Learn the Issues
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Radionuclide Basics: Thorium
Thorium is a naturally occurring radioactive metal found at trace levels in soil, rocks, plants and animals. Thorium is used very little in industry, but can be found in heat-resistant alloys and paints and optical lenses.
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Radionuclide Basics: Tritium
Tritium is a hydrogen atom that has two neutrons in the nucleus and one proton. It is radioactive and behaves like other forms of hydrogen in the environment. Tritium is produced naturally in the upper atmosphere and as a byproduct of nuclear fission.
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Radionuclide Basics: Uranium
Uranium (chemical symbol U) is a naturally occurring radioactive element. Uranium is a primordial element that is used in nuclear power generation. Uranium is no longer mined for defense purposes.
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Radionuclide Basics: Radon
Radon (chemical symbol Rn) is an odorless, colorless, radioactive gas. It is the second leading cause of lung cancer in the United States.
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Radionuclide Basics: Strontium-90
Strontium (chemical symbol Sr) is a silvery metal that rapidly turns yellowish in air. Naturally occurring strontium is not radioactive.
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Radionuclide Basics: Radium
Radium (chemical symbol Ra) is a naturally occurring radioactive element. The most common isotopes of radium are radium-226 and radium-228.
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Performance Partnership Grants for Tribes in Region 10
Performance Partnership Grants (PPGs) for tribes in EPA's Region 10 (Pacific Northwest and Alaska).
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Radionuclide Basics: Plutonium
Plutonium (chemical symbol Pu) is a radioactive metal. Plutonium is considered a man-made element. Plutonium-239 is used to make nuclear weapons. Pu-239 and Pu-240 are byproducts of nuclear reactor operations and nuclear bomb explosions.
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Radionuclide Basics: Iodine
Iodine (chemical symbol I) is produced commercially for medical and industrial uses through nuclear fission. Iodine-129 and I-131 are the radioisotopes that are commonly used and will have the greatest impact on the environment if released.
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Radionuclide Basics: Cesium-137
The most common radioactive form of cesium (chemical symbol Cs) is Cesium-137. Cesium-137 is produced by nuclear fission for use in medical devices and gauges and is one of the byproducts of nuclear fission in nuclear reactors and nuclear weapons testing.
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Data & Data Products: Substance Registry Services Widget
Information and embed code for EPA's SRS Widget
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The EPA Office of Inspector General Identifies Lapse in EPA Tracking of Build America, Buy America Act Waivers for Infrastructure Projects
The EPA Office of Inspector General Identifies Lapse in EPA Tracking of Build America, Buy America Act Waivers for Infrastructure Projects
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Federal Facilities Library
The library is a repository of information about federal-facility restoration and reuse.
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2024 Safer Choice Partner of the Year Award Winners
Profiles of the winners of the 2024 Safer Choice Partner of the Year Awards
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The EPA Office of Inspector General Issues a Fraud Alert on New Phishing Scam Involving Notice of Violation Letters
The EPA Office of Inspector General Issues a Fraud Alert on New Phishing Scam Involving Notice of Violation Letters
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2021 Safer Choice Partner of the Year Award Winners: Profiles
Profiles of the winners of the 2021 Safer Choice Partner of the Year Awards
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Philadelphia Navy Yard Site Spotlight - Text Only Version
Monthly feature to highlight a superfund site that has been put in reuse.
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Philadelphia Navy Yard Site Spotlight
Monthly feature to highlight a superfund site that has been put in reuse.
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Data Stories
Data Stories highlights different uses for EPA data to inspire others to find ways to answer their own questions with EPA data
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Hunt's Disposal Landfill Five-Year Review
EPA is conducting a five-year review of the Hunt’s Disposal Landfill site.