Recent progress in emulsion technology to study fragmentation reactions of high energetic ion beams

The R&D project to study nuclear fragmentation using emulsion in attempt to improve the accuracy of dose calculation in carbon ion radiotherapy has been carried out at NIRS-HIMAC since 2003. Based on the developed techniques, we are accumulating experimental data of fragmentation reactions for various beams and target combinations. In this program we are also developing the practical application of hybrid apparatus of emulsion and CR-39 and performing basic study of gold deposition development in order to improve measurement of ionization.