This document shows the development of the induced activity estimation method and confirmation of the accuracy of this method for activated concrete estimation. As a result of comparison, the calculated value to the measured value (C/E) for ⁶⁰Co was about 1.7 and the C/E for ¹⁵²Eu was about 0.9. According to the comparison, it was shown that the calculated activity for ⁶⁰Co was moderately conservative and ¹⁵²Eu was in good agreement.