Half-Life, Decay Constant, and Mean Lifetime On the other end of the spectrum we have Uranium-233 with a half-life of about 160 000 years. For example, on one end of the range we have carbon-8 with a half life of 2.0 x 10 −21 s (0.000000000000002 nanoseconds), so this isotope can only be observed if produced artificially. This particular quality also makes them a good source for random variation when generating true random numbers.ĭifferent elements can have vastly different half lives. Since it is a stochastic (random) process, the decay rate of a particular atom cannot be predicted, but it can be for a group of atoms of the same element and this is the basis of radiometric dating. Certain highly excited short-lived nuclear states can decay through neutron emission, or more rarely, proton emission. A material containing such unstable nuclei is considered radioactive. "nuclear decay", "radioactivity") is the process by which an unstable atomic nucleus loses energy (in terms of mass in its rest frame) by emitting radiation, such as an alpha particle, beta particle with neutrino or only a neutrino in the case of electron capture, gamma ray, or electron in the case of internal conversion. The half-life calculator results are accurate to the 16-th decimal and are usable in physics, chemistry, etc.
Months are approximated to 30.5 days, years are approximated to 365.2421 days. Supported units are nanoseconds, milliseconds, seconds, minutes, hours, days, weeks, months, and years. Our versatile radioactive decay calculator supports many different time units and automatically converts them if the time unit you measure the time elapsed is different than the time unit you enter the half-time, decay constant or mean lifetime in.
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