PENGOPTIMALAN PERISAI RADIASI NEUTRON DENGAN METODE PENELUSURAN GRADIENT MULTIDIMENSI

• Main Author: Hardi Priyanto, Tri
• Format: Theses
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/1889
• Institution: Institut Teknologi Bandung

Based on properties of neutron interaction with matter and multigroup neutron diffusion equation, a software for optimization of multilayer shielding is designed with multidimensional gradient searching method. The shielding consist of two kinds of materials with differed neutronic characteristics. Light materials (hidrogenous materials) are materials with high hidrogen densities which are useful for slowing down of high energy neutron (fast neutron) to low energy neutron (thermal neutron). On the other hand heavy materials are materials with large atomic number and high absorbtion cross section which are useful for thermal neutron capture. With assumption that every layer consist of one mesh placed in the interior, the software is designed to get optimal composition ratio between heavy materials and light materials at every layer so that neutron leakage at the shielding surface is minimum. From the shielding design calculation with slab geometry, thik near 0,5 m. Source neutron intensity 1x1014 n/cm2det. Weighting c o e R for fast neutron, intermediate neutron, and thermal neutron are equals to 0. 8, 0.16 and 0.04, respectively. The optimal ratio of the materials composition for every layer are obtained which gives the minimum neutron leakage.