Evaluation of Neutron Capture Cross Sections and Covariances on⁹⁹Tc and¹²⁹I in the keV Energy Region

Abstract

Abstract. Neutron capture cross sections and covariances on radioactive 99 Tc and 129 I have been required for developing environmental load-reducing technology. Their evaluation was performed by using nuclear reaction calculation code CCONE and Baysian code KALMAN with data assumed on the basis of measured data. The obtained total and capture cross sections are in good agreement with the measured data. The resulting uncertainties of capture cross section were 12-18% and 20-29% for 99 Tc and 129 I, respectively, in the keV energy region.