High-dose characterization of different LiF phosphors

LiF:Mg,Ti detectors show relative efficiency η for heavy charged particles significantly lower than one. It was for a long time not recognised that η varies also for electron energies and, as a consequence for photons. For LiF:Mg,Cu,P detectors measured photon energy response was named ‘anomalous’ because it differed significantly from the ratio of photon absorption coefficients. The decrease of η was explained as a microdosimetric effect due to local saturation of trapping centres around the electron track. For TLD-100 it was noticed by Horowitz that the measured photon energy response disagrees with the ratio of absorption coefficient by about 10%. It was demonstrated that a fraction of the TL signal in LiF:Mg,Ti is generated in the supralinear dose–response range, due to the high local doses generated by photon-induced tracks. Prediction of TL efficiency is particularly important in space dosimetry and in dosimetry of therapeutic beams like protons or carbon ions.

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“…( 31 ) and Bilski et al. ( 32 ) . When only peaks 4 and 5 are taken into account the supralinearity onset starts for doses between 1 Gy and 5 Gy.…”

Section: Dose Response Of Lithium Fluoride Detectors For Photonsmentioning

confidence: 94%

Microdosimetric Understanding of Dose Response and Relative Efficiency of Thermoluminescence Detectors

Olko

Bilski

2020

Radiation Protection Dosimetry

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“…Accurate measurements of f (D) at high dose levels require computerised glow curve deconvolution (CGCD) due to the appearance of a strongly supralinear high-temperature glow curve structure which overlaps substantially with peak 4. CGCD has been carried out up to dose levels of 1000 Gy (52) for GR-200 and 5000-10 000 Gy (7,53,54) for MCP-N. The previously published MCP-N data have been re-analysed in this work with a typical deconvoluted glow curve at high dose as shown in Figure 6 resulting in the values of f (D) shown in Figure 11 and Table 2.…”

Section: Low-let Lif:mcp Dose -Responsementioning

confidence: 99%

Alpha particle and proton relative thermoluminescence efficiencies in LiF:Mg,Cu,P:is track structure theory up to the task?

Horowitz¹,

Siboni²,

Oster³

et al. 2011

Radiation Protection Dosimetry

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“…The data on high-dose experiments with LiF based detectors are summarized in Table 1 together with references to their results, which are described in detail in the next section. Bilski et al, 2007bBilski et al, , 2008bObryk et al, 2009;Obryk, 2010;Khoury et al, 2011;Gieszczyk et al, 2013b; 2013c Electron 6 MeV, 10 MeV 5 kGy -1 MGy Bilski et al, 2010;Obryk, 2010;Mrozik et al, 2014 Proton 25 MeV, 24 Obryk et al, 2008;Obryk, 2010;Mala et al, 2014 3. Characteristics of highly irradiated LiF:Mg,Cu,P and LiF:Mg,Ti phosphors…”

Section: High-dose Experimentsmentioning

confidence: 99%

On LiF:Mg,Cu,P and LiF:Mg,Ti phosphors high & ultra-high dose features

Obryk

Khoury

Barros

et al. 2014

Radiation Measurements

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HIGHLIGHTS• TL peak 'B' occurs for LiF:Mg,Cu,P after high doses of all radiation types.• Highly irradiated LiF:Mg,Ti glow-curve shape depends on the radiation quality.• High dose features of both phosphors are significantly different in many aspects.• Associated PL/TL high-dose measurements are possible using LiF:Mg,Cu,P.• Dopants role is crucial for high-dose features of lithium fluoride based phosphors. AbstractLiF:Mg,Ti and LiF:Mg,Cu,P are well known thermoluminescence (TL) dosimetry materials since many years. A few years ago their properties seemed well known and it was widely believed that they are not suitable for the measurement of doses above the saturation level of the TL signal, which for both materials occur at about 1 kGy.The high-dose high-temperature TL emission of LiF:Mg,Cu,P observed at the IFJ in 2006, which above 30 kGy takes the form of the so-called TL peak 'B', opened the way to use this material for measuring the dose in the high and ultra-high range, in particular for the monitoring of ionizing radiation around the essential electronic elements of high-energy accelerators, also fission and fusion facilities, as well as for emergency dosimetry. This discovery initiated studies of high and ultra-high dose characteristics of both these phosphors, which turned out to be significantly different in many aspects. These studies not only strive to refine the method for measuring high doses based on the observed phenomenon, but also, and perhaps above all, bring us closer to understanding its origin and essence. This manuscript aims to review existing research data on the high and ultra-high dose features of both LiF based phosphors.

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High-dose characterization of different LiF phosphors

Cited by 29 publications

References 7 publications

Microdosimetric Understanding of Dose Response and Relative Efficiency of Thermoluminescence Detectors

Microdosimetric Understanding of Dose Response and Relative Efficiency of Thermoluminescence Detectors

Alpha particle and proton relative thermoluminescence efficiencies in LiF:Mg,Cu,P:is track structure theory up to the task?

On LiF:Mg,Cu,P and LiF:Mg,Ti phosphors high & ultra-high dose features

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