Korean J Med Phys.  2009 Dec;20(4):308-316.

Evaluation the Output Dose of Linear Accelerator Photon Beams by Blind Test with Dose Characteristics of LiF:Mg,Cu,P TLD

Affiliations
  • 1Bio-Physics Medical Engineering, School of Medicine, Keimyung University, Korea.
  • 2Raidation Oncology, School of Medicine, The Catholic University, Daegu, Korea. hjlee@cu.ac.kr
  • 3Raidation Oncology, School of Medicine, Doonggook University, Gyeongju, Korea.
  • 4Raidation Oncology, School of Medicine, Keimyung University, Daegu, Korea.

Abstract

To achieve the accurate evaluation of given absorbed dose from output dose of linear accelerator photon beam through investigate the characteristics of LiF:Mg,Cu,P TLD powder. This experimental TL phosphor is performed with a commercial LiF:Mg,Cu,P powder (Supplied by PTW) and TL reader (LTM, France). The TLD was exposed to 6 MV X rays of linear accelerator photon beam with range 15 to 800 cGy in blind dose at two hospitals. The dose evaluation of TLD was through the experimental algorithms which were dose dependency, dose rate dependency, fading and powder weight dependency. The glow curve has shown the three peaks which are 110, 183 and 232 degrees of heating temperature and the main dosimetric peak showed highest TL response at 232 high temperature. In this experiments, the LiF:Mg,Cu,P phosphor has shown the 2.5 eV of electron trap energy with a second order. This experiments guided the dose evaluation accuracy is within 1% +2.58% of discrepancy. The TLD powder of LiF:Mg,Cu,P was analyzed to dosimetric characterists of electron captured energy and order by glow shape, and dose-TL response curve guided the accuracy within 1.0+2.58% of output dose discrepancy.

Keyword

LiF:Mg,Cu,P; TLD; Glow curve; Blind test
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