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half life

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{n: half life, half-life} the time required for something to fall to half its initial value (in particular, the time for half the atoms in a radioactive substance to disintegrate)

{n: humic acid} a dark brown humic substance that is soluble in water only at pH values greater than 2
"the half-life of humic acid is measured in centuries"

{n: iodine-125} light radioactive isotope of iodine with a half-life of 60 days; used as a tracer in thyroid studies and as a treatment for hyperthyroidism

{n: iodine-131} heavy radioactive isotope of iodine with a half-life of 8 days; used in a sodium salt to diagnose thyroid disease and to treat goiter

{n: muon, negative muon, mu-meson} an elementary particle with a negative charge and a half-life of 2 microsecond; decays to electron and neutrino and antineutrino

{n: rubidium-strontium dating} geological dating based on the proportions of radioactive rubidium into its decay product strontium; radioactive rubidium has a half-life of 47,000,000,000 years

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