exposure thorium term

Difference Between Uranium and Thorium | Definition ...

Sep 12, 2017· Thorium can involve in the formation of inorganic and coordination compounds. Since Thorium is more abundant than Uranium, Thorium can be used as an alternative for Uranium in nuclear power plants. However, Thorium is hazardous due to its radioactivity. But Thorium slowly decays and it tends to emit alpha radiation. Therefore, the exposure to ...

Addendum for Thorium - atsdr.cdc.gov

workers with potential for long-term exposure to thorium and silica dusts in ore (0.04% ThO. 2, 10% SiO2) plus the progeny of thoron (220Rn) at a rare-earth iron mine in China. As of 2001, a total of 6,983 miners and staff members had been identified, 3,016 of whom were considered to have been exposed to thorium

Health Effects Following Long-term Exposure to Thorium Dusts

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. The total person-years of observation for the dust-exposed miners and the controls were 62712 and 34672 ...

A 20-year follow-up study on chronic respiratory effects ...

ABSTRACT: In order to evaluate chronic effects of long-term exposure to cotton dust on respiratory health, and the role of dust and endotoxin, longitudinal changes in lung function and respiratory symptoms were observed prospectively from 1981 to 2001 in 447 cotton textile

Thorium - Cancer-Causing Substances - National Cancer ...

The primary ways people are exposed to thorium are inhalation, intravenous injection, ingestion, and absorption through the skin. More than 2.5 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.

Exposure Thorium Term - apeda.org.in

Thorium and Thorium Dioxide Reference Module in . Thorium accumulates in the liver, spleen, lymph nodes, and bone marrow, leading to longterm exposure with a diversity of cells. Thorium is retained the longest when it has entered the body in the form of an insoluble compound.

Health and Safety Aspects of Thorium Production – Energy ...

Jul 09, 2006· To recognize exposure problems that may be encountered and to install the controls necessary to protect personnel, a thorough understanding of the radioactive decay of thorium is necessary. The thorium decay series begins with Th-232, which has a radioactive half-life of 13.9 billion years, and ends with the formation of Pb-208, a stable isotope.

Thorium dictionary definition | thorium defined

With Three Hours' Exposure He Found The Thorium Emanation Only From 3 To 5% Of The Whole, But With 12 Hours' Exposure The Percentage Of Thorium Emanation Rose To About 15. (For the significance of this fact see Radioactivity.) The richest known source is thorianite, which consists mainly of thorium oxide, and contains 9.5 cc. of helium per gram.

Atmospheric thorium pollution and inhalation exposure in ...

Dec 01, 2016· Atmospheric thorium pollution was investigated around the Bayan Obo rare earth mine. • 232 Th concentrations were significantly higher than the world reference of 0.5 μBq m − 3. • A self-organizing map was used to identify spatiotemporal pattern of airborne thorium. • The inhalation exposure results show a high radioactive risk for ...

thorium fuel no panacea for nuclear powerthorium - tambinh.nl

thorium fuel no panacea for nuclear powerthorium ... thorium processing pour thorium ore natural thorium wear parts uranium thorium including uranium thorium typical uranium thorium consequently exposure thorium term thorium energy annual uranium thorium using thorium uranium sand thorium vsi crusher thorium submerged chain conveying thorium ...

Long term health effects of thorium compounds on exposed ...

Long term health effects of thorium compounds on exposed workers: the complete blood count. Conibear SA. 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 …

Savannah River Site Special Exposure Cohort Petition ...

A class be added to the Special Exposure Cohort based on internal thorium exposures in 773A and the TNX facilities Class definition based on external monitoring • Workers likely exposed • Workers who may have been exposed • Workers who were not exposed

Uranium) Radionuclides (including Radon, Radium and

inhalation exposure to uranium. Chronic (long-term) inhalation exposure to uranium and radon in humans has been linked to respiratory effects, such as chronic lung disease, while radium exposure has resulted in acute leukopenia, anemia, necrosis of the jaw, and other effects. Cancer is the major effect of concern from the radionuclides.

Overview of Plutonium and Its Health Effects

Plutonium was discovered in 1940 in Berkeley, California. Since then, its production and use in nuclear power and nuclear weapons have exposed people around the world to radiation. This exposure is a source of possible adverse health effects. The following is an overview of plutonium and its health effects. This overview is an attempt to

SAFETY DATA SHEET THORIUM OXIDE - ThO2 (IMPURITY …

Short Term Exposure: May cause irritation, redness and swelling of the eyes and eye damage. Long Term Effects: Same as short term exposure with increased risk of eye damage due to scratching of corneas and radiation induced cataracts. INGESTION: Short Term Exposure: May cause irritation of the digestive tract. Long Term Effects: May cause liver ...

Radon Poisoning: Symptoms, Risk Factors, and More

Aug 07, 2017· Radon is a naturally occurring radioactive gas. It's produced when uranium, thorium, and radium break down in soil, rock, and water. It's then released into the air. Radon is odorless ...

Thorium-232 | Th - PubChem

Thorium is a natural radioactive chemical element with the symbol Th and atomic number 90. In nature, virtually all thorium is found as thorium-232, and it decays by emitting an alpha particle, and has a half-life of about 14. 05 billion years (other, trace-level isotopes of thorium …

HEALTH EFFECTS - Toxicological Profile for Uranium - NCBI ...

The health effects associated with oral or dermal exposure to natural and depleted uranium appear to be primarily chemical in nature and not radiological, while those from inhalation exposure may also include a slight radiological component, especially if the exposure involves prolonged exposure to insoluble uranium compounds.

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. P.O.Box 8018, Beijing, 100088, China INTRODUCTION A fourteen-year follow-up study was carried out at Baiyan Obo Rare-earth Iron Mine in China ...

Thorium Metal SDS | IBILABS.com

Thorium metal usually does not constitute an external radiation exposure hazard since it emits mainly alpha-radiation at a low energy level. It may constitute an internal radiation hazard if it is absorbed into the body, thus delivering alpha emission onto tissues in which it is stored.

Radionuclide Basics: Thorium | Radiation Protection | US EPA

Radionuclide Basics: Thorium. ... However, people who live near thorium mining areas or near certain legacy industrial facilities may have increased exposure to thorium. Occasionally, items may be found with thorium in them, such as some older ceramic wares in which uranium and thorium were used in the glaze. These generally do not ...

Radon and Cancer - National Cancer Institute

Radon is a radioactive gas released from the normal decay of the elements uranium, thorium, and radium in rocks and soil. It is an invisible, odorless, tasteless gas that seeps up through the ground and diffuses into the air. In a few areas, depending on local geology, radon dissolves into ground water and can be released into the air when the water is used.

Thorium dioxide | ThO2 - PubChem

Thorium Dioxide is a radioactive crystalline solid compound used in a broad range of industrial applications. Thorium dioxide was utilized as a radiographic contrast agent; however, it is no longer considered safe for use in human patients because it was found to be a carcinogen that can cause cholangiocarcinoma.

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. Chronic Health Effects The following chronic (long-term) health effects can occur at some time after exposure to Thorium Nitrate and can last for months or years: Cancer Hazard

Thorium As Nuclear Fuel: the good and the bad

Thorium As Nuclear Fuel Thorium is a basic element of nature, like Iron and Uranium. Like Uranium, its properties allow it to be used to fuel a nuclear chain reaction that can run a power plant and make electricity (among other things).

Thorium Is About to Explode, 1769 - YouTube

Aug 28, 2017· There are some technical problems to solve, such as the corrosive effects of long-term exposure to the high-temperature thorium salts used in the …

Nuclear Energy: the Good, the Bad, and the Debatable ...

thorium series. and the actinium series. For example, the uranium series starts with Uranium ... term sun exposure (even without sunburns) be enough to give you cancer? How would you go ... Exposure to alpha radiation is considered to be 20 times more severe than exposure to

Thorium - Wikipedia

Exposure to an aerosol of thorium, such as contaminated dust, can lead to increased risk of cancers of the lung, pancreas, and blood, as lungs and other internal organs can be penetrated by alpha radiation. Exposure to thorium internally leads to increased risk of liver diseases.

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