Tape casting of storage phosphor BaFBr:Eu2+ for X-ray imaging

Li, Hui; Epelbaum, E.; Batentschuk, Miroslaw; Winnacker, A.

doi:10.1016/s0921-5107(02)00388-4

Cited by 8 publications

(7 citation statements)

References 4 publications

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“…If this reasoning holds true, it is expected that a thin dosimeter made of KCl: Eu 2+ , with a thickness of much less than the range of low-energy secondary electrons in the material, would provide significantly lower energy dependence than radiographic film and would have an overall dose response close to water. Modern thin film techniques, for example, tape casting 31 or vacuum evaporation, 32,33 are capable of producing dosimeters in such thin layers. Note that our experiments ͑data not shown͒ demonstrate that current KCl: Eu 2+ dosimeters are easily able to detect sub-cGy dose using, for example, a 5 mW He-Ne yellow laser.…”

Section: Discussionmentioning

confidence: 99%

Quantitative megavoltage radiation therapy dosimetry using the storage phosphor KCl:Eu2+

et al. 2009

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This work, for the first time, reports the use of europium doped potassium chloride ͑KCl: Eu 2+ ͒ storage phosphor for quantitative megavoltage radiation therapy dosimetry. In principle, KCl: Eu 2+ functions using the same photostimulatated luminescence ͑PSL͒ mechanism as commercially available BaFBr 0.85 I 0.15 :Eu 2+ material that is used for computed radiography ͑CR͒ but features a significantly smaller effective atomic number-18 versus 49-making it a potentially useful material for nearly tissue-equivalent radiation dosimetry. Cylindrical KCl: Eu 2+ dosimeters, 7 mm in diameter and 1 mm thick, were fabricated in-house. Dosimetric properties, including radiation hardness, response linearity, signal fading, dose rate sensitivity, and energy dependence, were studied with a laboratory optical reader after irradiation by a linear accelerator. The overall experimental uncertainty was estimated to be within Ϯ2.5%. The findings were ͑1͒ KCl: Eu 2+ showed satisfactory radiation hardness. There was no significant change in the stimulation spectra after irradiation up to 200 Gy when compared to a fresh dosimeter, indicating that this material could be reused at least 100 times if 2 Gy per use was assumed, e.g., for patient-specific IMRT QA. ͑2͒ KCl: Eu 2+ exhibited supralinear response to dose after irradiation from 0 to 800 cGy. ͑3͒ After x ray irradiation, the PSL signal faded with time and eventually reached a fading rate of about 0.1% / h after 12 h. ͑4͒ The sensitivity of the dosimeter was independent of the dose rate ranging from 15 to 1000 cGy/ min. ͑5͒ The sensitivity showed no beam energy dependence for either open x ray or megavoltage electron fields. ͑6͒ Over-response to low-energy scattered photons was comparable to radiographic film, e.g., Kodak EDR2 film. By sandwiching dosimeters between low-energy photon filters ͑0.3 mm thick lead foils͒ during irradiation, the over-response was reduced. The authors have demonstrated that KCl: Eu 2+ dosimeters have many desirable dosimetric characteristics that make the material conducive to radiation therapy dosimetry. In the future, a large-area KCl: Eu 2+ -based CR plate with a thickness of the order of a few microns, created using modern thin film techniques, could provide a reusable, quantitative, high-resolution two-dimensional dosimeter with minimal energy dependence.

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Section: Discussionmentioning

confidence: 99%

Quantitative megavoltage radiation therapy dosimetry using the storage phosphor KCl:Eu2+

et al. 2009

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“…Han et al 12 reported that the dosimeter could be reused at least 100 times at 2 Gy per use. Future development would involve the cre-ation of a large-area KCl: Eu 2+ -based storage phosphor film ͑SPF͒ with minimized energy dependence using modern thin film techniques, for example, tape casting 13,14 or physical vapor deposition ͑PVD͒. [15][16][17] In this paper, we report on Monte Carlo ͑MC͒ studies of the dose response of a KCl: Eu 2+ -based planar dosimeter irradiated in a 6 MV therapeutic beam.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and empirical investigations of for nearly water‐equivalent radiotherapy dosimetry

et al. 2009

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“…Luminescent materials, also called phosphors, can be found in a broad range of display applications 1–3. One of the important technical issues for large‐area displays involving phosphors is low cost processing, such as screen printing,4–6 ink jet printing, and tape casting 2–4. To achieve the cheap processing successfully, the preparation of homogeneous luminescent paste (or suspension) with the dispersion stability of phosphor particles is required.…”

Section: Introductionmentioning

confidence: 99%

Effect of TRITON™ X‐based dispersants bearing a carboxylic terminal group on rheological properties of BAM/ethyl cellulose/terpineol paste

Lee

et al. 2007

J of Applied Polymer Sci

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In this study, we attempted to use TRI-TON TM X (or octyl phenol ethoxylate (OPE) of different oxyethylene units (i.e., n ¼ 2, 5, and 10))-based dispersants containing a carboxylic group in the oxyethylene chain end for the formulation of BAM phosphor paste. Thus, a threecomponent system employing OPE-COOH as a dispersant, terpineol as a solvent, and ethyl cellulose as a binder was compounded with BAM particles, and the rheological properties of the paste were investigated in detail. Among three acidic TRITON X-based compounds we tested (i.e., [OPE2-COOH], [OPE5-COOH], and [OPE10-COOH]), OPE10-COOH containing the highest number of oxyethylene units in the backbone was found to be the dispersant showing the lowest viscosity of BAM paste under identical conditions.

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Tape casting of storage phosphor BaFBr:Eu2+ for X-ray imaging

Cited by 8 publications

References 4 publications

Quantitative megavoltage radiation therapy dosimetry using the storage phosphor KCl:Eu2+

Quantitative megavoltage radiation therapy dosimetry using the storage phosphor KCl:Eu2+

Theoretical and empirical investigations of for nearly water‐equivalent radiotherapy dosimetry

Effect of TRITON™ X‐based dispersants bearing a carboxylic terminal group on rheological properties of BAM/ethyl cellulose/terpineol paste

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