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

doi:10.1109/23.819258

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

Department of Materials Science and Engineering

Lawrence Berkeley National Laboratory

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

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 language	English
Pages (from-to)	1938-1942
Number of pages	5
Journal	IEEE Transactions on Nuclear Science
Volume	46
Issue number	6 PART 2
DOIs	https://doi.org/10.1109/23.819258
State	Published - 1999

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title = "Moisture proof columnar cesium iodide (CsI) layers for gas avalanche microdetectors",

abstract = "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.",

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AU - Kadyk, J.

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AB - 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.

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

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