Exposure Thorium Dusts


Health Effects Following Long-term Exposure to Thorium Dusts

Conclusion: It is suggested that the difference results long-term exposure to thorium-containing dusts (carcinogens are ThO2 and SiO2) and thoron progeny This is the first evidence in humans of the carcinogenicity after long-term inhalation of thorium-containing dusts and thoron progeny


Exposure Thorium Term

Health Effects Following LongTerm Exposure to Thorium Health Effects Following LongTerm Exposure to Thorium Dusts A 14 Year Followup Study in China Free download as PDF File (pdf), Text File (txt) or read online Get Price; EXPOSURE TO CADMIUM: A MAJOR PUBLIC … EXPOSURE TO CADMIUM: A MAJOR PUBLIC HEALTH CONCERN


Health Effects Following Long-term Exposure to Thorium

Health Effects Following Long-term Exposure to Thorium Dusts A Fourteen-year Follow-up study in China Chen Xing an, Cheng Young e, Zhen Rong Laboratory of Industrial Hygiene, Ministry of Public Health POBox 8018, Beijing, 100088, China INTRODUCTION A fourteen-year follow-up study was carried out at Baiyan Obo Rare-earth Iron Mine in China


Health effects following long-term exposure to thorium

The purpose of this study is to investigate possible health effects in dust-exposed miners following long-term exposure to thorium-containing dusts and thoron progeny


Health effects following long-term exposure to thorium

dust-exposed miners following long-term exposure to thorium-containing dusts and thoron progeny By using the negative high voltage exhaled thoron progeny measurement system to estimate the miner s thorium lung burden The highest thorium lung burden among 1 …


Microanalysis of Particle-Based Uranium, Thorium, and

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


Thorium - Cancer-Causing Substances - National Cancer

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 Although thorium is widespread in the environment, most people are not exposed …


Addendum for Thorium - atsdrcdcgov

Ali et al (2014) evaluated the cellular effects of thorium nitrate on human-derived liver cells (HepG2) Exposure for 72-h to 01-10 µM concentrations of thorium increased proliferation by 40-60%, while exposure to ≥50 µM solution was ineffective Effects of the lower doses were then evaluated


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 long-term health implications of exposure to radioactive dust, have both been anxious to ascertain the extent of past exposure and have supported a …


Thorium Metal SDS | IBILABS

SECTION 11: TOXICOLOGY INFORMATION CHRONIC EXPOSURE – The toxic action of thorium resides more in its stone 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


Radioactive dust from nuclear work found in workers’ homes

Feb 12, 2019 · Dusts containing percent levels of uranium, plutonium, americium, and both mineral and metallic thorium were detected outside of radiation-controlled areas These radioactive dusts are a potential source of internal radiation exposure to nuclear site workers, or …


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 long-term health implications 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


ATSDR - Public Health Statement: Thorium

Jan 21, 2015 · Thorium is a naturally-occurring, radioactive metal Small amounts of thorium are present in all rocks, soil, above-ground 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


5 POTENTIAL FOR HUMAN EXPOSURE 51 OVERVIEW

72 5 POTENTIAL FOR HUMAN EXPOSURE thorium-228, however, is less than 16 pm (Hirose and Sugimura 1987) and may travel longer distances than both thorium-230 and thorium-232 Like other particulate matter in the atmosphere, thorium will be transported from the atmosphere to soil and water by wet and dry deposition


Microanalysis of Particle-Based Uranium, Thorium, and

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


Data on Pyrophoricity of Thorium - Harvard University

Thorium is pyrophoric and radioactive As a dry powder it has a low ignition temperature Thorium powder is shipped under helium or argon gases in special containers When poured through air, it is subject to ignition by electrostatic spark It should be handled cautiously with a nonsparking spoon or scoop


Uranium and Thorium Safety - Safety Services - The

Occupational exposure pathways and risk assessment The risks associated with exposure to unprocessed uranium and thorium are not trivial, and potentially very high if the exposure pathway is the inhalation of suspended dusts and aerosols These radionuclides are so hazardous because they are alpha emitting radionuclides


EPA Facts about Thorium

EPA Facts about Thorium What is thorium? Thorium is a naturally occurring radioactive metal that is found at low levels in soil, rocks, water, plants, and animals Almost all naturally occurring thorium exists in the form of either radioactive isotope thorium-232, thorium-230, and thorium …


Atmospheric thorium pollution and inhalation exposure in

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 232Th in total suspended particulate (TSP) were measured in the vicinity of the largest rare …


THORIUM NITRATE HAZARD SUMMARY WORKPLACE …

* Thorium Nitrate can irritate the skin causing a rash or burning feeling on contact * Exposure to Thorium Nitrate can irritate the eyes, nose, and throat * Exposure can reduce the ability of the stone marrow to make blood cells * Repeated exposure to Thorium Nitrate may affect the liver and kidneys and cause scarring of the lungs


Hazard of Thoriated Tungsten Dust Arising from Re-grinding

The exposure of the whole body due to the continuous use of a single electrode has been assessed to be less than 100 uSv per year Again, this is a small fraction of the maximum permissible dose In conclusion, radiation hazard is not a health issue when exposed to the thoriated tungsten electrodes


HEALTH EFFECTS - Toxicological Profile for Uranium - NCBI

Immunotoxicity The use of depleted uranium munitions by the military has resulted in the potential uranium exposure to military personnel and civilians; additional research regarding the health effects of acute-duration inhalation exposure to depleted uranium …


SAFETY DATA SHEET (SDS) - Tungsten Electrodes

Tungsten-Thorium Oxide alloys are generally safe to handle during use under almost all normal conditions and environments However, special precautions must be taken during the grinding or machining of tips of electrodes that contain Thorium Oxide to avoid the generation and subsequent inhalation and ingestion of dusts from these operations


Tungsten Thoriated - espimetals

Thorium Dioxide No exposure limit established No exposure limit established Engineering Controls : Ensure adequate ventilation to maintain exposures below occupational limits Whenever possible the use of local exhaust ventilation or other engineering controls is the preferred method of controlling exposure to airborne dust and fume to meet established occupational exposure limits


SAFETY DATA SHEET (SDS) - Tungsten Electrodes

Tungsten-Thorium Oxide alloys are generally safe to handle during use under almost all normal conditions and environments However, special precautions must be taken during the grinding or machining of tips of electrodes that contain Thorium Oxide to avoid the generation and subsequent inhalation and ingestion of dusts from these operations


Uranium and Thorium Safety - Safety Services - The

Occupational exposure pathways and risk assessment The risks associated with exposure to unprocessed uranium and thorium are not trivial, and potentially very high if the exposure pathway is the inhalation of suspended dusts and aerosols These radionuclides are so hazardous because they are alpha emitting radionuclides


MATERIAL SAFETY DATA SHEET (MSDS)

Tungsten-Thorium Oxide alloys are generally safe to handle during use under almost all normal conditions and environments However, special precautions must be taken during the grinding or machining of tips of electrodes that contain Thorium Oxide to avoid the generation and subsequent inhalation and ingestion of dusts from these operations


Human Exposure to Heavy Metals - journalchestnetorg

levels of thorium ('Ib~ which is generally present as an Rare earth (RE) pneumoconiosis is an uncommon occupational inorganic dust disease caused by a long-term exposure of workers toRE dusts1 A review of the literature reveals that there is very little infOrmation …


RE: Hazen Research ­ Thorium exposure calculation with the

The calculated thorium exposure value of 765 E-13 just exceeds the Thorium DAC of 5 E-13 Given that employees working on thorium-containing ore are required to wear respirators with HEPA filters, and that employees are exposed to thorium-containing ores much less that the 2000 hours used in the DAC


Manual on Radiological Safety in Uranium and Thorium …

on Radiological Safety in Uranium and Thorium Mines and Mills Sponsored by the IAEA and ILO MANUAL ON RADIOLOGICAL SAFETY IN URANIUM AND THORIUM MINES AND MILLS IAEA, VIENNA, 1976 STI/PUB/449 ISBN 92-0-123176-8 hazardous gases and dusts


Tungsten Thoriated - espimetals

Thorium Dioxide No exposure limit established No exposure limit established Engineering Controls : Ensure adequate ventilation to maintain exposures below occupational limits Whenever possible the use of local exhaust ventilation or other engineering controls is the preferred method of controlling exposure to airborne dust and fume to meet established occupational exposure limits


Printing date 20/01/2011 Reviewed on 01/01/2017 Safety

Thorium Oxide have a special hazard if dusts or powders are produced and inhaled during use or grinding of tips of the electrodes, as thorium compounds are suspected of …


Thorium exposure - RightDiagnosis

Thorium exposure symptoms, causes, diagnosis, and treatment information for Thorium exposure (Chemical poisoning - Thorium) with alternative diagnoses, full-text book chapters, misdiagnosis, research treatments, prevention, and prognosis


Thorium Dioxide Toxicity (hazard) - digitalfire

VI-Wash thoroughly immediately after exposure to Thorium Dioxide and at the end of the workshift VII-Post hazard and warning information in the work area In addition, as part of an ongoing education and training effort, communicate all information on the health and safety hazards of Thorium Dioxide to potentially exposed workers


NIOSHTIC-2 Publications Search - 20042414 - stone

Chemical exposure and hearing loss For instance, in 2005 approximately 30% of the European workers reported being exposed to noise during at least a quarter of the time spent in their work environment, 11 % reported inhaling vapors such as solvents and thinners: 19% reported exposure to …


Thorium Bar - Official Thorium Mod Wiki

Thorium Bars are crafted with 4 Thorium Ore at a Thorium Anvil, and are one of the first tier of crafting materials In addition to being crafted, they can also be obtained from Strange Crates after defeating the Eye of Cthulhu, before defeating Plantera


Makale » DergiPark

The toxicity risks of being over exposed to ionizing radiation in the environments are of great concern to scientists The distribution of radioactivity concentrations of thorium, uranium and potassium were studied in randomly selected soil samples from ten (10) farm locations in Odo Oba, southwestern Nigeria in order to determine the radiological risks of farmers’ exposure to radionuclides


PRO TECT IV EQU PMEN - Midwest Tungsten Shop

over-exposure to Tungsten powders via inhalation can aggravate lung disorders RECOMMENDATIONS TO PHYSICIANS: When personnel have chronic exposure to dusts from electrodes that contain Thorium Oxide, monitoring of personnel for early symptoms and changes such as abnormal leukocytes in the blood smear may be of value