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Wiktionary
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potassium-40
English
Noun
potassium
-40
(
uncountable
)
(
physics
)
A naturally-occurring
radioactive
isotope
of
potassium
,
40
19
K
, having nineteen
protons
and twenty-one
neutrons
, and a
half-life
of 1.3 billion years; it is the chief source of natural radioactivity in living tissue
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