radioactive decay

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radioactive decay

the disintegration of the nucleus of an unstable nuclide by the spontaneous emission of charged particles, photons, or both.

radioactive decay

The continual loss of energy by radioactive substances. Disintegration of the nucleus by the emission of alpha, beta, or gamma rays eventually results in the complete loss of radioactivity. The time required for some materials to become stable may be minutes and, for others, thousands of years.
See: half-life
See also: decay

radioactive

characterized by radioactivity.

radioactive decay
spontaneous decomposition of the nuclei of the atoms of radioactive substances. Measured as the proportion of the atoms in a radionuclide that decompose per unit of time, usually stated as the half-life of that particular isotope.
radioactive fallout
dissemination of radioactive substances through the atmosphere and deposition on the environment generally; causes radiation injury.
radioactive isotope
radionuclide. A radioactive nuclide, e.g. radioactive iodine or strontium.
radioactive tracer
see radioactive tracer.
References in periodicals archive ?
Differential nuclear decay rate is simply described by the rate equation dN(t)/dt = -N(t)[lambda]'.
Racke, Sharp decay rates in parabolic and hyperbolic thermoelasticity, IMA J.
Results of the ANOVA revealed significant differences in decay rates between health authorities in 2006/07 ([F.
The Results section will begin with a discussion of the decay rate r as it relates to Knight's quotation (2004, 1351) given in the previous section.
In 2012, they treated 16,000 kids, and reports have indicated a steady drop in decay rates.
For the study of the time dependent decay rate of B-meson, an interesting approach (35) was proposed.
1 gives conditions in terms of linear matrix inequalities for the [alpha]-exponential stability problem for each given decay rate [alpha] > 0 as considered in [4-6,12,15].
More advanced students can calculate the decay rate coefficient and test for significant differences using parametric statistics (see Minshall & Rugenski, 2007).
6] [ohm], and decay rate from 5,000 V to <50 V in less than 0.
The decay rate of these material is decreased due to the tow oxygen conditions, which in turn allow the carbon to collect in the soil.
To investigate the applicability of the proposed ACO technique, it has been applied to study the case study network, the influence of number of ants (n), the decay rate (p), visibility parameter ([gamma]) and numerical parameter (Q) are investigated.
The issue of the dependence of the decay rate or, more generally, the stabilizability properties with respect to this singular parameter is also an interesting subject that has been the object of intensive research.