Effective half-life

Effective half-life denotes the halving of radioactive material in a living organism by means of radioactive decay and biological excretion. A decay constant is needed to calculate the half-life. It is the sum of the biological and physical decay contants, as in the formula: :$\{\backslash lambda\_e\}\; \backslash ,\; =\; \{\backslash lambda\_p\}\; \backslash ,\; +\; \{\backslash lambda\_b\}\; \backslash ,$ With the decay constant it is possible to calculate the effective half-life using the formula: :$t\_\{1/2\}\; =\; \backslash frac\{\backslash ln\; 2\}\{\backslash lambda\_e\}\; \backslash ,$ The biological decay constant is often approximated as it is more difficult to accurately determine than the physical decay constant. ==External Links== [http://hyperphysics.phy-astr.gsu.edu/hbase/nuclear/biohalf.html Biological Half-life]

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