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IEVref: | 395-01-11 | ID: | |

Language: | en | Status: Standard | |

Term: | decay constant | ||

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Synonym2: | |||

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Symbol: | λ
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Definition: | disintegrations per unit time dN/dt for an atomic nucleus divided by the number of nuclei N existing at the same time t $\lambda =-\frac{1}{N}\times \frac{\text{d}N}{\text{d}t}$ Note 1 to entry: The decay constant is expressed in reciprocal seconds (s Note 2 to entry: The decay constant may be considered the total probability of radioactive decay (disintegration and/or nuclear transition). Note 3 to entry: This entry was numbered 393-14-18 in IEC 60050-393:2003. | ||

Publication date: | 2014-03 | ||

Source: | ISO 921:1997, definition 282, modified | ||

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Internal notes: | 2015-05-20: Link added to <a href=IEV113-05-21>atomic nucleus</a>. JGO | ||

CO remarks: | |||

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VT remarks: | |||

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$\lambda =-\frac{1}{N}\times \frac{\text{d}N}{\text{d}t}$

Note 1 to entry: The decay constant is expressed in reciprocal seconds (s^{−1}).

Note 2 to entry: The decay constant may be considered the total probability of radioactive decay (disintegration and/or nuclear transition).

Note 3 to entry: This entry was numbered 393-14-18 in IEC 60050-393:2003.