Geant4 Simulations for the Radon Electric Dipole Moment Search at

3.6.2 Output Data and Sort Codes
The simulated data, described in Section 3.2.5, was written to binary files. The
binaryfilesweresortedtogeneratespectraandmatricesfiles. Theenergyresolutionof
the detectors was modelled during the sorting process, since the statistical variations
and electronic effects that give rise to the resolution can not be modelled directly by
Geant4 . The energies output from Geant4 were idealized, within 1 keV bins. To
facilitate a comparison between experiment and simulation, a resolution function was
applied, specific to the detector type.
The relationship between the square of the full-width at half-maximum (FWHM)
and γ-ray energy was determined for each detector by fitting a second order polynomial.
These coefficients for the TIGRESS/GRIFFIN detectors were previously
calculated and verified [35] and are shown in Figure 3.8(b). The coefficients for the
BrilLanCe380detectorswerefittoperformancemeasurementsgivenbySaint-Gobain.
Figure 3.8(a) illustrates the measurements and the derived fit. The energy resolution
values derived from these functions were converted into standard deviations, and applied
to the idealized energies. The resulting energies were chosen from a Gaussian
distribution with the idealized energy as the mean [35].
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