In the second simulation stage, the objective was to find the neutron energy and target material required to produce protons that meet the minimum requirements found in the previous step for producing Ac-225. Therefore, a neutron monoenergetic point source is placed at the center of a cylindrical neutron target. The neutron energy, cylinder material and its thickness are varied. For each run, the energy spectrum of the produced protons is recorded. The feasibility of each neutron energy, material type and thickness depend on the produced protons quantity and energy. Several materials were investigated, including Nickel (Ni), Iron (Fe), Potassium (K), Stainless-Steel (SS), Magnesium (Mg), and Manganese (Mn). The number of particles used in this stage was 108.

The Final Production Stage

The outcomes of the first and second stages form the basis of the third stage. The setup of the third stage comprises two cylinders: an inner and an outer cylinder. The inner cylinder acts as the neutron target. The neutron target composition and thickness are dependent on the outcomes of the second stage. The outer cylinder represents the proton target and is composed of RaCl₂ with the optimum thickness found in the first stage. At the center of the neutron target, a point neutron source is placed. All available neutron sources with energies meeting the criteria are used against this setup to find the probability of producing Ac-225 for each neutron source.