Columnar cesium iodide (CsI) and micro-hole arrays for use in gas avalanche detectors

I. J. Park, J. G. Kim, H. K. Kim, W. S. Hong, S. H. Han, V. Perez-Mendez, J. Kadyk, W. Wenzel, K. S. Joo

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations


The characteristics of a columnar CsI layer with gas multiplication was investigated by using beta rays from a 90Sr source. This layer is intended for use as the primary electron source in any gas avalanche microdetector to avoid severe performance loss by the oblique angle of the incident charged particle. It was initially thought that the columnar structure might provide a larger detection efficiency than a planar CsI layer, because of the many surface crossings of incident particle for the columnar geometry. The columnar CsI study was performed in a thin parallel-plane structure, which has a 50-500 μm gas gap between a columnar CsI cathode and metal anode. We discuss the secondary emission and electric fields in the columnar structure, and explain why, based upon field simulation and experimental results, this approach does not succeed in this case. New ideas are presented for driftless gas avalanche detectors insensitive to the angle of incidence.

Original languageEnglish
Pages (from-to)1820-1824
Number of pages5
JournalIEEE Transactions on Nuclear Science
Issue number6 I
StatePublished - Dec 2000
Event1999 Nuclear Science Symposium (NSS) - Seattle, WA, United States
Duration: 24 Oct 199930 Oct 1999


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