GafChromic MD-55: Investigated as a precision dosimeter
GafChromic MD-55: Investigated as a precision dosimeter
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DOI：
10.1118/1.598106
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发表时间：
1997-12-01
期刊：
影响因子：
3.8
通讯作者：
Cygler, J
中科院分区：
文献类型：
--
作者：
Klassen, NV;van der Zwan, L;Cygler, J
GafChromic MD-55是一种相当新的薄膜剂量计，当用电离辐射照射时，它会产生蓝色（λ（最大值）=676 nm）。吸光度的增加大致与吸收剂量成比例。在这项研究中，GafChromic MD-55用Co-60 γ射线辐照。使用双辐照方法，其中剂量计被给予未知剂量，然后是已知的校准剂量。使用该方法，GafChromic MD-55用于测量6戈伊附近的剂量，不确定度小于1%。结果发现，GafChromic MD-55的测量的光密度，如目前制造的，是由分析光的偏振，一个重要的考虑因素时，使用GafChromic MD-55作为精密剂量计的影响。发现GafChromic MD-55由七层组成。测量了整个剂量计和构成剂量计一部分的三个聚酯薄膜对偏振光的响应。(C)1997年美国医学物理学家协会。
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.