[DOC] [TLE] Half-life - Wikipedia [PAR] elapsed, Fraction remaining, Percentage remaining. 0, 1/1, 100. 1, 1/2, 50. 2, 1/4, 
25. 3, 1/8, 12 .5. 4, 1/16, 6 .25. 5, 1/32, 3 .125. 6, 1/64, 1 .563. 7, 1/128, 0 .781 ... ... 
... n, 1/2n, 100/(2n). Half-life (abbreviated t12) is the time required for a quantity to 
reduce to half its initial value. ... In other words, the probability of a radioactive 
atom decaying within its... [DOC] [TLE] Half-life | Define Half-life at Dictionary.com [PAR] Half-life definition, Physics. the time required for one half the atoms of a given ... 
required for the activity of a substance taken into the body to lose one half its ... 
the time taken for half of the atoms in a radioactive material to undergo decay  ... 
The time required for half the quantity of a drug or other substance deposited in a
... [DOC] [TLE] What is meant by half-life? - It's a Question of Physics - The Atomic ... [PAR] The half-life of a radioactive substance is a characteristic constant. It measures 
the time it takes for a given amount of the substance to become ... In the 
illustration above, 50% of the original mother substance decays into a new 
daughter substance. After two half-lives, the mother substance will decay another 
50%, leaving... [DOC] [TLE] Half-life | definition of half-life by Medical dictionary [PAR] The time required for half the quantity of a drug or other substance deposited in a 
... the time required for a radioactive substance to lose 50% of its activity through 
decay. .... half of a given amount of a substance that has been introduced into it. 
... n the average time required for the decay of half the atoms in a given amount of
... [DOC] [TLE] Rate of Radioactive Decay - Boundless [PAR] The time required for half of the nuclei in a sample of a specific isotope to ... The 
decay rate of a radioactive substance is characterized by the following constant 
quantities: ... of a given amount of a radioactive substance to decay to half of its 
initial value. ... The decay constant (, "lambda") is the inverse of the mean 
lifetime. [DOC] [TLE] Half-Lives and Radioactive Decay Kinetics - 2012 Book Archive [PAR] Another approach to describing reaction rates is based on the time required for 
the concentration of a reactant to decrease to one-half its initial value. ... 
Substituting [A] 0/2 for [A] and t 1/2 for t (to indicate a half-life) into Equation 14.27 
gives ..... In any sample of a given radioactive substance, the number of atoms of 
the... [DOC] [TLE] Chapter 3 - Radioactive Decay Kinetics The... - Oregon State ... [PAR] unstable radioactive nuclide into a more stable nuclide, which may also be 
radioactive, it is ... The half-life (t) is another representation of the decay 
constant. The half-life of a radionuclide is the time required for its activity to 
decrease by one-half. .... sample of N0 nuclei with lifetimes ti, we can write for 
the mean life . [DOC] [TLE] radioactivity - How does a half-life work? - Physics Stack Exchange [PAR] Mar 6, 2014 ... After another 5,730 years, a quarter of the original sample decays (and the ... no, 
this does not mean that the remaining carbon-14 atoms would be ... odds 
gradually add up to a cumulative decay probability of about 50%. .... Half-life (t) 
is the amount of time required for a quantity to fall to half its value as... [DOC] [TLE] Decay & Half Life Plexus-NSD - IEM Inc [PAR] Radioactive atoms decay principally by alpha decay, negative beta emission, ... 
These photons are pure energy given off by the nucleus in its process of ... The 
mass is converted into energy (do you recall Einstein's equation?!) and released

Question: It's defined as the time required for 50% of the atoms of a radioactive substance to decay into another substance
Answer: half-life