Promethium
Occurrence, isolation & synthesis
OccurrenceIn nature, promethium is found in the Earth's crust, 4.5 · 10−20 ppm, in uranium ores [4]. Promethium has no stable isotopes, and the longest living isotope is 145Pm (T½ = 17.7 years) [4].
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OccurrenceIn nature, promethium is found in the Earth's crust, 4.5 · 10−20 ppm, in uranium ores [4]. Promethium has no stable isotopes, and the longest living isotope is 145Pm (T½ = 17.7 years) [4].
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