GafChromic MD-55: Investigated as a precision dosimeter

被引:164
作者
Klassen, NV [1 ]
van der Zwan, L
Cygler, J
机构
[1] Natl Res Council Canada, Inst Natl Measurement Stand, Ionizing Radiat Stand Grp, Ottawa, ON K1A 0R6, Canada
[2] Ottawa Reg Canc Ctr, Civ Div, Ottawa, ON K1Y 4K7, Canada
关键词
radiochromic film; GafChromic MD-55; ionizing radiation dosimetry; polarized light;
D O I
10.1118/1.598106
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
GafChromic MD-55 is a fairly new, thin film dosimeter that develops a blue color (lambda(max)=676 nm) when irradiated with ionizing radiation. The increase in absorbance is roughly proportional to the absorbed dose. In this study, GafChromic MD-55 was irradiated with Co-60 gamma rays. A double irradiation method was used in which a dosimeter is given an unknown dose followed by a known, calibration dose. With this method, GafChromic MD-55 was used to measure doses in the vicinity of 6 Gy with an uncertainty of less than 1%. It was found that the measured optical density of GafChromic MD-55, as presently fabricated, is affected by the polarization of the analyzing light, an important consideration when using GafChromic MD-55 as a precision dosimeter. GafChromic MD-55 was found to consist of seven layers. The response to polarized light was measured for the whole dosimeter and for the three Mylar films which form part of the dosimeter. (C) 1997 American Association of Physicists in Medicine.
引用
收藏
页码:1924 / 1934
页数:11
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