246 research outputs found
Development of liquid xenon detectors for medical imaging
In the present paper, we report on our developments of liquid xenon detectors
for medical imaging, positron emission tomography and single photon imaging, in
particular. The results of the studies of several photon detectors
(photomultiplier tubes and large area avalanche photodiode) suitable for
detection of xenon scintillation are also briefly described.Comment: 13 pages, 5 figures, presented on the International Workshop on
Techniques and Applications of Xenon Detectors (Xenon01), ICRR, Univ. of
Tokyo, Kashiwa, Japan, December 3-4, 2001 (submitted to proceedings
GEM operation in double-phase xenon
http://www.sciencedirect.com/science/article/B6TJM-4T7F5JF-5/2/897502f8049abd8c2dd3dffc3821f0f
A survey of energy loss calculations for heavy ions between 1 and 100 keV
The original Lindhard-Scharff-Schi{\o}tt (LSS) theory and the more recent
Tilinin theory for calculating the nuclear and electronic stopping powers of
slow heavy ions are compared with predictions from the SRIM code by Ziegler.
While little discrepancies are present for the nuclear contribution to the
energy loss, large differences are found in the electronic one. When full ion
recoil cascade simulations are tested against the elastic neutron scattering
data available in the literature, it can be concluded that the LSS theory is
the more accurate.Comment: Presented at the 10th International Symposium on Radiation Physics,
17-22 September, 2006, Coimbra, Portugal; style corrections, small change to
fig.
Reflectance of Polytetrafluoroethylene (PTFE) for Xenon Scintillation Light
Gaseous and liquid xenon particle detectors are being used in a number of
applications including dark matter search and neutrino-less double beta decay
experiments. Polytetrafluoroethylene (PTFE) is often used in these detectors
both as electrical insulator and as a light reflector to improve the efficiency
of detection of scintillation photons. However, xenon emits in the vacuum
ultraviolet wavelength region (175 nm) where the reflecting properties of PTFE
are not sufficiently known.
In this work we report on measurements of PTFE reflectance, including its
angular distribution, for the xenon scintillation light. Various samples of
PTFE, manufactured by different processes (extruded, expanded, skived and
pressed) have been studied. The data were interpreted with a physical model
comprising both specular and diffuse reflections. The reflectance obtained for
these samples ranges from about 47% to 66% for VUV light. Fluoropolymers,
namely ETFE, FEP and PFA were also measured
Detection of Scintillation Light of Liquid Xenon with a LAAPD
First observation of liquid xenon scintillation due to alpha-particles and
gamma-rays with a large area avalanche photodiode immersed in the liquid is
reported. An energy resolution of 10% (FWHM) and a coincidence time resolution
of less then 1 ns (FWHM) were measured with 5.5 MeV alpha-particles and 511 keV
gamma-rays, respectively. The quantum efficiency of the photodiode for xenon
scintillation light (wavelength 178 nm) is estimated to be ~100%.Comment: 11 pages, 9 figures, to be published in Nuclear Instruments and
Method
- …