“…This process is known as the "rigorous 2-step method" or R2S method. Different organizations have developed their own methods combining MCNP4 and FISPACT [5,6], later MCNP5 [7,8] and also MCNP5 and ACAB [9]. Other simplified alternative is the manipulation of the cross-section library to treat the prompt gamma production as activated isotope production, called D1S method [10][11][12].…”