DocumentCode :
340505
Title :
Moisture proof columnar cesium iodide (CsI) layers for gas avalanche microdetector
Author :
Park, I.J. ; Cho, H.S. ; Hong, W.S. ; Perez-Mendez, V. ; Kadyk, J.
Author_Institution :
Div. of Phys., Lawrence Berkeley Lab., CA, USA
Volume :
1
fYear :
1998
fDate :
1998
Firstpage :
96
Abstract :
Cesium iodide columnar layers having diameters of ≈3 μm, and with a wall spacing of ≈1 μm act as secondary electron emitters and can be used for detection of radiation: charged particles, X-rays and gamma rays. With a large enough electric field across the columnar layers, ≈400 μm in thickness, gas avalanche gain is evident when placed in a suitable gas, such as P10 or Ar-ethane mixtures. The cesium iodide columns are damaged by ambient moisture. This damage can be prevented by evaporating protecting layers of hydrocarbons, such as anthracene and stilbene or inorganic materials, such as HgI2. Columnar layers with 20 nm coatings of HgI2 yield more than 30,000 electrons on average when traversed by electrons from a 90 Sr beta source
Keywords :
caesium compounds; moisture; position sensitive particle detectors; solid scintillation detectors; 1 micron; 20 nm; 3 micron; Ar; Ar-ethane mixture; CsI; CsI layers; HgI2; P10; X-ray detection; anthracene; charged particle detection; columnar layers; gamma ray detection; gas avalanche gain; gas avalanche microdetector; moisture; stilbene; Electron guns; Gamma ray detection; Gamma ray detectors; Gamma rays; Hydrocarbons; Moisture; Protection; Radiation detectors; X-ray detection; X-ray detectors;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Nuclear Science Symposium, 1998. Conference Record. 1998 IEEE
Conference_Location :
Toronto, Ont.
ISSN :
1082-3654
Print_ISBN :
0-7803-5021-9
Type :
conf
DOI :
10.1109/NSSMIC.1998.774816
Filename :
774816
Link To Document :
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