Effect of Electromagnetic Field in Fusion Facility on Electronic Personal Dosimeter

DOI Web Site 19 References
  • YAMADA Junya
    National Institute for Fusion Science, Safety and Environmental Research Center
  • KAWANO Takao
    National Institute for Fusion Science, Safety and Environmental Research Center
  • UDA Tatsuhiko
    National Institute for Fusion Science, Safety and Environmental Research Center
  • SHIMO Michikuni
    Fujita Health University, School of Health Sciences

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Other Title
  • 電子ポケット線量計に対する核融合施設電磁場の影響
  • デンシ ポケットセンリョウケイ ニ タイスル カク ユウゴウ シセツ デンジバ ノ エイキョウ

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Abstract

The effect of electromagnetic field on electronic personal dosimeters in a nuclear fusion facility was examined in a Magnetic Resonance Imaging (MRI) examination room instead of a nuclear fusion facility. Three types of electronic personal dosimeters, the PDM-111, the 112, and the 117, were used as typical ones. We surveyed the electromagnetic field distribution and dosimeters were placed at locations with various strengths of the electromagnetic field. The natural radiation dose was measured for about one week. We found that while dosimeters were not affected by the electric field, they were affected by the magnetic one. Dosimeters detected radiation levels less sensitively as the magnetic field strength was increased up to 150 mT. The dosimeters underestimated the environmental radiation dose rates by about 10-30% when the magnetic field strength was larger than 150 mT. We assumed that hall-effect caused the reduction in radiation sensitivity. We concluded that the strength of the magnetic field needs to be carefully considered when an electronic personal dosimeter is used for monitoring both personal and area dose in a nuclear fusion facility.

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