Radioactive decay, also known as nuclear decay or radioactivity, is a random process by which an unstable atomic nucleus loses its energy by emission of radiation or particle. A material containing unstable nuclei is considered radioactive.
adjective(Physics), obsoleteCapable of luminescence under the action of cathode rays, X rays, or any of the allied forms of radiation. adjective(Physics)of, exhibiting, or caused byradioactivity. fromWiktionary, Creative Commons Attribution/Share-Alike License. ...
(6.3-13) and the definition (6.1-9) that the stepping functions for the radioactive decay process are given by (6.3-14)W+(n) = 0 and W−(n) = (1/τ*)n. By substituting these formulas into the general birth-death forward master equation (6.1-17)...
decay of radium. This can be highly available in well waters, where its concentration is limited insurface waters. Tritium (3H) is a natural isotope produced by cosmic rays and is generally available in surface waters in very few concentrations due to its short half-life time (Tims et al....
In a manner of speaking, no. Radioactive elements lose their radioactivity only through the passage of time and the process of radioactive decay. Many non-radioactive substances, on the other hand, can be treated in a variety of chemical, physical, or biological ways to reduce their “toxici...
If radioactive decay is the dominant process causing reduction/change in tracer concentration, timetrepresents the ‘groundwater age’ (Cook and Böhlke, 2000). It corresponds to the time that has elapsed since the water became isolated from the Earth's atmosphere, i.e., the time elapsed ...
The decay process terminates with the release of stable, nonradioactive isotopes such as 206Pb and 207Pb. The isotopes such as 232, 233, 236 U are the artificial isotopes of uranium that can be produced in reactors by a simple neutron capture by a nucleus of 235U and thorium (e.g., ...
A decay in the Fisher information is equivalent to convergence to stability. This criterion is the Lyapunov stability criterion with the Fisher information as the Lyapunov function [43]. A definition of the Glandsdorff–Prigogine stability measure is the time derivative of the Fisher information [43...
A new model for the dilation of brittle rocks based on laboratory compression test data with separate treatment of dilatancy mobilization and decay. Geotech. Geol. Eng. 2015, 33, 661–679. [Google Scholar] [CrossRef] Diederichs, M.S.; Kaiser, P.K.; Eberhardt, E. Damage initiation and ...