mean life

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mean life

In radioactivity, the average lifetime of all the nuclei of a particular unstable atomic species. This time interval is the sum of the lifetimes of all the individual unstable nuclei in a sample, divided by the total number of unstable nuclei present. It is the reciprocal of the decay constant. For a given isotope, the mean life is always 1.443 times its half-life. For example, lead-209 decays to bismuth-209 with a half-life of 3.25 hours and a mean life of 4.69 hours.

mean life [′mēn ′līf]

(physics)

The average time during which a system, such as an atom, nucleus, or elementary particle, exists in a specified form; for a radionuclide or an excited state of an atom or nucleus, it is the reciprocal of the decay constant. Also known as average life; lifetime.

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No references found			It will mean life more abundant for the manhood of the young boys born and growing up--ay, and life more abundant for the young girls born and growing up to share the lives of the young men. John Barleycorn by London, Jack View in context I perceive that we inhabitants of New England live this mean life that we do because our vision does not penetrate the surface of things. Walden & on the Duty of Civil Disobedience by Thoreau, Henry David View in context			mean British thermal unit mean calorie mean camber line mean carrier frequency mean chart mean chord Mean Curvature mean depth mean deviation mean difference mean diurnal high-water inequality mean diurnal low-water inequality Mean Downtime mean draft mean effective pressure mean evolute Mean Free Path mean gradient mean height of burst mean high water mean high-water lunitidal interval mean high-water neaps mean high-water springs mean higher high water mean latitude mean life mean low water mean low-water lunitidal interval mean low-water neaps mean low-water springs mean lower low water mean lower low-water springs mean map Mean Motion mean neap range mean neap rise Mean Noon mean normal stress mean place mean point of impact mean point of impact error Mean Position mean power mean pressure mean profile Mean Proportional mean range mean rank method mean rise interval mean rise of tide mean river level			mean integrated squared error Mean Inter-Intromission Interval Mean Interstitial Bone Thickness Mean Interval Free Time Mean January Temperature Mean Johnsen's Score Count Mean Joint Space Width Mean Kilometer Between Failure Mean Lactulose/Mannitol Mean Laryngeal Reaction Time Mean Latency of Eye Movements mean latitude Mean Launch Power Mean Layer CAPE mean lean times Mean Left Ventricular Diastolic Pressure Mean Left Ventricular Pressure Mean Left Ventricular Systolic Pressure Mean Left-Right Position Mean length of utterance Mean Length of Utterance in Morphemes mean lethal dose Mean Level Mean Level Detector mean life Mean Life Between Failures Mean life span Mean life span Mean life span Mean life span Mean lifespan Mean lifespan Mean lifespan Mean lifespan Mean lifetime Mean lifetime Mean lifetime Mean Lifetime Between Failures Mean line mean line of advance mean line of advance Mean Load Between Failure Mean Loadcycles Between Failure Mean Loads Between Failure Mean Local Blood Pressure Mean Local Time Mean Local Time of Ascending Node Mean Local Time of Descending Node Mean Log Bigram Frequency Mean Logistics Delay Time Mean Logistics Down Time Mean Loss per Test Point Mean Low Gulf mean low tide Mean Low Water

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