Promethium (formerly prometheum) is a chemical element with symbol Pm and atomic number 61.
Promethium (formerly prometheum) is a chemical element with symbol Pm and atomic number 61.
Technetium and promethium are unusual among the light elements, because they have no stable isotopes.
Technetium and promethium are unusual light elements in that they have no stable isotopes.
In 1963, ion-exchange methods were used at ORNL to prepare about ten grams of promethium from nuclear reactor fuel processing wastes.[17][44][45]
The most frequently used sources are carbon-14 (with an activity of 3.5 megabecquerels - MBq) or prometheum-147 (with an activity of 9 MBq).
measurement of the level or thickness of materials such as paper, fabric, plastic, or thin metal using gauges (krypton-85, caesium-137, americium-241, cobalt-60 or prometheum-147);
The sources used are generally krypton-85 or prometheum-147, with activities of 3 GBq at the most. ∙ ∙ Liquid level measurement: a gamma radiation beam passes through the container holding the liquid.
Requêtes fréquentes français :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
Requêtes fréquentes anglais :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
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