Soviet Physics Journal

, Volume 8, Issue 5, pp 106–108 | Cite as

Rational table of values of the radioactive decay function

  • V. Ya. Gavrik


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.


Decay Time Limited Range Residual Activity Initial Activity Activity Fraction 
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  1. 1.
    G. Ebert, Concise Physics Handbook [in Russian], Fizmatgiz, Moscow, 481, 1963.Google Scholar
  2. 2.
    V. Ya. Gavrik, Trudy Instituta fiziki LatvSSR, Riga, 10, 141, 1957.Google Scholar
  3. 3.
    V. Ya. Gavrik, Zavodskaya laboratoriya, 30, 2, 206, 1964.Google Scholar

Copyright information

© The Faraday Press, Inc. 1968

Authors and Affiliations

  • V. Ya. Gavrik
    • 1
  1. 1.Mozhaiskii Leningrad Red Banner Military Engineering AcademyUSSR

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