Rational table of values of the radioactive decay function
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The change in activities with time can be simply determined over an unlimited range if instead of the half-life T0.5 one considers the time (period) corresponding to a decrease in the initial activity by one order, i.e., T0.1 = T0.5/lg 2 = 3.322. In this case the integer parts of the relative decay time t/T0.1 indicate the degree of tenfold reduction of the residual activity fractions found from a table (or nomogram) for their fractional parts.
In view of the ease with which the data can be extrapolated, the he table of fractional parts of t/T0.1, supplemented by a simple mechanical rule, is suitable for widespread use in physics manuals and textbooks in place of existing tables with a limited range of relative decay times and residual activity fractions.
KeywordsDecay Time Limited Range Residual Activity Initial Activity Activity Fraction
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