halflife
Radioactive decay measure
The halflife of a radioactive substance is the time required for half its atoms to decay.
Plutonium-239 has a halflife of 24,000 years; radon-222, less than four days.
The concept extends to anything that diminishes exponentially: the halflife of a drug in the bloodstream, the halflife of a celebrity's fame.
Also spelled half-life.
Gradual organic breakdown
- isotopeElemental variant by mass
- uraniumElement ninety-two
- plutoniumActinide, atomic number 94
- radioactiveEmitting nuclear decay particles
radiation · carbon-14 · cesium-137 · strontium-90 · cobalt-60 · radon · thorium · exponential decay
Game studio and storefront
- SteamDigital game distribution service
- crowbarMetal prying lever
- CombineJoin into one
- ApertureDefunct Apple photo software
Lambda · gravity gun · strider · barnacle · antlion · resistance · modding · speedrun
Speed of deterioration
- exponentialIncreasing by constant ratio
- degradationDecline in condition
- eliminationAct of removing entirely
- clearancePermitted passage or approval
pharmacokinetics · drug metabolism · persistence · dissipation · attenuation · diminishing · residual · trace
decay
Gradual organic breakdown
radioactive · radiation · carbon-14 · cesium-137 · strontium-90 · cobalt-60 · radon · thorium · exponential decay · disintegration
Valve
Game studio and storefront
Aperture · Lambda · gravity gun · strider · barnacle · antlion · resistance · modding · speedrun · FPS
decay rate
Speed of deterioration
- exponentialIncreasing by constant ratio
- degradationDecline in condition
- eliminationAct of removing entirely
clearance · pharmacokinetics · drug metabolism · persistence · dissipation · attenuation · diminishing · residual · trace · lingering
halflifestability
Resistance to displacement
permanence · inertness · steady state · equilibrium · conservation
halflifeeternity
Boundless temporal existence
permanence · infinity · perpetuity · timelessness · forever
halflifedoubling time
Time to grow twofold
growth rate · exponential growth · buildup · accretion · amplification
life, half, halfway, lifetime, lifelong, lifespan, halving, halftime, lifetimes