Abstract. In order to find out the most suitable model that describe neutron survival curves data, we used MAT-LAB facility programs to extract the neutron survival curves data from literature and fitting them to four survival curves models: The single-hit single-target (SHST) model and the linear quadratic equation (LQ) which both are classical models, and the inducible repair model (IR) and the Repairable Conditionally Repairable model (RCR) which both takes into account the recently discovered hypersensitivity phenomena. The classical models failed to describe neutron survival curves, whereas the Inducible Repair model (IR) was successful to a certain extent and the RCR was most successful in fitting the data Fitting analysis suggests that a hypersensitivity phenomena is present in old neutron data and needs to be investigated.

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