Neutron Response Functions for a Gold Foil NNS

Neutron Response Functions for a Gold Foil NNS is a Monte-Carlo simulation application based on GEANT4 to generate the system response functions of a passive Nested Neutron Spectrometer (NNS) using gold foil.

The passive gold-foil NNS consists of seven cylindrical HDPE moderator shells and a passive thermal neutron detector; gold-foil in this case. The gold foil is positioned at the geometrical centre of the moderators in a horizontal disposition using two cylindrical inserts. This spectrometer can be used to measure the neutron flux spectra but the spectrometer response functions are essential to unfold the neutron flux spectra from the measurements. This application will enable the passive NNS user to generate the system response functions.

Publications describing this code include:

• Felix Mathew, Cornelia Chilian, Logan Montgomery, John Kildea (2021). Development of a passive gold-foil Nested Neutron Spectrometer to validate the active current-mode He-3 measurements in a high neutron fluence rate radiotherapy environment. In Nuclear Instruments and Methods in Physics Research.