The extended track interaction model: supralinearity and saturation He-ion TL fluence response in sensitized TLD-100

Horowitz, Y.S.; Satinger, D.; Oster, L.; Issa, N.; Brandan, M.E.; Ávila, O.; Rodríguez‐Villafuerte, M.; Gamboa‐deBuen, I.; Buenfil, A. E.; Ruiz‐Trejo, C.

doi:10.1016/s1350-4487(01)00033-6

Cited by 34 publications

(12 citation statements)

References 23 publications

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“…The TL fluence response of peaks 5a, 5 and 5b has been measured for 2.6 and 6.8 MeV He ions in both normal and sensitized LiF : Mg,Ti (TLD-100) [10,32]. The behaviour of the TL fluence response of peak 5a compared to peaks 5 and 5b strongly supports the geminate recombination model for peak 5a.…”

Section: He Ion Tl Fluence Response: Interpretation Using the Extendementioning

confidence: 60%

“…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%

“…For example, at n = 3 × 10 11 cm −2 , the normalized TL fluence response f (n) = 0.1 and 0.95 for peaks 5 and 5a, respectively. Analysis using the extended track interaction model (ETIM) resulted in the following values for the track radial saturation parameter; (r 50 ) 5a = 10 ± 2 nm, compared to (r 50 ) 5 = 38 ± 3 nm [32]. r 50 is the distance from the HCP track axis at which there is a 50% TC/LC occupation probability and it is expected that (r 50 ) 5a (arising from high ionization density) would be substantially smaller than (r 50 ) 5 .…”

Section: He Ion Tl Fluence Response: Interpretation Using the Extendementioning

confidence: 99%

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

Horowitz

Oster

Biderman

et al. 2003

J. Phys. D: Appl. Phys.

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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).

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Section: He Ion Tl Fluence Response: Interpretation Using the Extendementioning

confidence: 60%

Section: Non-linear Effects In the Tl Dose Responsementioning

confidence: 99%

Section: He Ion Tl Fluence Response: Interpretation Using the Extendementioning

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.

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show abstract

“…The conversion efficiency of peak 5, CE 5 , is similarly defined except that peak 5a intensities are replaced by peak 5 intensities. (ii) The lack of an increase in the sensitivity of glow peak 5a following 2.6 MeV and 6.8 MeV He ion irradiation in "sensitized" material compared to the factor two increase in the sensitivity of peak 5; (S/S 0 ) 5a = 0.86 ± 0.12, compared to (S/S 0 ) 5 = 2.0 ± 0.2 15 . Sensitization of peak 5 to gamma rays is obtained by gamma irradiation to a dose level of 1000Gy (believed to completely populate/deactivate the competing centres) followed by a 280 o C anneal for 30 minutes to depopulate peak 5 traps and "reset" the material or at least the low temperature trapping/recombination configurations.…”

Section: Resultsmentioning

confidence: 97%

The concept of quasi-tissue-equivalent nanodosimeter based on the Glow Peak 5a/5 in LiF:Mg, Ti (TLD-100)

Oster

Horowitz

Biderman

et al. 2003

Australas. Phys. Eng. Sci. Med.

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We demonstrate the viability of the concept of using existing molecular nanostructures in thermoluminescent solid-state materials as solid-state nanodosimeters. The concept is based on mimicking radiobiology (specifically the ionization density dependence of double strand breaks in DNA) by using the similar ionization density dependence of simultaneous electron-hole capture in spatially correlated trapping and luminescent centres pairs in the thermoluminescence of LiF:Mg,Ti. This simultaneous electron-hole capture has been shown to lead to ionization density dependence in the relative intensity of peak 5a to peak 5 similar to the ratio of double-strand breaks to single-strand breaks for low energy He ions.

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“…The sublinear/saturation behavior of TL intensity are discussed on the basis of track interaction model (TIM) [33,34]. According to this model the intensity.…”

Section: Thermoluminescencementioning

confidence: 99%

Luminescence properties of 100 MeV swift Si7+ ions irradiated nanocrystalline zirconium oxide

Lokesha

Nagabhushana

Singh

2015

Journal of Alloys and Compounds

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The extended track interaction model: supralinearity and saturation He-ion TL fluence response in sensitized TLD-100

Cited by 34 publications

References 23 publications

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

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

The concept of quasi-tissue-equivalent nanodosimeter based on the Glow Peak 5a/5 in LiF:Mg, Ti (TLD-100)

Luminescence properties of 100 MeV swift Si7+ ions irradiated nanocrystalline zirconium oxide

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