BeO optically stimulated luminescence dosimetry using automated research readers

Yukihara, E.G.; Andrade, Adriano B.; Eller, S.A.

doi:10.1016/j.radmeas.2016.08.008

Cited by 30 publications

(16 citation statements)

References 29 publications

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“…Specifically, BeO exhibits a near tissue equivalency over a wide range of energies [3], which is favorable in personal dosimetry, while exhibiting similar properties in terms of the linearity of the dose-response, detection limits, etc. [4]- [7]. In OSL dosimetry only the first part of the signal is initially employed for analysis.…”

Section: Introductionmentioning

confidence: 99%

myOSL – A NEW SERIES OF PORTABLE AND STATIONARY EQUIPMENT FOR OSL-DOSIMETRY BASED ON BeO

Richter¹,

Słonecka²,

Schischke³

et al. 2019

RAD Conference Proceedings

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A new series of dosimetric devices, based on the optically stimulated luminescence (OSL) of BeO, is presented. The dosimetric properties of BeO and the use of OSL are favorable with a linear range at least up to 10 Sv, near tissue energy response, and because of the use of OSL as a measurement technique, the dose information can be re-read. The myOSLraser device combines measurement and zeroing equipment in a single unit and is thus cost and time efficient. The manual reader for single myOSLdosimeters, consisting of two BeO-elements for Hp(0.07) and Hp(10), can be expanded by myOSLautomation, which allows a fully automated analysis of 200 dosimeters. The system exceeds the requirements of EN/IEC 62387. A truly portable handheld device (myOSLchip) allows the manual operation of single element dosimeters, e.g. in phantoms. A simple method is proposed to use the OSL decay signal for the normalization of equipment and bringing into line the sensitivity between instruments.

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Section: Introductionmentioning

confidence: 99%

myOSL – A NEW SERIES OF PORTABLE AND STATIONARY EQUIPMENT FOR OSL-DOSIMETRY BASED ON BeO

Richter¹,

Słonecka²,

Schischke³

et al. 2019

RAD Conference Proceedings

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“…BeO [209] is a near-tissue equivalent (Zeff = 7.14) material with high sensitivity suitable for radiation dosimetry and low cost [231,232]. Similarly to Al2O3:C, initial luminescent studies on BeO involved investigations into its TL properties [233].…”

Section: Radiation Dosimeters and Materialsmentioning

confidence: 99%

The Luminescence of Lanthanide-doped NaMgF3 Nanoparticles: Radioluminescence, Radiophotoluminescence and Optically Stimulated Luminescence

Nalumaga¹

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NaMgF3 is a host material that has demonstrated luminescent properties suitable for radiation dose measurements when doped with lanthanide (Ln) ions. NaMgF3 has a response to ionising radiation similar to that of tissue, and hence it has potential application in radiotherapy where a high level of accuracy is required. This thesis focused on investigations into the suitability of NaMgF3 nanoparticles for radiation dose measurements. Nanoparticles display advantages that can be exploited to increase spatial resolution in two-dimensional dosimetry. Additionally, nanoparticles exhibit new and different distributions of optically active traps, and their luminescence can be sensitised to increase the signal to noise. Hence, this thesis presents results obtained from the synthesis and characterisation of Ln-doped NaMgF3 nanoparticles. The nanoparticles were synthesised via the hydrothermal, reverse micelle and thermolysis techniques. Structural studies were carried out, followed by investigations on the effect of X-ray irradiation on the luminescent properties of the nanoparticles. It was observed that compared to the bulk materials, the nanoparticles exhibited increased oxygen (O2-)-related defect luminescence and favoured substitution of trivalent ions over the divalent ions. The behaviour was attributed to the stability of trivalent ions in aqueous solutions during nanoparticle synthesis, which encouraged increased incorporation of O2--related defects to create charge neutrality. O2--related defects allowed for O2- → Yb3+ charge transfer process, hence Yb3+ emission in the infrared region. X-ray stimulation resulted in Yb3+ → Yb2+ radiophotoluminescence (RPL), but the increase in Yb-dopant concentration revealed no significant effect on the structural and luminescent properties. Most of the studied materials exhibited multiple luminescence properties for monitoring radiation doses, which would increase the dose accuracy. Ce-doped nanoparticles exhibited the first reported optically stimulated luminescence (OSL) in Ln-doped near tissue-equivalent NaMgF3 nanoparticles suitable for total radiation measurements. OSL occurred through a series of processes, including the creation of F-centres through X-ray irradiation and optical stimulation to release electrons that recombined with holes trapped at Ce4+ sites, followed by Ce3+ emission. In addition, the Ce3+ → Ce4+ RPL effect suitable for cumulative radiation monitoring was observed from isolated and aggregated Ce3+ sites in the Ce-doped nanoparticles, providing an additional method to increase dose accuracy. Furthermore, the Ce,Sm co-doped NaMgF3 nanoparticles demonstrated suitability for real-time and cumulative radiation dose monitoring via Sm radioluminescence after a priming dose and multiple Ce3+ → Ce4+, Sm3+ → Sm2+, and O2- → O- RPL signals through which cumulative radiation doses can be determined. Finally, the applicability of singly doped oleic acid-capped NaMgF3:Eu and NaMgF3:Sm nanoparticles for radiation monitoring via the Eu3+ → Eu2+ and Sm3+ → Sm2+ RPL effects were demonstrated. The studies were followed by investigations of the sensitisation of Eu3+ and Sm3+ luminescence signals using 2-thenoyltrifluoroacetone (TTFA). The first successful sensitisation of NaMgF3 nanoparticles was demonstrated through remarkable TTFA → Eu3+ energy transfer. However, minimal TTFA → Sm3+ sensitisation was observed, attributable to a non-optimal energy difference between the TTFA triplet state and the Sm3+ resonance energy level, encouraging back energy transfer. TTFA → O2- sensitisation was additionally observed in the NaMgF3:Sm nanoparticles. Furthermore, enhancement of Sm3+ luminescence was additionally demonstrated in the Ce,Sm co-doped nanoparticles via energy transfer from the Ce3+ fully allowed 4f → 5d transitions. The studies resulted in a wealth of information, and where possible, detailed schematic models are presented to explain the observations, which will guide future research. Ultimately, nanoparticles display luminescent properties suitable for dosimetry applications, and the results encouraged further research into the application of nanoparticles as dosimeter materials.

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“…Os valores de χ 2 apresentam-se dentro do intervalo de 108 a 209, em estando dentro de uma faixa razoável com relação ao número de graus de liberdade (ν = 115). [29] foram realizadas irradiações com beta e leituras com estímulo azul. Os valores apresentados por Yukihara et al(2016) [29] são compatíveis com os obtidos nesse trabalho para amostras irradiadas com gama, sendo que a componente de decaimento rápida de 15s −1 corresponde, muito provavelmente, ao efeito de fading.…”

Section: Ajustes De Dois Decaimentos Exponenciaisunclassified

“…a r r a y ( [ 1 / ( s x [ i ] * s x [ i ] ) f o r i i n r a n g e ( l x ) ] ) 22 w avg = np . d o t ( x , p ) / sum ( p ) 23 r e t u r n w avg 24 25 # #################################### 26 # ## w e i g h t e d a v e r a g e d e v i a t i o n 27 # #################################### 28 # i t i s n o t t h a t i m p o r t a n t 29 r e t u r n a , s i g m a a , s y e s t i m a t e 79 # ## e x a m p l e 1 : l s m l i n e a r f i t ( x , y , s y ) 80 # y = np . a r r a y ( [ 0 .…”

Section: Apêndice a -Biblioteca Em Pythonunclassified

“…Göksu[14] apontaram a existência de três componentes dos sinais CW-OSL, essas três são: decaimento rápido, decaimento lento e efeito de fototransferência. Yukihara et al[29] apresenta 3 componentes de decaimento de 15s −1 para decaimento Informações obtidas com ajustes de dois decaimentos exponenciais dos sinais CW-OSL das amostras de BeO. Cada dado representa um conjunto de 4 amostras, as incertezas atribuidas aos parâmetros são dadas pelas médias e desvio padrões e o número de graus de liberdade dos ajustesé de 115.…”

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Estudo do comportamento de sinais OSL de BeO e Al2O3:C usando o Modelo OTOR Simplificado e Método dos Mínimos Quadrados

Soares¹

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BeO optically stimulated luminescence dosimetry using automated research readers

Cited by 30 publications

References 29 publications

myOSL – A NEW SERIES OF PORTABLE AND STATIONARY EQUIPMENT FOR OSL-DOSIMETRY BASED ON BeO

myOSL – A NEW SERIES OF PORTABLE AND STATIONARY EQUIPMENT FOR OSL-DOSIMETRY BASED ON BeO

The Luminescence of Lanthanide-doped NaMgF3 Nanoparticles: Radioluminescence, Radiophotoluminescence and Optically Stimulated Luminescence

Estudo do comportamento de sinais OSL de BeO e Al<sub>2</sub>O<sub>3</sub>:C usando o Modelo OTOR Simplificado e Método dos Mínimos Quadrados

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