Definition:Radioactive Decay/Radioactive Element
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Definition
A chemical element whose isotopes are all subject to radioactive decay is known as a radioactive element.
Half-Life
The half-life of a radioactive isotope is the time it takes for exactly half of an arbitrary quantity of that isotope to undergo radioactive decay.
Thus it is the time it takes for exactly half of an arbitrary quantity of that isotope to remain.
Sources
- 1972: George F. Simmons: Differential Equations ... (previous) ... (next): $1$: The Nature of Differential Equations: $\S 4$: Growth, Decay and Chemical Reactions