Dear FLUKA experts, This is the statement given in ICRP 144, 2020: “To reduce the variance of the Monte Carlo simulations, the uniform source was reproduced by increasing the number of photons or electrons emitted per unit area and decreasing the Monte Carlo weight of photons or electrons as their…

Dear Riya, the region importance biasing only applied during the transport of the particles, not for the source generation. It will only increase or decrease the particle weight. By default each primary particle starts with the weight of 1.0. What they did is to change the initial weight of the p…

Thank you so much @horvathd for this nice explanation. It is perfectly clear to me. Just to clarify, we can assign weight of primary particle using WTFLK (NPFLKA), right ? Also, can you please explain how this weight actually works here? I mean, at a time, one particle is transported in the simula…

Dear Riya, you are correct, the primary weight is set in the vaiable WTFLK (NPFLKA). The weight of a primary is used to normalize the results of the event as well. So if a 1 MeV photon with weight 0.5 deposits it’s total energy in a region, FLUKA will only score 0.5 MeV energy deposition for this…

Thank you @horvathd for the explanation. Regards, Riya

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