TRANSMISSION OF NEUTRON AND GAMMA-RADIATION FIELDS ALONG THE MAZE OF A CYCLOTRON VAULT

The neutron and gamma dose equivalent rates at various locations along the central plane of the four legged maze leading to the concrete vau lt of a 30 MeV Medical Cyclotron were measured. These measurements wer e performed during the bombardment of a water cooled aluminium target with a 30 MeV proton beam. The experimentally estimated neutron dose e quivalent rates along the distance of penetration into the maze were f itted explicitly with a set of exponential functions. These functions were utilised to optimise the maze design calculations of similar cycl otron target caves. (C) 1997 Elsevier Science Ltd.