Scintillation and dosimetric properties of Ce-doped 6LiF-CaF2 eutectic composites

Nakamura

et al. 2020

J. Ceram. Soc. Japan

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We synthesized a Dy-doped CaF 2 translucent ceramic by the spark plasma sintering method, and investigated its scintillation and dosimetric properties compared with those of the single crystal. Both the samples showed sharp peaks across 480670 nm due to the 4f4f transitions of Dy 3+ , and a broad peak approximately at 300 nm due to the self-trapped excitons. The decay time constants of both the samples in scintillation were approximately 5 ms, which was close to those for the 4f4f transitions of Dy 3+. Regarding thermally-stimulated luminescence, the translucent ceramic exhibited higher sensitivity than the single crystal, and the dynamic range was at least 0.01100 mGy. In addition, both the samples showed optically stimulated luminescence due to the 4f4f transitions of Dy 3+ during 590 nm stimulation light, but the lowest detection limit of both the samples was approximately 10 mGy.

Section: Experimental Methodsmentioning

confidence: 77%

Scintillation and dosimetric properties of Dy-doped CaF2 translucent ceramic and single crystal

Kawano

Nakamura

et al. 2020

J. Ceram. Soc. Japan

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“…Thus, we confirmed that the LiF/CaF 2 :Dy eutectic composite can act as the TL dosimetric material in the X-ray dose range from 1 mGy to 10 Gy. Since the lower detection limits of the non-doped, 15) Ce-doped, 16) Eu-doped, [17][18][19] and Tb-doped LiF/CaF 2 eutectic composites 20) are 0.01-1 mGy, that of the LiF/CaF 2 :Dy eutectic composite is not superior. However, we consider that the LiF/CaF 2 :Dy eutectic composite is one of the interesting materials because it is a dual functional material for neutron detection and X-ray dosimetry.…”

Section: Resultsmentioning

confidence: 98%

“…It means the production of eutectics can be relatively cost effective. We have studied the non-doped, 15) Ce-doped, 16) Eu-doped, [17][18][19] and Tb-doped LiF/CaF 2 eutectics. 20) In the case of LiF/CaF 2 eutectics, LiF can act as a neutron converter and CaF 2 layer can act as a luminescence material.…”

Section: Introductionmentioning

confidence: 99%

Scintillation and dosimetric properties of LiF/CaF₂:Dy eutectic composite

Kawaguchi

Kimura

et al. 2022

Jpn. J. Appl. Phys.

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Scintillation and dosimetric properties of a LiF/CaF2:Dy eutectic composite have been studied. In the X-ray induced emission spectrum and decay curve, we observed luminescence due to self-trapped exciton of CaF2 and 4f–4f transitions of Dy3+ ions. The LiF/CaF2:Dy eutectic composite showed the light yield of 3000 photons/neutron as a neutron scintillator. The LiF/CaF2:Dy eutectic composite showed the measurable range from 1 mGy to 10 Gy as a thermoluminescence dosimetric material. The LiF/CaF2:Dy eutectic composite can act as a dual functional material for neutron detection and X-ray dosimetry.

“…19) Such TL dosimetric materials are mainly sintered ceramics or inorganic powder composites with an organic matrix. On the other hand, we have reported TL dosimetric properties of LiF/CaF 2 :Ce, 20) LiF/CaF 2 :Eu, 21) and non-doped LiF/CaF 2 22) eutectic composites. These eutectics are the rare reported examples of inorganicinorganic composites as TL dosimetric materials.…”

Section: Introductionmentioning

confidence: 98%

Dosimetric properties of Tb-doped LiF/CaF2 eutectic composite

Kawaguchi

Kimura

et al. 2021

J. Ceram. Soc. Japan

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We have developed a LiF/CaF 2 :Tb eutectic composite as a novel thermoluminescence (TL) dosimetric material. The LiF/CaF 2 :Tb eutectic composite was obtained using a melt-solidification method with a lower melting temperature than that of LiF and CaF 2 . The results of the PL emission and excitation spectra, the X-ray induced radioluminescence decay curve, and the TL emission spectrum indicate that the emissions of LiF/CaF 2 :Tb eutectic composite are due to 4f-4f transitions of the Tb 3+ ion. The integrated TL intensity of the LiF/CaF 2 :Tb eutectic composite was 3.6 times higher than that of the commercial CaSO 4 :Tm dosimetric material that is known to show a relatively high TL intensity. The dose response curve of the LiF/CaF 2 :Tb eutectic composite was measured and the lower detection limit was 0.01 mGy which is the lowest value among the LiF/CaF 2 based composites.