halflives
Decay time measures
Halflives is the plural of half-life, the time required for half of a radioactive substance to decay, or for a drug's concentration in the body to reduce by half: Different isotopes have vastly different halflives.
Figuratively, it describes how long something remains relevant or effective: Political scandals have shorter halflives now.
Element ninety-two
- plutoniumActinide, atomic number 94
- radiumRadioactive alkaline earth metal
- thoriumActinide, atomic number ninety
- carbon-14Radioactive isotope for dating
iodine-131 · cesium-137 · strontium-90 · radon · tritium · cobalt-60 · polonium · americium
Process of breaking apart
- transmutationComplete change of form
- radioactive decayUnstable atoms releasing energy
- exponential decayProportional decrease over time
- instabilityTendency toward unpredictable change
metastable · emission · nucleus · neutron · proton · fission · alpha · beta
Isotope-based age measurement
- radiocarbon datingDetermining age via isotope decay
- archaeologyStudy of physical remnants
- geologyStudy of Earth's composition
- nuclear medicineHealthcare using radioactive materials
radiotherapy · tracers · diagnostics · geochronology · pharmacokinetics · elimination · metabolic · clearance
Time units, or extras
- minutesSixty-second intervals
- hoursSixty-minute spans
- daysTwenty-four-hour spans
- yearsTwelve-month spans
centuries · millennia · nanoseconds · milliseconds · calibration · quantification · exponential · logarithmic
uranium
Element ninety-two
- plutoniumActinide, atomic number 94
- radiumRadioactive alkaline earth metal
- thoriumActinide, atomic number ninety
carbon-14 · iodine-131 · cesium-137 · strontium-90 · radon · tritium · cobalt-60 · polonium · americium · neptunium
disintegration
Process of breaking apart
- transmutationComplete change of form
- radioactive decayUnstable atoms releasing energy
- exponential decayProportional decrease over time
instability · metastable · emission · nucleus · neutron · proton · fission · alpha · beta · gamma
carbon dating
Isotope-based age measurement
- radiocarbon datingDetermining age via isotope decay
- archaeologyStudy of physical remnants
- geologyStudy of Earth's composition
nuclear medicine · radiotherapy · tracers · diagnostics · geochronology · pharmacokinetics · elimination · metabolic · clearance · drug metabolism
seconds
Time units, or extras
years · centuries · millennia · nanoseconds · milliseconds · calibration · quantification · exponential · logarithmic · calculation
halfliveseternities
Boundless time periods
permanence · timelessness · infinity · perpetuities · lifespans
halflivesstability
Resistance to displacement
permanence · constancy · immutability · persistence · stasis
halfway, halfhearted, halftime, halfback, halfpenny, half-life, halftone, halberd, halflife