A correlation study on the TL, OSL and ESR signals in commercial BeO dosimeters yielding intense transfer effects

Aşlar, Engin; Meriç, Niyazi; Şahi̇ner, Eren; Erdem, Onur; Kitis, G.; Polymeris, George S.

doi:10.1016/j.jlumin.2019.116533

“…Bulur and Göksu [ 8 ] were the first who reported new (OSL) properties from an old dosimetric (TL) material before it was finally adopted in a commercial OSL dosimetry system [ 2 , 9 , 10 , 11 , 12 ]. The majority of the aforementioned TL advantages are relevant also for the OSL signal, in conjunction to a convenient OSL shape that yields a fast-decaying OSL component [ 13 , 14 , 15 ]. Nevertheless, the mechanism responsible for the OSL signal is not completely understood.…”

Section: Introductionmentioning

confidence: 99%

“…Among several other TL and OSL features, this latter quality was thoroughly discussed in the framework of the latest Solid-State Dosimetry conference that took place in Hiroshima, Japan in 2019. For an overview on both favorable and limiting properties of BeO, readers are referred to recent articles on the topic by Aşlar et al [ 14 ], Polymeris et al [ 15 ], and Yukihara [ 3 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Thermally Assisted Optically Stimulated Luminescence (TA-OSL) from Commercial BeO Dosimeters

Polymeris

¹

2023

Materials

1

0

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BeO is another luminescent phosphor with very deep traps (VDTs) in its matrix that could not be stimulated using either thermal or conventional optical stimulations. The present study attempts to stimulate these traps using thermally assisted optically stimulated luminescence (TA-OSL), a combination of simultaneous thermal and optical stimulation that is applied to the material following a thermoluminescence measurement up to 500 °C. An intense, peak-shaped TA-OSL signal is measured throughout the entire temperature range between room temperature and 270 °C. This signal can be explained as the transfer of charges from VDTs to both dosimetric TL traps. Experimental features such as the peaked shape of the signal along with the presence of residual TL after the TA-OSL suggest that recombination of TA-OSL takes place via the conduction band. Isothermal TA-OSL is not effective for extending the maximum detection dose thresholds of BeO, unlike minerals such as quartz and aluminum oxide. Nevertheless, TA-OSL could be effectively used in order to either (a) control the occupancy of VDTs, circumventing the intense sensitivity changes induced by long-term uses and high accumulated dose to the VDTs, or (b) measure the total dose accumulated over a series of repetitive dose calculations.

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“…There may, however, be advantages to BeO ceramics for OSL dosimetry. As with Al 2 O 3 :C, BeO has both thermal and optically stimulated properties [2]. While BeO is not commonly used for clinical in-vivo dosimetry, it has been established as a radiation dosimeter in other areas [10].…”

Section: Introductionmentioning

confidence: 99%

“…There may also be additional dosimetry information able to be obtained in a newly discovered BeO property of thermally transferred optically stimulated luminescence. Observations have shown that heating to a temperature of ∼ 260 °C post bleaching results in a recovery of the OSL signal [2,12]. This property may mean a possibility to record and quantify a 'sum dose history' over multiple irradiations.…”

Section: Introductionmentioning

confidence: 99%

A direct comparison of the optically stimulated luminescent properties of BeO and Al2O3 for clinical in-vivo dosimetry

Broadhead

¹

,

Noble

²

,

Prabhakar

³

2022

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Optically stimulated luminescence dosimetry is a relatively recent field of in-vivo dosimetry in clinical radiotherapy, developing over the last 20 years. As a pilot study, this paper presents a direct comparison between the sensitivity variance with use, stability of measurement and linearity of the current clinical standard Al2O3:C and a potential alternative, beryllium oxide. A set of ten optically stimulated luminescence dosimeters (OSLD), including five of each type, were used simultaneously and irradiated on a Versa HD linear accelerator. Having similar sensitivity, while Al2O3:C showed a relatively stable signal response from initial use, BeO was found to have a higher response to the same dose. However, BeO displayed a strong exponential decline from initial signal response following a model of $$Respons{e}_{BeO}=(0.55\pm 0.05){e}^{-\left(0.40\pm 0.05\right)x}+(0.54\pm 0.01)$$ R e s p o n s e BeO = ( 0.55 ± 0.05 ) e - 0.40 ± 0.05 x + ( 0.54 ± 0.01 ) , reaching stability after approximately 10 irradiation cycles. BeO was shown to have potentially higher accuracy than Al2O3:C, with less variation between individual doses. Both OSLD showed good linearity between 0.2–5.0 Gy. Between these bounds, Al2O3:C demonstrated a strong linear response following the trend $$Dose_{Al_{2}O_{3}, group(adj)}=(1.00\pm 0.09)x-(0.02\pm 0.04)\,{\text{Gy}}$$ D o s e A l 2 O 3 , g r o u p ( a d j ) = ( 1.00 ± 0.09 ) x - ( 0.02 ± 0.04 ) Gy , however beyond this showed deviation from linearity, resulting in a measured dose of $$12.0\pm 0.2$$ 12.0 ± 0.2 Gy at 10.0 Gy dose delivery. BeO showed strong linearity across the full examined range of 0.2–10.0 Gy with following a model of $$Dos{e}_{BeO, ind}=(0.98\pm 0.01)x+(0.04\pm 0.01)$$ D o s e B e O , i n d = ( 0.98 ± 0.01 ) x + ( 0.04 ± 0.01 ) Gy with a recorded dose at 10.0 Gy delivery as $$9.9\pm 0.1$$ 9.9 ± 0.1 Gy. In conclusion, BeO does show large variance in sensitivity between individual OSLD and a considerable initial variance and decline in dose–response, however after pre-conditioning and individual normalisation to offset OSLD specific sensitivity BeO provides not only a viable alternative to Al2O3:C, but potentially provide higher accuracy, precision and reproducibility for in-vivo dosimetry.

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“…Nevertheless, while for the field of thermoelectrics, the presence of oxides is not welcome for the operational stability, in the field of TL dosimetry, a variety of oxides have been effectively applied as sensitive TLDs. Aluminium oxide (Al 2 O 3 :C) (Akselrod and Kortov, 1990;Markey et al, 1995) and beryllium oxide (BeO) (Sommer and Henniger, 2006;Sommer et al, 2007Sommer et al, , 2008Yukihara, 2019aYukihara, , 2019bAşlar et al, 2019) stand among the most distinguished members of this list; for an extended review on the oxides used as TLDs, the readers could refer to McKeever et al (1995).…”

Section: Introductionmentioning

confidence: 99%

Component-Resolved Analysis Towards Correlation between Thermoluminescence and Optically Stimulated Luminescence in Commercial Magnesium Oxide

Meriç

¹

,

Şahi̇ner

²

,

Kitis

³

et al. 2021

Geochronometria

Self Cite

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0

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The present study aimed at quantifying the relationship between TL and either CW-OSL or LM-OSL using commercially available magnesium oxide. The samples were bleached at two different temperatures, and a component-resolved analysis on the integrated signals was performed. According to the data of the present study, each one among the five observed LM-OSL component receives electrons from at least two different TL peaks. Two different fast OSL components were resolved in the LM-OSL curves, both accumulating electrons from all TL glow peaks with Tmax>150°C. Component C 3 is very well correlated with the TL peaks at 102, 135 and 194°C, while components C4 and C 5 are related to the TL glow peaks of 292°C, 353°C and 464°C. We note that for CW-OSL the resolution is good when two or more components differ in intensity by an order of magnitude. Blue stimulation depletes substantially the first two TL peaks but not the third peak. Substantial depletion of the high-temperature TL peaks is achieved only by using the LM-OSL configuration. The results of the present study suggest that the traps that contribute to TL and OSL are the same, despite using different recombination pathways.

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A correlation study on the TL, OSL and ESR signals in commercial BeO dosimeters yielding intense transfer effects

Cited by 19 publications

References 38 publications

Thermally Assisted Optically Stimulated Luminescence (TA-OSL) from Commercial BeO Dosimeters

Thermally Assisted Optically Stimulated Luminescence (TA-OSL) from Commercial BeO Dosimeters

A direct comparison of the optically stimulated luminescent properties of BeO and Al2O3 for clinical in-vivo dosimetry

Component-Resolved Analysis Towards Correlation between Thermoluminescence and Optically Stimulated Luminescence in Commercial Magnesium Oxide

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