DIN 6871-2
DIN 6871-2 Cyclotron systems for positron emission tomography - Part 2: Radiation protection labyrinths and wall entrances
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 02/01/2005
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 02/01/2005