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exposure thorium dusts

Health Effects Following Longterm Exposure to Thorium Dusts A Fourteenyear Followup study in China Chen Xing an Cheng Young e Zhen Rong Laboratory of Industrial Hygiene Ministry of Public Health 8018 Beijing 100088 China INTRODUCTION A fourteenyear followup study was carried out at Baiyan Obo Rareearth Iron Mine in China It has been

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  • Thorium CancerCausing Substances National Cancer

    The primary ways people are exposed to thorium are inhalation intravenous injection ingestion and absorption through the skin More than 25 million people worldwide were exposed to thorium in Thorotrast between 1930 and 1950 Once injected Thorotrast remains in the body resulting in lifelong exposure to thorium

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  • Addendum for Thorium

    exposure in former thorium workers at the Lindsay operational facility of the KerrMcGee Chemical Company The study population included 3200 men who extracted and purified thorium and rare earth metals from monazite ores at the facility’s thorium mill in Chicago and West Chicago IL from 1932­

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  • ATSDR Public Health Statement Thorium

    Jan 21 2015 · Thorium is a naturallyoccurring radioactive metal Small amounts of thorium are present in all rocks soil aboveground and underground water plants and animals These small amounts of thorium contribute to the weak background radiation for such substances Soil commonly contains an average of about 6 parts of thorium per million parts ppm of soil

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  • Thorium Metal SDS

    CHRONIC EXPOSURE – The toxic action of thorium resides more in its chemical action on the renal tubules rather than radiation effects Rats injected with thorium metal in the femoral marrow developed sarcomas whether this was due to metallocarcinogenic or radiocarcinogenic ingestion of alpha emitters

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  • Addendum for Thorium

    workers with potential for longterm exposure to thorium and silica dusts in ore 004 ThO 2 10 SiO2 plus the progeny of thoron 220Rn at a rareearth iron mine in China As of 2001 a total of 6983 miners and staff members had been identified 3016 of whom were considered to have been exposed to thorium

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  • Recent results from a study of thorium lung burdens and

    The higher SMR of lung cancer mortality in the dustexposed miners is likely to be due to the longterm exposure to thoriumcontaining dusts carcinogens are ThO 2 and SiO 2 and thoron progeny As calculated radiation doses from the exposures do not account for the observed lung cancer excess

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  • Inhalation and retention of thorium dusts by mineral sands

    Industry management 92 Inhalation and retention of thorium dusts 93 and employees through a concern about the likely longterm health implications of exposure to radioactive dust have both been anxious to ascertain the extent of past exposure and have supported a

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  • THE QUESTIONS OF HEALTH HAZARDS FROM THE

    The insoluble compounds of uranium and thorium particularly the oxides are important in the development of atomic energy Thc questions of health hazards from exposures to dusts of these insoluble compounds are strikily simlar in many but not all

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  • Microanalysis of ParticleBased Uranium Thorium and

    Feb 04 2019 · Dusts containing percent levels of uranium plutonium americium and both mineral and metallic thorium were detected outside of radiationcontrolled areas These radioactive dusts are a potential source of internal radiation exposure to nuclear

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  • Health effects following longterm exposure to thorium

    Download Citation Health effects following longterm exposure to thorium dusts A twentyyear followup study in China A twentyyear followup study was carried out at Baiyun Obo Rareearth

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  • Dusts Fumes and Mists in Industry

    made of the exposure and the na­ dustrial dusts Radium thorium Figure 2 Metal volatilized by the heat of welding later condenses to form a fume On this benchwelding installation fumes are removed at their point of origin by a properly located local exhaust installation

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  • Radionuclide Basics Thorium Radiation Protection US EPA

    Thorium chemical symbol Th is a naturally occurring radioactive metal found at trace levels in soil rocks water plants and animals Thorium is solid under normal conditions There are natural and manmade forms of thorium all of which are radioactive In general naturally occurring thorium exists as Th232 Th230 or Th228

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  • Potential Human Health Effects of Uranium Mining

    Uranium mining and processing are associated with a wide range of potential adverse human health risks Some of these risks arise out of aspects of uranium mining and processing specific to that enterprise whereas other risks apply to the mining sector generally and still others are linked more broadly to largescale industrial or construction activities

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  • Waste Disposal Massachusetts Institute of Technology

    Because of the elevated thorium levels in and around the mine the Healthcare Research Centre performed a twentyyear followup study on health effects following longterm exposure to thorium dusts This study concluded that the mortality rate of lung cancer has significantly increased for the workers in Baotou because of the thorium

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  • 17th International Symposium on Epidemiology in

    P138 Personnel exposure to nonionizing electromagnetic radiation in hospital physiotherapy departments C Szanto P139 Evaluation of noise pollution and its effects on the auditory system among workers who work in SPP unit in Arak Azarab Company S Samadi et al P140 Health effects following long term exposure to thorium dusts a

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  • Inhalation and retention of thorium dusts by mineral sands

    Industry management 92 Inhalation and retention of thorium dusts 93 and employees through a concern about the likely longterm health implications of exposure to radioactive dust have both been anxious to ascertain the extent of past exposure and have supported a

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  • Dust Exposure an overview ScienceDirect Topics

    Occupational Exposure to Dusts There is a causal link between occupational dust exposure and the development of mucus hypersecretion In addition longitudinal studies in workforces exposed to dust show an association between dust exposure and a more rapid decline in FEV 1 Selection bias must be considered in these associations resulting

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  • Health Effects Following Long Chen

    possible health effects of dustinhaled miners following longterm exposure to thorium dusts An electrostatic collection system was used to measure the exhaled thoron activity of each examinee through simple calculation each examinee’s thorium lung burden obtained

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  • PDF Assessing Human Exposure to Contaminants in

    Activities of individual uranium thorium or plutoniumbearing dust particles varied by five orders of magnitude ranging from 0005 mBq millibecquerel to 2270 mBq Hanford workplace dusts

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  • Recent results from a study of thorium lung burdens and

    The average measured thorium lung burden for the highdustexposure miners was significantly greater than that for the group of lowerexposure miners and the incidence of severe breathlessness and pneumoconiosis of stage 0 was also significantly raised in the highexposure group relative to the lowexposure group An epidemiological study of

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  • BEST PRACTICE FOR IRON ORE COAL DUST

    BEST PRACTICE FOR IRON ORE COAL DUST thorium or radium the following is recommended Dust control is extremely important but weather will affect exposure to personnel via dust clouds ADMINISTRATION CONTROLS Training signage restricting time of exposure staff rotation away from exposure to respirable dusts Personnel to be aware of

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  • Copper dusts and mists as Cu CDC

    A meta description is an HTML tag in the HTML code of your website which allows you to customize a section of text that describes the page itself It plays a role in how your page is seen by search engine crawlers and how it appears in SERPs

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  • 5 Potential Human Health Effects of Uranium Mining

    Key Points • Uranium mining and processing are associated with a wide range of potential adverse human health risks Some of these risks arise out of aspects of uranium mining and processing specific to that enterprise whereas other risks apply to the mining sector generally and still others are linked more broadly to largescale industrial or construction activities

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  • 1988 OSHA PEL Project Particulates NIOSH CDC

    The ACGIH and OSHA both had intended this limit to apply to all particulates organic and inorganic Exposure to organic particulates at high levels also causes material health impairment such as throat skin and eye irritation upperrespiratorytract problems and

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  • Workplace exposure limits COSHH

    What is exposure Exposure to a substance is uptake into the body The exposure routes are By breathing fume dust gas or mist By skin contact By injection into the skin By swallowing Many thousands of substances are used at work but only about 500 substances have Workplace Exposure Limits WELs listed in EH40 workplace exposure limits

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  • Thorium lung burdens of mineral sands workers

    Thorium lung burdens have been measured in workers in the dry separation plants operated by the mineral sands industry in Western Australia The data have been compared with historical employment records of the workers exposure to thoriumbearing airborne dusts in order to assess the reliability of personal air sampling and with the

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  • Respiratory Symptoms and Occupational Dust Exposure In

    Occupational exposure to organic and inorganic dusts may result in symptoms of chronic respiratory investigate the utility of obtaining a history of occupational exposure to dust in US veterans a respiratory health survey was conducted between

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  • 17th International Symposium on Epidemiology in

    P138 Personnel exposure to nonionizing electromagnetic radiation in hospital physiotherapy departments C Szanto P139 Evaluation of noise pollution and its effects on the auditory system among workers who work in SPP unit in Arak Azarab Company S Samadi et al P140 Health effects following long term exposure to thorium dusts a

    Details
  • Radiation Timeline Cure Today

    Jun 17 2005 · The Life Span Study of 94000 survivors reports in 1997 that of approximately 9300 cancer deaths an estimated 5 percent are attributable to radiation exposure 1950s Use of Thorotrast thorium dioxide a radioactive material employed as a contrast agent in medical radiology was discontinued after it was found to cause various types of cancer

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