Double Layer Collimator for BNCT Neutron Source Based on 30 MeV Cyclotron

Bilalodin Bilalodin (Department of Physics, Faculty of Mathematic and Natural Science, Jenderal Soedirman University)
Kusminarto Kusminarto (Department of Physics, Faculty of Mathematic and Natural Science, Gajah Mada University)
Arief Hermanto (Department of Physics, Faculty of Mathematic and Natural Science, Gajah Mada University)
Yohannes Sardjono (Centre for Accelerator Science and Technology, National Nuclear Energy Agency.)
Sunardi Sunardi (Department of Physics, Faculty of Mathematic and Natural Science, Jenderal Soedirman University)

Indonesian Journal of Physics and Nuclear Applications
Vol 2 No 3 (2017)

A research of design of double layer collimator using 9Be(p,n) neutron source has been conducted. The research objective is to design a double layer collimator to obtain neutron sources that are compliant with the IAEA standards. The approach to the design of double layer collimator used the MCNPX code. From the research, it was found that the optimum dimensions of a beryllium target are 0.01 mm in length and 9.5 cm in radius. Collimator consists of a D2O and Al moderator, Pb and Ni as a reflector, and Cd and Fe as a thermal and fast neutron filter. The gamma filter used Bi and Pb. The quality neutron beams emitted from the double layer collimator is specified by five parameters: epithermal neutron flux 1 ×109 n/cm2s; fast neutron dose per epithermal neutron flux 5 ×1013 Gy cm2s; gamma dose per epithermal neutron flux 1×1013 Gy cm2s; ratio of the thermal neutron flux of epithermal neutron flux 0; and the ratio of epithermal neutron current to total epithermal neutron 0.54.