Dear @Motlatsi_Vincent,
in your input file you submitted in the other thread dose-rate-from-activation-simulation you simulate dose rate only after the neutron irradiation has terminated, with decay times of 1 hour and 5.27 years (you probaby expect to see a halving of the dose rate between the first and the second case). After a decay time, there are simply no more neutrons left! (*)
Without decay times, you correctly see neutrons in your scoring volumes.
(*) neutrons have a lifetime of 880 seconds, and you could think that you would score some of the primary neutrons if you define a decay time of 1 second in an activation calculation. This is not the case because only decay radiations from the created radionuclides are tracked in this type of simulation.