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To measure the flux of atmospheric neutrons and study the neutron contribution to the background of the main detector of the PoGOLite (Polarized Gamma-ray Observer) balloon-borne experiment, a thermal-neutron detector with a phoswich system of LiCaAlF6 (Eu) and BGO crystal scintillators is developed. The performance to separate thermal-neutron events from those of gamma-rays and charged particles...
In the present paper, we describe the development of an α-ray imaging detector based on a ZnO single crystalline scintillator and a position-sensitive photomultiplier tube (PSPMT). The ZnO crystal was grown by the hydrothermal synthesis method with 2-inch-φ in diameter. The ZnO specimen was polished out to be 0.5 mm in thickness. After optically coupling with PSPMT, the crystal was irradiated with...
These instructions provide guidelines for preparing manuscripts for submission to the Conference Record (CR) of the 2010 IEEE Nuclear Science Symposium and Medical Imaging Conference. If you are using Microsoft Word 6.0 or later to prepare your manuscript, you should use this document as a template. Define all symbols used in the abstract. Do not cite references in the abstract.
Rare earth (Pr, Nd and Tm) doped Lu2SiO5 (LSO) single crystals were grown by the micro-pulling down (μ-PD) method. The concentrations were added 0.05, 0.10, and 0.25% of Pr, 0.10, 0.25, and 0.50% of Nd, 0.1, 1, 10, and 100% of Tm with respect to Lu, respectively. Optical and radiation measurements were carried out on the samples. Pr samples have a transparency of about 80% in visible wavelength range...
KLi(Y1-xCex)F5 (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...
Thermal neutron imaging with Eu doped 6LiCaAlF6, which is a novel thermal neutron scintillator, was demonstrated. Eu doped 6LiCaAlF6 single crystal was grown by Czochralski technique and grown crystal was cut and polished to a plate shape. Setup of the thermal neutron imaging consisted of the plate shaped Eu doped 6LiCaAlF6, a position sensitive photomultiplier tube, Cd-mask and 252Cf in the polyethylene...
As a candidate for the alternatives to 3He neutron detector, 2 inch size LiF-based eutectic composites were fabricated by Bridgman technique. The eutectic composites showed a good transparency and well ordered lamellar structure. Neutron response of the several eutectic composites were evaluated and LiF/SrF2:Ce performed the better alpha/gamma ratio and high light yield. The preliminary test of neutron...
Scintillation properties of Nd-doped Lu3Al5O12 (Nd:LuAG) single crystals grown by the micro-pulling down (μ-PD) method have been studied. The Nd concentration ranged from 0.1 to 3 mol%. The grown crystals were transparent and had a single-phase confirmed by powder XRD measurements. In transmittance spectra, they showed about 80% transmittance down to 300 nm and some weak 4f-4f absorption lines appeared...
Ce 0.1 % doped KLu2F7 single crystal was successfully grown from the melt by the modified micro-pulling-down (μ-PD) setup and quenching method. Transmittance, photoluminescence spectrum, photoluminescence decay time, radioluminescence decay time and light yield were measured. It showed more than 80 % transmittance and emission spectrum excited by 290 nm was observed around 377 nm. The decay time of...
Thermal neutron imaging with Ce doped 6LiCaAlF6, which is a novel thermal neutron scintillator, was demonstrated. Ce doped 6LiCaAlF6 single crystal was grown by Czochralski technique and grown crystal was cut and polished to a plate shape. Setup of the thermal neutron imaging consisted of the plate shaped Ce doped 6LiCaAlF6, a position sensitive photomultiplier tube, alphabet-shaped Cd-masks and 252...
In this paper, the first detection result of coherent scatterers (CSs) in forest environment is addressed. As a scatterer associated with CS, the dihedral structure consists of the tree-trunk like a vertical cylinder and the ground surface is assumed. The potential of CSs as being the phase stable scatterers as permanent scatterers will be also demonstrated with P-&L-band Pol-InSAR datasets acquired...
Floating Gate (FG) NAND scaling has been severely challenged by the reduction of gate coupling ratio (CR) and increase in FG interference (FGI) below 30nm node. Firstly, scalability of inverted "T" shaped FG is evaluated by 3D electrostatics simulation. It is shown that coupling ratio (CR) and Floating Gate Interference (FGI) performance can be maintained at the level of 34nm technology...
When a small figure is presented in human peripheral vision, it becomes invisible and invaded by surrounding texture, within a few seconds. This visual illusion is called perceptual filling-in. Time to filling-in (filling-in time) is varied by the properties of small figure, surround texture and some experimental conditions. In our preliminary study (Yokota, IEEE/IC-EMBS 2005), we found that incomplete...
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, ??-ray radiated decay time and light yield. When they are irradiated by X-ray the luminescence appears at VUV region. Transmittances...
Functional possibilities of inorganic-organic hybrid scintillator; Pr: LuAG scintillator covered with plastic scintillator is demonstrated. When 6planes of Pr: LuAG scintillator cube are covered with practice scintillator (BC-499), 30% higher light output is observed.
Recent years, the mobile ad hoc networks (MANETs) research community has been very active. Thus, it is of growing importance to build distributed network applications on top of MANETs. DHT is known as a popular technique to build efficient distributed applications in the Internet. However, in MANETs, DHT needs to consider network traffics, moving of nodes and energy efficiency more carefully than...
Ga 25, 55, and 552 ppm doped, In 25, 53, and 141 ppm doped, Mg 1, 5, 10, 13 mol% doped ZnO thin film scintillators were grown by the Liquid Phase Epitaxy (LPE) method. Their transmittance, ??-ray induced emission spectra were evaluated. The transmittance reached to 80% at wavelength longer than 390 nm for all the crystals. Two emission lines appeared at 390 and 550 nm, due to the free and bound excitons,...
For high-sensitivity neutron measurement, we developed a phoswich detector consisting of LiYF4 (Ce 1%) and BGO crystals. Light outputs of LiYF4 excited from ??-ray (simulating neutron excitation) have the faster decay-time constant ??~50 ns, compared with that from the shielding BGO crystal (??~300 ns), and these waveforms output from a preamplifier are clearly distinguished each other. When the waveforms...
Eu doped LiCaAlF6 (Eu:LiCAF) single crystal with 2-inch in diameter was grown by Czochralski technique. The grown crystal was free from any visible inclusions or cracks. The neutron responses using 252Cf were compared with that of Li-glass (GS20, Saint-Gobain). The position dependence of light yield in Eu:LiCAF single crystal was measured and the average value was 9700 ?? 900 photons/neutron.
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