The Unified Interaction Model Applied to LiF:Mg,Ti (TLD-100): Properties of the Luminescent and Competitive Centers during Sensitisation

Nail, I.; Horowitz, Y.S.; Oster, L.; Biderman, S.

doi:10.1093/oxfordjournals.rpd.a006098

Cited by 18 publications

(12 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the LT model all trapped carriers will recombine with adjacent RCs at an appropriately high temperature. However, we can enrich the model by adding the possibility of separation of trapped hole-electron pairs in a way similar to that for the most popular LiF : Mg, Ti detector: for example, Nail et al [14] and Horowitz et al [15] considered that only peak 5a relates to the geminate recombination (i.e. the LT).…”

Section: The Model Of Sltsmentioning

confidence: 99%

Semi-localized transitions model for thermoluminescence

Mandowski¹

2004

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

A new model for thermoluminescence (TL) kinetics is presented, which is a natural generalization of the standard localized transition model. The model of semi-localized transitions (SLTs) allows trapped charge carriers to be excited to the conduction band. Analytic equations for SLTs are constructed using an enumeration technique which transforms concentrations of carriers to concentrations of states of localized trap-recombination centre pairs. Solving numerically the set of equations, we demonstrate some basic features of the SLT model. It is shown that SLT is able to produce so-called TL displacement peaks that were previously found in one-dimensional TL simulations.

show abstract

Section: The Model Of Sltsmentioning

confidence: 99%

Semi-localized transitions model for thermoluminescence

Mandowski¹

2004

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…• The lack of constraints (e.g. early or late entry into saturation) on the dose-dependence of the competitor required to explain the supralinearity of peak 5 [31]. It is demonstrated that the competitor need not enter into early saturation in order to promote supralinearity.…”

Section: Non-linear Effects In the Tl Dose Responsementioning

confidence: 99%

“…The basic idea of the UNIM is that the linear response at low dose arises from geminate recombination in a localized entity. For gamma rays and electrons, the localized entity is the coupled/spatially correlated TC/LC pair [22,[30][31][32]. Note that the supralinearity is not present in LiF : Mg,Cu,P (a linear/saturating dose response is observed- figure 14) due to the absence of Ti and, consequently, the lack of formation of the TC/LC coupled pairs.…”

Section: Non-linear Effects In the Tl Dose Responsementioning

confidence: 99%

“…• The dependence of the supralinearity on ionization density (gamma ray/electron energy) [11,22,30,31] due to an energy dependent variation in the relative number of geminate recombination processes (not subject to competition) and CB mediated processes (subject to competition). This arises due to a dependence on ionization density on the relative number of electron/hole occupied TC/LC complexes following irradiation (configuration I in figure 8).…”

Section: Non-linear Effects In the Tl Dose Responsementioning

confidence: 99%

See 1 more Smart Citation

Localized transitions in the thermoluminescence of LiF : Mg,Ti: potential for nanoscale dosimetry

Horowitz

Oster

Biderman

et al. 2003

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

We describe the effect of nanoscale spatially coupled trapping centre (TC)-luminescent centre (LC) pairs on the thermoluminescence (TL) properties of LiF : Mg,Ti. It is shown that glow peak 5a (a low-temperature satellite of the major glow peak 5) arises from localized electron-hole (e-h) recombination in a TC-LC pair believed to be based on Mg 2+-Li vac trimers (the TCs) coupled to Ti(OH) n molecules (the LCs). Due to the localized nature of the e-h pair, two important properties are affected: (i) heavy charged particle (HCP) TL efficiency: the intensity of peak 5a relative to peak 5 following HCP high-ionization density irradiation is greater than that following low ionization density irradiation in a manner somewhat similar to the ionization density dependence of the yield of double-strand breaks (DSBs) induced in DNA. Our experimental measurements in a variety of HCP and fast neutron radiation fields have demonstrated that the ratio of glow peaks 5a/5 is nearly independent of particle species for the protons, deuterons and He ions investigated, is somewhat dependent on HCP energy, and is roughly 2-3 times greater than the peak 5a/5 ratio in low ionization density electron and photon fields. The intensity ratio of peak 5a/5 thus has the potential of estimating the ratio of dose deposited via high ionization density interactions compared to low ionization density interactions in a nanoscale volume without any prior knowledge of the characteristics of the radiation field, (ii) non-linear TL dose response: the relative lack of competitive processes in the localized recombination transitions leading to the TL of composite peak 5 versus the dose-dependent competitive processes in conduction band-mediated delocalized luminescence recombination leads to non-linear dose response (supralinearity) for composite peak 5 and a dependence of the supralinearity on ionization density. This behaviour is modelled in the framework of the unified interaction model (UNIM).

show abstract

“…After several decades of investigation, the following salient features of OA in LiF:Mg,Ti have emerged: There are eleven clearly identifiable optical absorption bands spanning the energy range from 2.84 eV to 10.97 eV (Nail et al, 2002). Of these, only two bands have been convincingly correlated with TL trapping centers (TCs); the intense 4.0 eV band with composite peak 5 and the 3.24 eV OA band with peaks 2 and 3 which have been attributed to (Mg-Li vac ) trimers and dipoles respectively (McKeever, 1984).…”

Section: Introductionmentioning

confidence: 99%