TY - JOUR
T1 - Kinetic simulation of dose-rate effects in the irradiation stage of LiF:Mg,Ti (TLD-100)
T2 - A model based on hole release via V3-Vk transformation – Implications to TL efficiency
AU - Eliyahu, I.
AU - Oster, L.
AU - Ginsburg, D.
AU - Reshes, G.
AU - Biderman, S.
AU - Horowitz, Y. S.
N1 - Publisher Copyright:
© 2018
PY - 2019/2/1
Y1 - 2019/2/1
N2 - The possibility of undiscovered dose-rate effects in the thermoluminescence (TL) of LiF:Mg,Ti (TLD-100) remains an open question. Previous experimental investigations are inconclusive and have been recently criticized. Earlier kinetic calculations have predicted the likelihood of dose-rate effects mainly based on competition between excitation and trapping rates. In this study we discuss the possibility of dose rate effects due to the likely dependence on dose-rate of V3 creation (a two hole center) and transformation to VK one hole centers via electron capture. Kinetic simulations demonstrate that such a dependence can lead to significant changes in the concentrations of the luminescent centers (LCs) following irradiation and consequently to expected changes in the TL response associated with these LCs. The simulations also predict changes in the concentration of the hole-only and electron-hole configurations of the spatially correlated trapping center-luminescent center giving rise to peaks 4 and 5a respectively in the glow curve of TLD-100. The results further emphasize the importance of highly controlled experimental studies.
AB - The possibility of undiscovered dose-rate effects in the thermoluminescence (TL) of LiF:Mg,Ti (TLD-100) remains an open question. Previous experimental investigations are inconclusive and have been recently criticized. Earlier kinetic calculations have predicted the likelihood of dose-rate effects mainly based on competition between excitation and trapping rates. In this study we discuss the possibility of dose rate effects due to the likely dependence on dose-rate of V3 creation (a two hole center) and transformation to VK one hole centers via electron capture. Kinetic simulations demonstrate that such a dependence can lead to significant changes in the concentrations of the luminescent centers (LCs) following irradiation and consequently to expected changes in the TL response associated with these LCs. The simulations also predict changes in the concentration of the hole-only and electron-hole configurations of the spatially correlated trapping center-luminescent center giving rise to peaks 4 and 5a respectively in the glow curve of TLD-100. The results further emphasize the importance of highly controlled experimental studies.
KW - Conduction band/valence band
KW - Dose rate
KW - Kinetic simulations
KW - Optical absorption dose response
UR - http://www.scopus.com/inward/record.url?scp=85058804145&partnerID=8YFLogxK
U2 - 10.1016/j.nimb.2018.10.021
DO - 10.1016/j.nimb.2018.10.021
M3 - Article
AN - SCOPUS:85058804145
SN - 0168-583X
VL - 440
SP - 139
EP - 145
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
ER -