On energy absorption effects in uranium and thorium thin films

摘要

The use of U and Th thin films, attached to detectors of fSUsion tracks, allows determining the neutron fluence in nuclear reactors. In principle, the parameters involved in neutron fluence determinations through U and Th thin films that might be influenced by effects related with fSUsion fragments and a particle energy absorption are: (i) the detection efficiency of nuclear emulsions for x particles, (ii) the detection efficiency of muscovite mica for fSUsion fragments from thin films, F-epsilon and (iii) the detection efficiency of nuclear emulsions for fSUsion fragments, used to estimate F-epsilon. FSUsion fragments are more ionizing than alpha particles and are more influenced by energy absorption. We show that fSUsion fragment energy absorption effects are negligible in case of U and Th thin films employed in neutron fluence determinations for fSUsion-track (FT) dating.