| 摘 要： | Introduction With the development of reactor physics and computer, now, the covariance data become more and more important in the nuclear engineering applications. For evaluators and experimenters, the information are all given completely only in the case that the covariance matrix is given;because the error, as traditional, is only the diagonal elements of the covariance matrix, describes the accuracy of the data and nothing about the correlation of the data is given. There is the same situation in fission yield data, which are widely used in the radio decay heat calculation, burn-up credit study, radio intensity estimation of fission product and etc.
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