extent of past exposure and have supported a range of bioassay research endeavours. This paper examines the inhalation 

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  • Health Hazards Posed by Thorium

    The following chronic (longterm) health effects can occur at some time after exposure to Thorium Dioxide and can last for months or years: Cancer Hazard. * Thorium Dioxide is a CARCINOGEN in humans. It has been shown to cause lung cancer. * Many scientists believe there is no safe level of exposure to a carcinogen.

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  • 5. Summary of Data Reported and Evaluation IARC Monographs

    The predominant type of radiation released by mixed emitters during longterm internal exposure is may be dominated, in terms of energy contribution, by one type of radiation, so that the radiobiological effect Similarly, exposure to thorium232, uranium isotopes and their shorterlived decay products is variable and 

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  • Dictionary of Radiation Terms Radiation Emergency Medical

    Its primary concern is the exposure of the public to, and the inhalation of, airborne radioactive contamination. The ingestion pathway EPZ extends about 50 miles in radius around a plant. Its primary concern is the ingestion of food and liquid that is contaminated by radioactivity. Enriched uranium: uranium in which the 

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  • Thorium dioxide an overview ScienceDirect Topics

    Thorotrast (thorium dioxide) was used as a radiologic contrast agent between 1928 and 1950. It is an alpha emitter with a biologic Angiosarcoma: thorium oxide (Thorotrast), vinyl chloride, arsenic, anabolic steroids Peripheral cholangiocarcinoma was reported in a patient 48 years after exposure to Thorotrast (46A).

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  • ATSDR Public Health Statement: Thorium

    1.3 How can thorium enter and leave my body? 1.4 How can thorium affect my health? 1.5 What levels of exposure have resulted in harmful health effects? 1.6 Is there a medical test to determine whether I have been exposed to thorium? 1.7 What recommendations has the federal government made to protect human health 

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  • 1 Depleted uranium: sources, exposure and health effects

    Health consequences are determined by the physical and chemical nature of the depleted uranium to which an individual is exposed, and to the level and duration of exposure. Longterm studies of workers exposed to uranium have reported some impairment of kidney function depending on the level of exposure. However 

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  • Atmospheric thorium pollution and inhalation exposure in the largest

    Exposure to radionuclide thorium (Th) has generated widespread public concerns, mainly because of its radio logical effects on human . Longterm mining activities have produced a large amount of tailings which discharged into the reservoir through open slots by circulating water. The openly dumped tailing covers an 

    Online
  • Thorium: the wonder fuel that wasn't Bulletin of the Atomic Scientists

    May 11, 2014 Uranium 233 compares favorably to plutonium in terms of weaponization a critical mass of that isotope of uraniumabout 6 kilograms, in its metal formis about the same weight as a plutonium critical mass. Unlike plutonium, however, uranium 233 does not need implosion engineering to be used in a 

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  • Health & Hazardous Waste: Vol 1 No 3

    Although sievert is the international unit, rem is the term more levels of exposure, but the longterm effects of exposure radium, thorium, uranium, plutonium, and other high molecular weight radioactive elements. Beta ($) radiation is an electron. Its smaller size and charge allow it to penetrate the body more easily (it can.

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  • ATSDR Public Health Statement: Thorium

    1.3 How can thorium enter and leave my body? 1.4 How can thorium affect my health? 1.5 What levels of exposure have resulted in harmful health effects? 1.6 Is there a medical test to determine whether I have been exposed to thorium? 1.7 What recommendations has the federal government made to protect human health 

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  • A 20year followup study on the effects of longterm exposure to

    Chin Med J (Engl). 2003 May116(5):6924. A 20year followup study on the effects of longterm exposure to thorium dust. Chen X(1), Cheng Y, Xiao H, Feng G, Deng Y, Feng Z, Chen L, Han X, Yang Y, Dong Z, Zhen R. Author information: (1)Laboratory of Industrial Hygiene, Ministry of Health, Beijing 100088, China.

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  • Facts About Thorium Live Science

    Feb 28, 2017 According to Lenntech, thorium was used in toothpaste until radioactivity dangers were discovered. Thorium and uranium are involved in the heating of Earth's interior, according to Minerals Eduion Coalition. Too much thorium exposure can cause lead to lung disease, lung and pancreatic cancer, alter 

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  • Thorium National Cancer Institute

    Mar 20, 2015 Learn about thorium, which can raise the risk of liver, lung, and pancreatic cancers. The primary ways people are exposed are inhalation, intravenous injection, ingestion, and absorption through the skin.

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  • Is the "Superfuel" Thorium Riskier Than We Thought?

    Dec 5, 2012 When thorium is irradiated, or exposed to radiation to prepare it for use as a fuel in nuclear reactions, the process forms small amounts of uranium232. That highly radioactive weapon," Ashley says. "The International Atomic Energy Agency views it the same as plutonium in terms of proliferation risk.".

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