DocumentCode :
1702060
Title :
Absolute number of scintillation photons emitted by alpha-particles in rare gases
Author :
Saito, K. ; Sasaki, S. ; Tawara, H. ; Shibamura, E.
Author_Institution :
Graduated Univ. for Adv. Studies, Ibaraki, Japan
Volume :
1
fYear :
2001
Firstpage :
333
Abstract :
In order to determine absolute scintillation yields due to alpha particles in high pressure rare gases, the number of scintillation photons Np was measured by using a VUV sensitive photodiode (PD) with a MgF2 window and a Cs-Te photocathode with spectral quantum efficiency qe(λ) measured as a function of wavelength λ. The number of photoelectrons from the photocathode Npe was measured absolutely by using charge-sensitive preamplifier calibrated in numbers of electrons. A collection efficiency Fce at the photocathode for scintillation photons can be determined from solid angles subtended by the photocathode at a scintillation point under the condition that there is no photon reflected at surrounding wall. Then, Np was determined from Np=Npe/(QeFce), where Qe is effective quantum efficiency calculated from qe(λ) and a relative intensity I(λ) of scintillation in rare gases at wavelength λ. Although luminescence spectrums from rare gases emitted by radiation have been measured by many researchers, these spectrums were scarcely corrected by an efficiency of apparatus (e.g. efficiency of monochromator and scintillation detector) for λ. In order to exactly determine the luminescence spectrums, these were also measured on our own terms. And, since it was reported that scintillation intensity from rare gases change with a pressure of rare gases, this experiments was carried out in a pressure range from 1.0×105 Pa to 1.0×106 Pa. The measurements were carried out in gaseous argon, krypton and xenon. In xenon of 1.0×105 Pa, Np was measured to be 1.6×105.
Keywords :
alpha-particle detection; calibration; gas scintillation detectors; nuclear electronics; photocathodes; photodiodes; preamplifiers; 1E5 to 1E6 Pa; Ar; Cs-Te; Kr; MgF2; VUV sensitive photodiode; Xe; alpha-particles; calibration; charge-sensitive preamplifier; photocathode; rare gases; scintillation photons; spectral quantum efficiency; Alpha particles; Cathodes; Gases; Luminescence; Particle measurements; Photodiodes; Pressure measurement; Q measurement; Wavelength measurement; Xenon;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Nuclear Science Symposium Conference Record, 2001 IEEE
ISSN :
1082-3654
Print_ISBN :
0-7803-7324-3
Type :
conf
DOI :
10.1109/NSSMIC.2001.1008470
Filename :
1008470
Link To Document :
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