http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
New materials for glass-ceramic X-ray storage phosphors
A. Edgar,M. Secu,S. Schweizer,J. -M. Spaeth,G. V. M. Williams,J. Hamlin 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4
The development of transparent glass ceramics as X-ray storage phosphors and their advantages over their crystalline coun-terparts are briey reviewed. Measurements of conversion eciency, stimulation eciency, storage times, and optical transparencyare reported for the particular case of europium-doped uorobromozirconate glass, in which rubidium and lithium replace the usualsodium component fraction. Annealing at 280.C converts the as-prepared glass into a glassceramic which contains Rb2BaBr4 andRbBa2Br5 nano- and micro-crystallites. Only the RbBa2Br5 structure shows signicant photo-stimulated luminescence after X-irradiation, and the maximum storage phosphor eciency is 8% of that for the standard commercial storage phosphor BaFBr:Eu.
X-ray and UV induced photo-luminescence from RbCdF3:Mn2+
G.V.M. Williams,S. Schweizer,B. Henke,C. Dunford,A. Edgar 한국물리학회 2006 Current Applied Physics Vol.6 No.3
We report the results from photo-luminescence (PL) measurements on single crystal RbCdF3 doped with up to 1% Mn2+, before andafter X-ray and deep UV irradiation. The intensity of the Mn2+ PL emission at 560 nm increases with increasing X-ray or UV (<270 nm)excited by this broad band is observed to increase with increasing radiation dose, and no signicant decrease in the PL intensity isobserved after 2 weeks. High intensity bleaching in the wavelength range from 280 nm to 420 nm reduces the PL emission to the originallow pre-irradiated level. These observations suggest that RbCdF3:Mn2+ has potential as a dosimeter for X-rays and deep UV wave-lengths less than 270 nm. We nd that the PL intensity systematically increases with increasing Mn2+ concentration and there is no evi-dence of saturation for up to 1% Mn2+. This indicates that higher sensitivity could occur with even higher concentrations of Mn2+.
Technical design of an IH-type buncher for KoBRA at RAON
Hoeltermann H.,Ratzinger U.,Schweizer W.,Strehl D.,Schwarz M.,Haehnel H.,Tshoo Kyoungho,Ham C.,Kwak D.,Shin T. S.,Yoon D. 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.83 No.8
To satisfy the beam requirement of the KoBRA experiment (0.5 nsec in 1σ), rebunching is required in the energy range up to 15 A MeV and for particles with an A/q range from 1 to 7. In cooperation with IBS and Hanmac Corporation, BEVATECH proposed a five-gap IH-buncher cavity which has excellent bunching properties from 5 to 15 MeV/u. Main challenges in this project are the wide energy range and CW operation at RF power levels up to 20 kW. The cavity will offer an effective voltage amplitude of up to 1 MV. To provide the required cooling channels and cooling efficiency, the stems and drifttubes of this cavity will be 3D printed. This paper will discuss the technical design approach and give a status on the development of the buncher cavity.
Spatial resolution of a glass-ceramic X-ray storage phosphor
A. Edgar,G.V.M. Williams,S. Schweizer,J.-M. Spaeth 한국물리학회 2006 Current Applied Physics Vol.6 No.3
The spatial resolution of a glass-ceramic X-ray storage phosphor imaging plate has been measured using a scanned and focussed laserbeam. The glass ceramic comprises orthorhombic phase barium chloride crystals containing europium ions embedded in a uorozirco-nate glass matrix. The modulation transfer function extends to signicantly higher frequencies than for a commercial imaging plate basedmercial plate. The modulation transfer function has a bimodal character which we ascribe to component responses from the focussedlaser beam volume and from the surrounding scattering halo. A limitation on performance of this particular glass ceramic is the occur-rence of bubbles and other defects which scatter the read-out light beam and reduce the uniformity of the response.