ＴＬＤ郵送法による高エネルギー放射線治療用Ｘ・γ線１１施設の基準点線量調査

DOI
  • 速水 昭宗
    大阪大学歯学部歯科放射線学講座
  • 井上 俊彦
    大阪大学医学部附属バイオメディカル教育研究センター集学放射線治療学研究部
  • 川越 康充
    大阪大学医学部附属病院放射線部
  • 渕端 孟
    大阪大学歯学部歯科放射線学講座

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タイトル別名
  • Mailed TLD dose intercomparison at a reference point of high energy photon beams among 11 institutions in Japan.

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説明

To perform the multi-institutional cooperative studies of radiation therapy for malignant diseases, standardization of absorbed dose among the paticipating institutions must be established. To this end, site visits and a mailed TLD program are necessary during the first phase of quality assurance (QA) program. In this study, we examined a mailed TLD program for dosimetric intercomparisons among 11 participating institutions.<BR>We use a mailed TLD system that consists of TLD-100TM extruded disks (4.5mm in diameter and 0.9mm thick, Harshaw/Bicron) in an irradiation container made of water equivalent plastics named tough-water TM (Kyoto Kagaku). These TLD disks are placed at 5 cm depth in a toughwater mini-phantom. The three irradiation containers and one mini-phantom were sent to 11 institutions. In each institution, an additional phantom of about 10cm thick is put under the mini-phantom to provide sufficient back-scatter. Two Gy of institutional stated dose is irradiated to the TLDs.<BR>TLD output was measured for 42 beames through standardized field size of 10 cm×10cm. Thirty-six TLD values out of 42 beam data fall within ± 3% difference between measured and institutional stated dose values. In the case of reused TLD, the measuring accuracy is seriously affected by the annealing procedures and its reproducibility. Thus, it is important to repeat annealing of TLD four or fiveltimes for initialization and also to select TLD by weight for better uniformity of sensitivity.<BR>It is clearly indicated that a mailed TLD program is easy to perform and necessary for QA program of multi-institutional cooperative study.

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