Energy dependence of the supralinearity (f(D)max) of peaks 7 and 8 in the high temperature thermoluminescence of LiF:Mg,Ti (TLD-100): Interpretation using the unified interaction model

摘要

It is demonstrated that the supralinearity of the dose response of glow peaks 7, 8 in the glow curve of LiF:Mg,Ti (TLD-100) are very strongly dependent on photon/electron energy. Previously published data on f(D)_(max) at photon energies of 1.25 MeV, 100 keV and 8.1 keV effective energy coupled with new data at ～ 540 keV using ~(90)Sr/~(90)Y beta rays reveals that the maximum supralinearity f(D)_(max) decreases from values of ～200 and ～30 at 1.25 MeV, through intermediate values at 540 keV and 100 keV, to values of ～ 30 and ～3 at 8.1 keV effective energy. The normalized dose response f(D) for all energies is modeled using the Unified Interaction Model and the dependence of f(D)_(max) on energy is interpreted as arising from strong dependence of the relative intensity of localized recombination on particle energy (ionization density).