Simple shielding design method from medical and industrial electron accelerators

The neutron leakage from medical and industrial electron accelerators has become an important problem and its detection and shielding is being performed in their facilities. This study provides a new simple method of design calculation for neutron shielding of these electron accelerator facilities by dividing into the following five steps; 1) neutron dose distribution in the irradiation room, 2) neutron attenuation through the wall and the door between the irradiation room and maze, 3) neutron dose distribution in the maze, 4) neutron and secondary photon attenuation through the door at the maze exit, 5) neutron leakage outside the facility - skyshine. The accuracy of new simple method of design calculation for neutron shielding in medical and industrial accelerator facilities is investigated by comparing with the measured data in the actual facilities. From the comparison of measured and calculated neutron dose equivalents, it was confirmed that this simple design method has sufficiently good accuracy