Accurate Measurement of Doses in the Sample Chamber of a <SUP>137</SUP>Csγ-ray Irradiation Apparatus

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  • ABE Toshiaki
    Radioisotope Research Center, University of Occupational and Environmental Health
  • YAMAMOTO Hisao
    Radioisotope Research Center, University of Occupational and Environmental Health
  • NORIMURA Toshiyuki
    Department of Radiation Biology and Health, School of Medicine, University of Occupational and Environmental Health

Bibliographic Information

Other Title
  • <SUP>137</SUP>Csガンマ線照射装置の試料容器内線量の精密測定
  • 137Csガンマ線照射装置の試料容器内線量の精密測定
  • 137Cs ガンマセン ショウシャ ソウチ ノ シリョウ ヨウキ ナイセンリョウ ノ セイミツ ソクテイ

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Abstract

Dose rates in the sample chamber of a 137Cs γ-ray irradiation apparatus (Nordion International Inc., Gammacell 40 Exactor) were accurately measured using an ionization chamber dosimeter. The dose rates obtained were 5.2m－7.2% higher at the upper and lower planes than at the middle plane in the sample chamber. In the process of starting and stopping irradiation, the additional dose during the movement of the source (end effects) was evaluated to be 0.85－1.21% (average 1.05±0.05%) of that estimated from the steady dose rate for 1min. When the irradiation period was less than 1 min, it was necessary to make a correction for the end effects in order to keep the error in irradiation dose below 1%.

Journal

  • Journal of UOEH

    Journal of UOEH 21 (4), 323-329, 1999

    The University of Occupational and Environmental Health, Japan

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