Moisture proof columnar cesium iodide (CsI) layers for gas avalanche microdetectors

I. J. Park, H. S. Cho, W. S. Hong, V. Perez-Mendez, J. Kadyk

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Cesium iodide columnar layers having a diameter of ≃ 3 μm, and 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 argon-ethane mixtures. The cesium iodide columns are damaged by ambient moisture. This damage can be prevented by evaporating protective layers of insoluble, low boiling point inorganic materials, such as mercuric iodide. Columnar layers with 20 nm coatings of mercuric iodide yield more than 30,000 electrons on average when traversed by electrons from a 90Sr beta source.

Original languageEnglish
Pages (from-to)1938-1942
Number of pages5
JournalIEEE Transactions on Nuclear Science
Issue number6 PART 2
StatePublished - 1999


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