| Summary: | Calibrations of neutron devices used in area monitoring are often performed
by radionuclide neutron sources. Device readings increase due to neutrons
scattered by the surroundings and the air. The influence of said scattering
effects have been investigated in this paper by performing Monte Carlo
simulations for ten different radionuclide neutron sources inside several
sizes of concrete wall spherical rooms (Rsp = 200 to 1500 cm). In order to
obtain the parameters that relate the additional contribution from scattered
neutrons, calculations using a polynomial fit model were evaluated. Obtained
results show that the contribution of scattering is roughly independent of
the geometric shape of the calibration room. The parameter that relates the
room-return scattering has been fitted in terms of the spherical room radius,
so as to reasonably accurately estimate the scattering value for each
radionuclide neutron source in any geometry of the calibration room.
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