Experimental study of attenuation properties of normoxic polymer gel dosimeters

被引：56
作者：
Brindha, S [1 ]
Venning, AJ
Hill, B
Baldock, C
机构：
[1] Christian Med Coll & Hosp, Dept Radiat Oncol, Vellore 632004, Tamil Nadu, India
[2] Queensland Univ Technol, Sch Phys & Chem Sci, Brisbane, Qld 4001, Australia
[3] Canberra Hosp, Med Phys Sect, Biomed Engn Serv, Woden, ACT 2606, Australia
[4] Univ Sydney, Inst Med Phys, Sydney, NSW 2006, Australia
来源：
PHYSICS IN MEDICINE AND BIOLOGY | 2004年 / 49卷 / 20期
关键词：
D O I：
10.1088/0031-9155/49/20/N01
中图分类号：
R318 [生物医学工程];
学科分类号：
0831 ;
摘要：
The change in linear attenuation coefficient with absorbed dose has been investigated for aqueous polyacrylamide, gelatine and tetrakis (PAGAT) and aqueous methacrylic acid, gelatine and tetrakis (MAGAT) normoxic polymer gel dosimeters using tetrakis (hydroxy methyl) phosphonium chloride as the antioxidant. The measured linear attenuation coefficient increased linearly with absorbed dose up to 15 Gy for PAGAT gels and 10 Gy for MAGAT gels. Computerized tomography (CT) numbers or Hounsfield units (H) were calculated from the linear attenuation coefficients and compared with values obtained using a CT scanner. Both calculated and measured CT numbers followed a similar pattern when fitted with a biexponential curve. The CT numbers obtained from linear attenuation measurements were found to be greater than that obtained with the CT scanner for both PAGAT and MAGAT polymer gels. The H-dose sensitivities of the MAGAT and PAGAT polymer gel dosimeters measured on a CT scanner were calculated to be (0.85 +/- 0.08) H Gy(-1) and (0.31 +/- 0.03) H Gy(-1), respectively. The H-dose sensitivities of the MAGAT and PAGAT polymer gel dosimeters from attenuation measurements were found to be (1.10 +/- 0.66) H Gy(-1) and (0.34 +/- 0.01) H Gy(-1), respectively.
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页码：N353 / N361
页数：9
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