Thermoluminescence Properties for X-ray of Cr-doped Al2O3 Ceramics

Self Cite

Despite their advantages, two-dimensional (2D) thermoluminescence dosimeters (TLDs) have not yet replaced film dosimeters owing to their nonuniformity and low repeatability. A 2D TLD based on Al 2 O 3 :Cr ceramics is a promising new reusable passive dosimeter. 2D Al 2 O 3 :Cr TLDs can be used for geometry check tests and dose distribution verification in robotic radiosurgery using monoenergetic X-ray beams. In this work, the dependence of energy on the field size and water depth of 2D Al 2 O 3 :Cr TLDs for 4, 6, and 10 MV X-ray beams was investigated, because multienergy X-ray beams are used in radiotherapy. Intensity-modulated radiotherapy plan verifications were performed using the TLDs. The TLDs were found to have a large field size dependence for each energy, but their water depth dependence was small at a water depth above 4 cm for each energy. The relative dose distributions were verified with high accuracy using the TLDs.

Section: D Tld and 2d Tl Dosimetrymentioning

confidence: 99%

“…Recently, we have developed a reusable passive 2D TLD based on Cr-doped Al 2 O 3 (14) (2D Al 2 O 3 :Cr TLD) that can acquire radiation images with high spatial resolution. Al 2 O 3 :Cr TLDs are robust and easy to handle.…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional Thermoluminescence Dosimetry Using Al2O3:Cr Ceramics for 4, 6, and 10 MV X-ray Beams

Yanagisawa¹,

Maruyama²,

Oh³

et al. 2020

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“…In RPL materials, new luminescent centers are generated by irradiation typically owing to valence changes of dopant ions. As well as research for scintillators, it is still attractive to develop novel TL, (36)(37)(38)(39) OSL, (40)(41)(42) and RPL (43,44) materials.…”

Section: Introductionmentioning

confidence: 99%

Scintillation and Dosimetric Properties of Monocrystalline and Polycrystalline Li2B4O7

Kawaguchi¹,

Okada²,

Futami³

et al. 2020

We have performed a comparative study on the scintillation and dosimetric properties of monocrystalline and polycrystalline Li 2 B 4 O 7 samples. The scintillation light yield of the monocrystalline Li 2 B 4 O 7 sample was higher than that of the polycrystalline Li 2 B 4 O 7 sample. In contrast, the thermoluminescence (TL) intensity of the polycrystalline Li 2 B 4 O 7 sample was higher than that of the monocrystalline Li 2 B 4 O 7 sample. These results can be explained by the difference in trap concentration between the monocrystalline and polycrystalline Li 2 B 4 O 7 samples. It has been assumed that the monocrystalline Li 2 B 4 O 7 sample shows a higher scintillation light yield owing to its lower trap concentration, and the polycrystalline Li 2 B 4 O 7 sample shows a higher TL intensity owing to its higher trap concentration.

“…Regarding the forms of the phosphor materials utilized in radiation detectors, they can be categorized into three types: single crystal, opaque ceramic, and glass. (9)(10)(11)(12)(13)(14) On the other hand, transparent ceramics have been attracting attention as a new material form of storage phosphors in recent years. In comparison with single crystals and opaque ceramics, transparent ceramics show outstanding TSL and OSL properties because of their high density of defect centers and transparency.…”

Section: Introductionmentioning

confidence: 99%

Optical and X-ray-induced Luminescence Properties of Calcium Phosphate of Transparent Ceramic Form

Kato¹,

Nakauchi²,

Kawaguchi³

et al. 2020

Undoped and Sb-doped calcium phosphate transparent ceramics were prepared by the spark plasma sintering technique, and their optical and X-ray-induced luminescence properties were investigated. Regarding their optical properties, the transmittance of the undoped transparent ceramic with a thickness of 1.05 mm was higher than 50% in the range of 500-2500 nm. The undoped calcium phosphate exhibited an emission peak at 450 nm due to excitons. On the other hand, the Sb-doped calcium phosphate showed a broad emission peak attributable to the 3 P 1 -1 S 0 transitions of Sb 3+ ions around 500 nm in both PL and scintillation spectra. The obtained scintillation decay time constants of the 0.1% Sb-doped calcium phosphate were 1.2 and 7.9 μs. Glow peaks were detected at 90, 160, and 360 °C. The TSL intensity decreased with the increase in Sb concentration.