Investigations On the Performance of Polymer Gel Dosimeter for Radiation Therapy

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  • 放射線治療領域の線量測定におけるポリマーゲル線量計の有用性の評価
  • ホウシャセン チリョウ リョウイキ ノ センリョウ ソクテイ ニ オケル ポリマー ゲル センリョウケイ ノ ユウヨウセイ ノ ヒョウカ

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Abstract

Gel dosimeters are sensitive chemical dosimeters that aim at measuring the dose in three dimensions(3D). This study aims to evaluate the performance of a commercially available BANG® polymer gel. BANG® gels were irradiated using 6MV photon beams from 0.5Gy to 60Gy. The magnetic resonance(MR)spin-spin relaxation rate(R2=1/T2) of the protons indicates dose response and has a linear relationship to dose. The dose response curve by BANG® gel appeared approximately linear over the 0.5Gy and 20Gy region. The slope of the dose-R2 curve is 0.9s−1Gy−1, and the relative dose distribution can be reproduced with an overall uncertainty of about 2%. R2 was found to increase with increasing time after irradiation. BANG® gels are of comparable quality to MOSFET or PLD in terms of overall dosimetric accuracy and have the advantage of measuring continuous, cumulative 3D dose distributions.

Journal

  • RADIOISOTOPES

    RADIOISOTOPES 57 (3), 183-188, 2008

    Japan Radioisotope Association

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