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For nearly all practical purposes, dysprosium can be regarded as stable. There is a single naturally occurring radioactive isotope of dysprosium, but it is only 0.06% of what is found, and its half life is 1,000,000,000,000,000,000 years, so long it is very hard to measure. Like all other elements, dysprosium has synthetic radioactive isotopes.

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15y ago

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