Low- level radiation measuring system using magnetically levitated electrode ionization chamber

T. Kawaguchi, K. Futagami, M. Matoba, G. Wakabayasi, N. Ikeda, Y. Uozumi, N. Yamanaka, M. Kaneko

Research output: Contribution to journalConference articlepeer-review


An automatic measuring system using an ionization chamber having a magnetic levitation electrode has been developed. To check the system performance, environmental radiations and natural 40K γ - rays have been measured. Results of measurements of environmental radiations confirm the system sensitivity to be high and stable, and those of 40K γ - rays show possibility of measurement of ultra-low level radiation even with an ionization chamber. Minimum detectable ionization current is 2.3 × 10 -17 A. It corresponds to 2.4n Gy/h and 0.0024 μ Sv/h. respectively in the absorbed dose and the dose equivalent rates. The developed system is useful for the monitor to measure the environmental dose rate.

Original languageEnglish
Pages (from-to)698-701
Number of pages4
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: Oct 16 2004Oct 22 2004

All Science Journal Classification (ASJC) codes

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


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