Design of guard ring geometry in thimble type ionization chamber

Yong Kyun Kim, Se Hwan Park, Han Soo Kim, Sang Mook Kang, Seung Yeoun Cho

Research output: Contribution to journalConference articlepeer-review


We designed and fabricated a thimble type ionization chamber with the guard-ring electrode. During the measurement, the potential between the guard electrode and the collecting electrode can be drifted, which will change the active volume of the ionization chamber. From MAXWELL and Garfield calculation, the variation of the active volume of the ionization chamber was obtained with changing the potential difference between the collector and guard electrode. We made ionization chambers with two designs of the guard ring. The polarity effect of two ion chamber was measured, and the result of it shows the consistency with the simulation.

Original languageEnglish
Pages (from-to)520-522
Number of pages3
JournalIEEE Nuclear Science Symposium Conference Record
Publication statusPublished - 2004
Event2004 Nuclear Science Symposium, Medical Imaging Conference, Symposium on Nuclear Power Systems and the 14th International Workshop on Room Temperature Semiconductor X- and Gamma- Ray Detectors - Rome, Italy
Duration: 2004 Oct 162004 Oct 22

All Science Journal Classification (ASJC) codes

  • Radiation
  • Nuclear and High Energy Physics
  • Radiology Nuclear Medicine and imaging


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