The first discovery of pitchblende in the United States was associated with gold ores at the Wood mine in Gilpin County. |
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The hint of a new element in pitchblende materialized in July 1898, when the couple reported gathering a substance that was 400 times more active than metallic uranium. |
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It is worth recalling the history of this treatment, which began when American, James Douglas, discovered extensive pitchblende deposits on his Western mining properties. |
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The Curies resolved to learn as much as they could about the source of radioactivity in pitchblende, the ore with which Becquerel originally worked. |
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The most common ore of the element is pitchblende, although it is also present in other minerals, such as uraninite, carnotite, uranophane, and coffinite. |
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It was a waste product from the production of radium from the pitchblende deposits around Great Bear Lake in northern Canada. |
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He was probably one of the few Canadian prospectors of that time who could have identified the pitchblende mineral. |
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During the early years of radium and uranium refinery operations in Port Hope, highgrade pitchblende ores were processed. |
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The waste dates back to the 1930s when radium was extracted from pitchblende ores for medical and industrial applications at a refinery in the municipality. |
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The first element to be discovered by radiochemical analysis, polonium was discovered in 1898 by Pierre and Marie Curie, who were investigating the radioactivity of a certain pitchblende, a uranium ore. |
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By the hypothesis of the existence of a very radioactive unknown substance present in very small quantity, she undertook, with Pierre Curie, research for this substance in the uranium mineral called pitchblende. |
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By 1902, 0.1 gram of pure radium chloride was prepared by refining several tons of pitchblende residues, and by 1910 Marie Curie and André-Louis Debierne had isolated the metal itself. |
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During the early years of refinery operations, high-grade pitchblende ores from the Port Radium mine in the Northwest Territories were shipped to Port Hope and processed for the recovery of radium. |
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A ton of pitchblende ore contains about 0.15 mg of actinium. |
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