1.(General Physics) the time taken for half of the atoms in a radioactive material to undergo decay. Symbol:τ 2.(Biology) the time required for half of a quantity of radioactive material absorbed by a living tissue or organism to be naturally eliminated (biological half-life) or removed...
half-life n 1.(General Physics) the time taken for half of the atoms in a radioactive material to undergo decay. Symbol:τ 2.(Biology) the time required for half of a quantity of radioactive material absorbed by a living tissue or organism to be naturally eliminated (biological half-life...
Physics. the time required for one half the atoms of a given amount of a radioactive substance to disintegrate. Also called bi·o·log·i·cal half-life [bahy, uh, -, loj, ik, uh, l , haf, -lahyf]. Pharmacology. the time required for the activity of a substance taken into the ...
Physics.the time required for onehalfthe atoms of a given amount of a radioactive substance to disintegrate. Also calledbi·o·log·i·cal half-life[bahy, uh, -, loj, ik, uh, l , haf, -lahyf].Pharmacology.the time required for the activity of a substance taken into the body to lo...
half-life (haf'līf), The period in which the radioactivity or number of atoms of a radioactive substance decreases by half; similarly applied to any substance, such as a drug in serum, whose quantity decreases exponentially with time. Compare:half-time. ...
Seehalf-lifein the Oxford Advanced American DictionarySeehalf-lifein the Oxford Learner's Dictionary of Academic English Check pronunciation:half-life 我们重视您的隐私 我們及我們的782合作夥伴會在您的裝置上儲存和存取個人資料,例如瀏覽資料或唯一識別碼。選擇「接受」將啟用追蹤技術,以支持「我們及合作夥伴處...
stable. By knowing the decay rate of carbon-14 (it has a half-life of 5,730 years), and measuring how much of the carbon-14 in the sample has transmuted into other elements relative to the amount of carbon-12, then it is possible to determine the ages of fossils and similar objects...
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Half-life, in radioactivity, the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay, or, equivalently, the time interval required for the number of disintegrations per second of a radioactive material to decrease