We're working on a problem where we need to compare the MCNP ex-core detector's count (subcritical system), in cps, to the real measured results. The thing is, after 50% (control rods withdrawals), we see the real results going higher than the ones from MCNP (check the comparison for one of ours detectors here in). Does anyone have any idea what is going on? The results from MCNP are being multiplied by the detector's sensibilities and also by the source particles.
Thanks in advance.
A BF3 detector under calibrating conditions is not exposed to a high gamma field.
Under calibrating and most exposure conditions gamma pulses are readily discriminated because gamma pulses are much smaller than neutron pulses. You may be seeing a case of summed gamma pulses exceeding the discrimination level. Does your MCNP simulation include gamma? Have made a detector simulation with an intense gamma flux?
I've considered only the thermal neutron fluxes at the detector's cells for the time being, with no gamma effect. These detectors we have here are quite old as well, so I'm not sure they have the same sensitivity as in the past. Anyway, I wish getting at least the same tendency comparing MCNP and the real count, but seems something is very wrong here.
Please, tell me something about the reactor? Is it energetic or research one?
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