Estimation of primary radiation damage cross sections for iron

The primary damage in structural materials arises from an atomic displacement cascade which involves a number of collisions between the lattice atoms following the introduction of an energetic particle. Such cascade leads to the production of many point defects, which are vacancy- and/or interstitial-type defects. In estimating the amount of radiation damage, efforts have been made to find an alternative to the NRT model that accurately takes into account primary damage more and possibly improves damage correlation. In this respect, we investigated the primary radiation damage parameters on the basis of the NRT model, currently in use. Two damage parameters were taken into account from the NJOY system, which were displacement cross section and damage energy production cross section for iron. We suggest another primary radiation damage parameter, which is called net damage production cross section. This parameter will be derived by including the results of the MD cascade simulations. It is believed that this parameter will be useful for correlating damage mechanisms.