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 [in Japanese] Investigations on the Performance of Polymer Gel Dosimeter for Radiation Therapy [in Japanese]
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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<SUP>®</SUP> polymer gel. BANG<SUP>®</SUP> gels were irradiated using 6MV photon beams from 0.5Gy to 60Gy. The magnetic resonance(MR)spin-spin relaxation rate(R<SUB>2</SUB>=1/T<SUB>2</SUB>) of the protons indicates dose response and has a linear relationship to dose. The dose response curve by BANG<SUP>®</SUP> gel appeared approximately linear over the 0.5Gy and 20Gy region. The slope of the dose-R<SUB>2</SUB> curve is 0.9s<SUP>−1</SUP>Gy<SUP>−1</SUP>, and the relative dose distribution can be reproduced with an overall uncertainty of about 2%. R<SUB>2</SUB> was found to increase with increasing time after irradiation. BANG<SUP>®</SUP> 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.
RADIOISOTOPES 57(3), 183-188, 2008-03-15
Japan Radioisotope Association