Yuki Furuya

Development of Pr:LuAG Scintillator Array and Assembly for Positron Emission Mammography

Abstract-In order to detect the breast cancer at the early stage with high efficiency, we intend to develop positron emission mammography (PEM), using Pr:LuAG single crystal as a scintillator of this scanner. PEM has the same mechanism of PET, where two 511 keV annihilation gamma-rays are detected by two gamma cameras at opposite side, and reconstruction of the data shows the position of the cancer with malignancy grades. After cutting and polishing processes for each crystal to a physical dimensions of 2.1 × 2.1 × 15 mm3, Pr:LuAG array covered with BaSO4 reflector was used as a sensor head. The one camera unit consisted of 20 × 64 pixels optically coupled with three H8500-03 multi anode PMTs. Our PEM required four cameras at each side. Finally, eight cameras were installed in both sides of the prototype instrument and the spatial resolution was evaluated using the 18F in the breast phantom.

Crystal growth and scintillation properties of lithium potassium yttrium complex fluoride

KLi(Y<inf>1−x</inf>Ce<inf>x</inf>)F<inf>5</inf> (x = 0.001, 0.01, 0.03) single crystals were grown from the melt using the precise atmosphere control type Micro-Pulling-Down (μ-PD) method to examine their potential as a new thermal neutron scintillators. The grown crystals were single-phase materials as confirmed by XRD. Ce³⁺ 5d–4f luminescence observed around 340 nm when exited by α-ray. The radio luminiscence measurements under α-ray excitation (²⁴¹Am) demonstrated the light yield of 450 [ph/5.5MeV-α] and the decay time excited by α-ray exhibited 47 and 256 ns.

Crystal structure of lithium potassium yttrium pentafluoride LiKYF5 prepared from high-temperature melt, F10K2Li2Y2

Abstract F10K2Li2Y2, monoclinic, P21/c (no. 14), a = 6.3683(4) Å, b = 23.888(1) Å, c = 6.4310(4) Å, β = 113.545(2)°, V = 896.9 Å3, Z = 4, Rgt(F) = 0.0312, wRref(F2) = 0.0784, T = 293 K

Crystal growth and characterization of rare-earth doped Na 2 CaLu 2 F 10

0.1%, 0.5%, 1% and 3% Ce doped scintillation crystals based on NaF-CaF<inf>2</inf>-LuF<inf>3</inf> solid solutions were grown from the melt using Micro-Pulling-Down (µ-PD) method. The grown crystals were transparent and their transmittance was approximately 80% for the wavelengths longer than 320 nm. Concerning the scintillation properties, radio-luminescence peaks of the crystals were detected at approximately 330 nm. The light yield of the crystals was also measured using γ-ray (¹³⁷Cs and ²²Na) as the excitation source.

Development of pulsed X-ray tube equipped streak camera system to study scintillation phenomenon

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Crystal growth and scintillation properties of NdF 3 single crystal

NdF 3 single crystal was efficiently grown from the melt by the micro-pulling-down (μ-PD) method. The grown crystal had a single phase confirmed by XRD. Then Optical properties and α-ray excited scintillation properties in Vacuum Ultraviolet (VUV) wavelength region were investigated. It showed 60-80 % transmittance down to 170 nm, and broad luminescence centered at 175 nm. The light yield and decay time of it were also evaluated under 5.5 MeV α-ray excitation (241Am). The light yield was evaluated to be 60 ± 6 [Ph / 5.5 MeV-α], and the decay time was also evaluated to be 6.9 ns under 5.5 MeV a-ray excitation.

Crystal growth and scintillation properties of Nd doped CaF 2 single crystal

Nd3+ doped CaF2 single crystal scintillator has been investigated. We tried to grow 1, 5, 10, 20, 30 and 40% Nd doped CaF2 single crystals by the simple melt-solidifying method. Those sampeles are compared in terms of their X-ray excited radio luminescence spectra, transmittance, α-ray radiated decay time and light yield. When they are irradiated by X-ray the luminescence appears at VUV region. Transmittances of them are more than 70% at wavelengths longer than about 180 nm. In decay time kinetics, the fast components of Nd doped CaF2 are distributed in 8-40 nsec and became shorter with increasing of concentration of Nd. they are related to the Nd3+ 5d-4f VUV emission. The light yield of Nd doped CaF2 are distributed in 5-2500 photon/5.5MeV α and decrease with the increasing of the amount of Nd concentrations.