Abstract: By comparing the weighted mean values for experimental data with the recommended ones in a variety of small energy interval for the sets of reaction cross sections, a system of linear equations is proposed for determining the adjusted factors generated by corrections for the experimental data, which may be used to solve the covariance problems on the evaluated data with all physical corrections. The covariance matrices of some dosimetry reaction cross sections are calculated by this method.

Key words: evaluated data, recommended values, covariance matrix, adjusted factors