Unfolding the response of a Ge detector used for in-situ gamma-ray spectrometry

Efficient in situ method to determine radionuclide concentration in soil

“…In this work we have postulated the distribution of activity to be described by the functions (9) or (10). For the Lorentz function (9) we have used the correlation of parameters determined by Hillman et al [14], which for 137 Cs contamination in soil were given by…”

“…Taking into account that the detector response as a rule varies (almost) monotonically with the angle of incidence between 01 and 901 [2,[9][10][11] the spectrum, P 0 (E,E 0 ), should preferable be recorded at an intermediate angle. This point will be discussed further in Section 6.…”

In situ gamma-spectrometry several years after deposition of radiocesium

“…The detector response was calculated by Monte Carlo simulations of photon and electron transport [15]. For this purpose a geometrical model of the detector was created and utilized to calculate a set of response functions for monoenergetic photons with energies ranging from 20 keV to 2.62 MeV and with isotropic incidence.…”

“…The calculations were made in steps of 10 keV for primary photon energies, and the energy deposition events were distributed in energy bins with a width of 10 keV. The simulations were performed with the code EGS4 [16], which accounts for coherent photon scattering, electron transport and creation of bremsstrahlung, which is especially important for photon energies above 1.5 MeV [15]. In the simulations, photon histories were followed down to energies of 5 keV, electron histories down to 100 keV.…”

Unfolding Low-Energy Gamma-Ray Spectrum Obtained with NaI(Tl) in Air Using Matrix Inversion Method

“…The inverse matrix method [1][2][3] represents the most straightforward method. The stripping method [4][5][6][7][8] is often applied for Ge detector and is based on a successive subtraction of Compton background from higher to lower channels. The folding iteration method [9][10][11][12][13][14] is based on successive folding of better and better trial functions.…”