Ionisation Density Effects in the Thermoluminescence of TLD-100:Computerised Tm-Tstop Glow Curve Analysis

Horowitz, Y.S.; Satinger, D.; Yossian, D.; Brandan, M.E.; Buenfil, A. E.; Gamboa‐deBuen, I.; Rodríguez‐Villafuerte, M.; Ruiz, C. G. Tavera

doi:10.1093/oxfordjournals.rpd.a032727

Cited by 52 publications

(18 citation statements)

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“…This behaviour can be interpreted as due to an increased intensity of peak 5a relative to peaks 4 and 5 following HID irradiation. The deconvolution analysis into component glow peaks shown in Figure 13 is based on this hypothesis and is supported by T m 2T stop measurements (26) .…”

Section: The Shape Of Composite Peak 5 As a Function Of Hcp Type And supporting

confidence: 58%

Mysteries of LiF TLD response following high ionisation density irradiation: nanodosimetry and track structure theory, dose response and glow curve shapes

Horowitz

Fuks

Datz

et al. 2010

Radiation Protection Dosimetry

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Three outstanding effects of ionisation density on the thermoluminescence (TL) mechanisms giving rise to the glow peaks of LiF:Mg,Ti (TLD-100) are currently under investigation: (1) the dependence of the heavy charged particle (HCP) relative efficiency with increasing ionisation density and the effectiveness of its modelling by track structure theory (TST), (2) the behaviour of the TL efficiency, f(D), as a function of photon energy and dose. These studies are intended to promote the development of a firm theoretical basis for the evaluation of relative TL efficiencies to assist in their application in mixed radiation fields. And (3) the shape of composite peak 5 in the glow curve for various HCP types and energies and following high-dose electron irradiation, i.e. the ratio of the intensity of peak 5a to peak 5. Peak 5a is a low-temperature satellite of peak 5 arising from electron-hole capture in a spatially correlated trapping centre/luminescent centre (TC/LC) complex that has been suggested to possess a potential as a solid-state nanodosemeter due to the preferential electron/hole population of the TC/LC at high ionisation density. It is concluded that (1) the predictions of TST are very strongly dependent on the choice of photon energy used in the determination of f(D); (2) modified TST employing calculated values of f(D) at 2 keV is in agreement with 5-MeV alpha particle experimental results for composite peak 5 but underestimates the 1.5-MeV proton relative efficiencies. Both the proton and alpha particle relative TL efficiencies of the high-temperature TL (HTTL) peaks 7 and 8 are underestimated by an order of magnitude suggesting that the HTTL efficiencies are affected by other factors in addition to radial electron dose; (3) the dose-response supralinearity of peaks 7 and 8 change rapidly with photon energy: this behaviour is explained in the framework of the unified interaction model as due to a very strong dependence on photon energy of the relative intensity of localised recombination and (4) the increased width and decrease in T(max) of composite peak 5 as a function of ionisation density is due to the greater relative intensity of peak 5a (a low-temperature component of peak 5 arising from two-energy transfer events, which leads to localised recombination).

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Section: The Shape Of Composite Peak 5 As a Function Of Hcp Type And supporting

confidence: 58%

Mysteries of LiF TLD response following high ionisation density irradiation: nanodosimetry and track structure theory, dose response and glow curve shapes

Horowitz

Fuks

Datz

et al. 2010

Radiation Protection Dosimetry

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show abstract

“…This behaviour can be interpreted as due to an increased intensity of peak 5a relative to peaks 4 and 5 following HID irradiation. The deconvolution analysis into component glow peaks shown in Figure 1 is based on this hypothesis and is supported by T m 2T stop studies (7 ) , which unambiguously show an additional peak between peaks 4 and 5 following HID irradiation.…”

supporting

confidence: 56%

Thermoluminescence solid-state nanodosimetry--the peak 5A/5 dosemeter

Fuks

Horowitz

Horowitz³

et al. 2010

Radiation Protection Dosimetry

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The shape of composite peak 5 in the glow curve of LiF:Mg,Ti (TLD-100) following 90 Sr/ 90 Y beta irradiation, previously demonstrated to be dependent on the cooling rate used in the 4008 8 8 8 8C pre-irradiation anneal, is shown to be dependent on ionisation density in both naturally cooled and slow-cooled samples. Following heavy-charged particle high-ionisation density (HID) irradiation, the temperature of composite peak 5 decreases by ∼58 8 8 8 8C and the peak becomes broader. This behaviour is attributed to an increase in the relative intensity of peak 5a (a low-temperature satellite of peak 5). The relative intensity of peak 5a is estimated using a computerised glow curve deconvolution code based on first-order kinetics. The analysis uses kinetic parameters for peaks 4 and 5 determined from ancillary measurements resulting in nearly 'single-glow peak' curves for both the peaks. In the slow-cooled samples, owing to the increased relative intensity of peak 5a compared with the naturally cooled samples, the precision of the measurement of the 5a/5 intensity ratio is found to be ∼15 % (1 SD) compared with ∼25 % for the naturally cooled samples. The ratio of peak 5a/5 in the slow-cooled samples is found to increase systematically and gradually through a variety of radiation fields from a minimum value of 0.13+ + + + +0.02 for 90 Sr/ 90 Y low-ionisation density irradiations to a maximum value of ∼0.8 for 20 MeV Cu and I ion HID irradiations. Irradiation by low-energy electrons of energy 0.1-1.5 keV results in values between 1.27 and 0.95, respectively. The increasing values of the ratio of peak 5a/5 with increasing ionisation density demonstrate the viability of the concept of the peak 5a/5 nanodosemeter and its potential in the measurement of average ionisation density in a 'nanoscopic' mass containing the trapping centre/luminescent centre spatially correlated molecule giving rise to composite peak 5.

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“…In fact, if the glow-peaks overlap, the fitting procedure is evidently not unequivocal, information about the peak's position and of the parameters must be taken from additional experimental sources (Horowitz et al, 1999;Kitis and Otto, 2000). It can be observed from Table.1 that the highest values of the FOM (%) and the deviation in are observed for the RefGlow.010 glow-curve.…”

Section: The Deconvolution Of the Glocanin Glow-curvesmentioning

confidence: 99%

The deconvolution of thermoluminescence glow-curves using general expressions derived from the one trap-one recombination (OTOR) level model

Sadek

Eissa

Basha

et al. 2015

Applied Radiation and Isotopes

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Ionisation Density Effects in the Thermoluminescence of TLD-100:Computerised Tm-Tstop Glow Curve Analysis

Cited by 52 publications

References 0 publications

Mysteries of LiF TLD response following high ionisation density irradiation: nanodosimetry and track structure theory, dose response and glow curve shapes

Mysteries of LiF TLD response following high ionisation density irradiation: nanodosimetry and track structure theory, dose response and glow curve shapes

Thermoluminescence solid-state nanodosimetry--the peak 5A/5 dosemeter

The deconvolution of thermoluminescence glow-curves using general expressions derived from the one trap-one recombination (OTOR) level model

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