Comparison of Photonuclear Data Files Used in Shielding Calculation of a Medical Linac Room

It is necessary to consider the effect of photoneutrons produced by photonuclear reactions in shielding calculation a medical linac room with incident electron greater than 10 MeV. For copper and tungsten used as target materials linac, we compared experimental data evaluated four reaction files photoneutron production cross sections. We also calculated results using on angular distributions emitted from targets bombarded 18 28 MeV electrons. Consequently, found that calculations LA150 JENDL/PD-2016.1 gave dose rates within factor 1.5 accuracy energy less