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promethium SAM.

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promethium KEM.

promet m. spol

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Compared to the lanthanides, which (except for promethium) are found in nature in appreciable quantities, most actinides are rare. en.wikipedia.org

Radioisotopes such as tritium, nickel-63, promethium-147, and technetium-99 have been tested. en.wikipedia.org

Promethium-147 is produced in large quantities (compared to other isotopes) by bombarding uranium-235 with thermal neutrons. en.wikipedia.org

Its most striking characteristic is the presence of the unstable element promethium in its emission spectrum. en.wikipedia.org

The second-lightest, exclusively radioactive element, promethium, has an atomic number of 61. en.wikipedia.org

Only the highly unstable and radioactive promethium rare earth is quite scarce. en.wikipedia.org

Where indefinite self-luminosity in darkness was required, safer radioactive promethium paint was initially used, later replaced by tritium which continues to be used today. en.wikipedia.org

If a promethium leak is found, the area should be identified as hazardous and evacuated, and emergency services must be contacted. en.wikipedia.org

Lighter unstable isotopes of samarium primarily decay by electron capture to isotopes of promethium, while heavier ones convert through beta decay to isotopes of europium. en.wikipedia.org

In the periodic table, it is located to the right of the actinide uranium, to the left of the actinide plutonium and below the lanthanide promethium. en.wikipedia.org

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