Simulation of competing irradiation and fading effects in thermoluminescence dosimetry

Kitis, G.; Furetta, C.

doi:10.1080/10420150500331438

Cited by 5 publications

(3 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Considering initial irradiation of samples followed by fading at room temperature and assuming first-order kinetics, for a storage time ts>>ti (irradiation time), following expression simulated this case is (Kitis et al, 2005;Gomez-Ros et al, 1996): Φ = Φ0exp(-pt) and then p = (-1/t)ln(Φ/Φ0), where Φ can be considered integrated glow curve or peak area. So by taking into account at final 42 days of fading; p = 0.149 d -1 or 14.9 % lost per day of TL signal for ZnO, and 15.9 % for ZnO:Tb.…”

Section: Fading Of the Tl Signalsmentioning

confidence: 99%

Characterization and thermoluminescence study of gamma irradiated Tb-doped ZnO and undoped ZnO synthesized by spray pyrolysis method

Ortiz-Morales

Garcı́a-Hipólito

Cruz-Zaragoza

et al. 2021

View full text Add to dashboard Cite

High gamma dose-resistant undoped ZnO and Tb-doped ZnO thermoluminescent (TL) micro-phosphors were prepared by the spray pyrolysis method. Scanning electron microscopy shows crystalline rods with hexagonal morphology, (0.1-0.4 µm diameter, and about 1 µm length). Raman spectra dispersion reveals a würtzite form. Photoluminescence (PL) study of irradiated zinc oxide films indicates the generation of defects produced by gamma irradiation resulting in an increased probability of electron-hole exciton recombination. PL spectrum shows emission bands from 5D4-7Fj=6,5,4,3 transitions ascribed to Tb3+ dopant in zinc oxide phosphor. X-ray diffraction patterns for both types of films growth (undoped ZnO and Tb-doped ZnO) are typical of zinc oxide crystalline structure, with no noticeable effect of Tb ions. Dosimetric properties, for both samples, show a low TL fading signal and TL reproducibility signal for undoped ZnO and Tb-doped ZnO samples was 29 and 57 %, respectively. The kinetic parameters such as activation energy E, frequency factor s, and Rm values, were obtained by Computerized Glow Curve Deconvolution (CGCD) assuming Mixed Order Kinetic model (MOK). The results show that the MOK well described the glow curves of zinc oxide films. The heating rate effects produced a broadening of glow peak located at 420 K. For purposes like radiation detector, atomic effective number (Zeff) was obtained: 27.74 and 56.47 for undoped ZnO and Tb-doped ZnO samples, respectively. The samples were exposed to gamma radiation in a wide range of 0.25–20 kGy dose. TL properties of undoped ZnO and Tb-doped ZnO samples show that these materials could be used to detect high doses in a gamma radiation field.

show abstract

Section: Fading Of the Tl Signalsmentioning

confidence: 99%

Characterization and thermoluminescence study of gamma irradiated Tb-doped ZnO and undoped ZnO synthesized by spray pyrolysis method

Ortiz-Morales

Garcı́a-Hipólito

Cruz-Zaragoza

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Levels N (cm -3 ) E (eV) s (s -1 ) A (cm 3 s -1 ) B (cm 3 s -1 ) 1.75 2.510 14 5.010 -10 0.0  i 5.010 13 2.00 1.010 10 1.010 -10 0.0 8  i 3.010 11 1.43 5.010 13 5.010 -7 5.010 -9 9  i 1.010 13 1.75 5.010 14 1.010 -9 5.010 -10 10  i 1.010 14 5.00 1.010 13 1.010 -9 1.010 -10 11  i 5.010 12 5.00 1.010 13 1.010 -10 1.010 -10…”

Section: Fig 2(a)unclassified

“…Another approach towards understanding the complex nature of quartz is by way of simulation/modelling. This has proved very viable in explaining many luminescent phenomena for various materials generally [4,5,6,12,14,25,26]. This process is something identical to virtually synthetizing, say, a TL material with some predetermined properties and subsequently subjecting it to traditional experimental procedures numerically.…”

Section: Introductionmentioning

confidence: 99%

Simulation of an Anomalous Behavior of Thermoluminescence Glow Peak of Quartz from Nigeria

Oniya

O.e.

2018

nuclear

View full text Add to dashboard Cite

Mechanism of the experimentally observed anomalous shift of a thermoluminescence (TL) glow peak that varied with irradiation dose is yet to be fully established. A theory that the anomalous peak must have contained more than one first order composite peaks each with different TL dose characteristics has been one major explanation proposed to explain this observation. This work was undertaken to simulate the anomalous glow peak by using a modified version of a previously proposed model and numerically solving sets of simultaneous differential equations governing the stages of TL phenomena (excitation, relaxation and heating). In the modified model, two additional electron trapping centers were incorporated in order to simulate accurately this glow curve. Computerized glow curve deconvolution (CGCD) analyses was carried out on the simulated glow peak in attempt to retrieve back the electron trapping center energies and to identify their respective peak positions. The outcome of this confirmed the peak to be possibly composite in nature comprising of three overlapping glow peaks at 288, 300 and 317 o C with respective energy gaps of 1.70, 1.73 and 1.75eV. It is therefore further substantiated that this kind of temperature shift of peak with dose resulting from composite glow peaks is possible.

show abstract

Thermoluminescence of single wall carbon nanotubes synthesized by hydrogen-arc-discharge method

Ortiz-Morales

Ortíz-López

Leal-Acevedo

et al. 2019

Applied Radiation and Isotopes

View full text Add to dashboard Cite

Simulation of competing irradiation and fading effects in thermoluminescence dosimetry

Cited by 5 publications

References 13 publications

Characterization and thermoluminescence study of gamma irradiated Tb-doped ZnO and undoped ZnO synthesized by spray pyrolysis method

Characterization and thermoluminescence study of gamma irradiated Tb-doped ZnO and undoped ZnO synthesized by spray pyrolysis method

Simulation of an Anomalous Behavior of Thermoluminescence Glow Peak of Quartz from Nigeria

Thermoluminescence of single wall carbon nanotubes synthesized by hydrogen-arc-discharge method

Contact Info

Product

Resources

About