Rate of Radioactive Decay

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  The decay rate of uranium is usually given in inverse years rather than inverse minutes, an the result is k = 1.537 X 10^-10 yr^-1. This is a very slow rate of decay, but it is typical for naturally occurring radioactive materials.

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  Gamma decay is radioactive decay involving the emission of a gamma ray. 9. Competitive (beta^+, EC) is radioactive decay of a nuclide in which positron emission and electron capture both can occur. An example is the decay of Np-236.

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  DPM = -(dN/dt)=lN, where N=#of radioactive atoms present at any given time, l=decay constant; dN/dt=the number of atoms decaying per small increment of time (also known as "count rate") DPM = (1.01x10-15)*(4.74x1020)=4.81 x 105 DPM Therefore

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  Answer: The law of radioactive disintegration says that the activity of a sample (rate of disintegration per second) is directly proportional to the number of atoms present in the sample.