Luminescence emission of natural fluorite and synthetic CaF2:Mn (TLD-400)

We fabricated a Tm-doped CaF2 translucent ceramic by spark plasma sintering (SPS), and evaluated its photoluminescence (PL), scintillation, and dosimetric properties compared with those of a single crystal. Both the samples exhibited emission peaks originating from the 4f–4f transitions of Tm3+ under visible-light and X-ray irradiation. The intensities of PL and scintillation for the single crystal were higher than those for the translucent ceramic. Regarding thermally stimulated luminescence (TSL), both the samples showed main glow peaks at approximately 145 and 265 °C. The Tm-doped translucent ceramic exhibited a higher TSL sensitivity than did the single crystal and showed a linear response against X-ray dose over the dose range from 0.01 to 1000 mGy.

Section: Introductionmentioning

confidence: 99%

Comparative study of scintillation and dosimetric properties between Tm-doped CaF₂translucent ceramic and single crystal

Kawano

Nakauchi

Fukuda

et al. 2018

“…The shape of the glow curve, which consists of the weak glow peaks on the low-temperature side and the main peak at 300 °C, coincided with past researches about powders and single crystals. 35,36) Moreover, the TC specimen showed higher intensity of Peak 5 than those of the SC and Cer specimens. Generally, ceramics include more lattice defects than single crystals with the same chemical composition.…”

Section: Resultsmentioning

confidence: 91%

Comparative study of optical and dosimetric properties of Mn-doped CaF₂

Kato,

Nakauchi,

Kawaguchi

et al. 2023

Mn-doped CaF2 has been used as a thermoluminescence detector. On the other hand, dosimetric properties of Mn-doped CaF2 transparent ceramics have not been thoroughly investigated. In this study, transparent ceramics (TC) of Mn-doped CaF2 were fabricated, and the optical and thermally stimulated luminescence (TSL) properties were investigated in comparison with Mn-doped CaF2 single crystal (SC) and opaque ceramics (Cer). The transmittance at 500 nm of the TC, SC, and Cer specimens was 58, 91, and 0%, respectively. All the specimens showed a PL peak at 490 nm with 340, 400, and 450 nm excitations, originating from d-d transitions of Mn2+ ions. The emission and excitation spectra changed with X-ray irradiation, and this phenomenon was attributed to optically stimulated luminescence. All the specimens mainly had a TSL glow peak at 300 °C. The TC specimen exhibited a higher TSL intensity than the SC and Cer specimens.

“…The shapes of these glow curves are consistent with previous reports using powders and single crystals. 79,80) Compared with the undoped CaF 2 , 25) the glow peak at low temperatures side is attributed to the host. On the other hand, the glow peak at 300 °C was reported to be due to F A centers (Mn-F center: F center located near Mn).…”

Section: Caf 2 : Mnmentioning

confidence: 94%

Thermally stimulated luminescence properties of transparent ceramics for personal dosimetry

Kato

Nakauchi²,

Kawaguchi³

et al. 2022

Transparent ceramics have attracted attention as a new optical material that can replace glasses and single crystals. In this study, we investigated the application of transparent ceramics as dosimeter materials. Specifically, thermally stimulated luminescence (TSL) properties of MgO, Al2O3, and CaF2: Mn transparent ceramics were evaluated in comparison with those of single crystals and opaque ceramics. As a result, transparent ceramics of three chemical compositions exhibited the highest TSL intensity.