Technetium decay constant

The nucleus Tc is a metastable nucleus of technetium-99 it is used in medical diagnostic work. Technetium-99/w decays by emitting ganama rays. A 2.5-fig (microgram) sample has an activity of 13 Ci. What is the decay constant (in units of /s) ... 

Technetium-99m is used to form pictures of internal organs in the body and is often used to assess heart damage. The m for this nuclide indicates an excited nuclear state that decays to the ground state by gamma emission. The rate constant for decay of Tc is known to be 1.16 X 10 Vh. What is the half-life of this nuclide ... 

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