Within the Decay Data Evaluation Project, as an example of a radioactive equilibrium with isomer, the Mo-99/(99)mTc equilibrium mixture decay characteristics are examined. The results of a new decay data evaluation are presented for Mo-99/(99)mTc decay to nuclear levels in Tc-99. These evaluated data have been obtained using information published up to 2013. (C) 2013 Elsevier Ltd. All rights reserved.