Validating Fricke dosimetry for the measurement of absorbed dose to water for HDR 192Ir brachytherapy: a comparison between primary standards of the LCR, Brazil, and the NRC, Canada

被引:7
作者
Salata, Camila [1 ,2 ]
David, Mariano Gazineu [1 ]
de Almeida, Carlos Eduardo [1 ]
El Gamal, Islam [3 ]
Cojocaru, Claudiu [3 ]
Mainegra-Hing, Ernesto [3 ]
McEwen, Malcom [3 ]
机构
[1] Univ Estado Rio de Janeiro, Lab Ciencias Radiol, Rio De Janeiro, RJ, Brazil
[2] Brazilian Nucl Energy Comiss, CNEN, Rio De Janeiro, RJ, Brazil
[3] Natl Res Council Canada, Measurement Sci & Stand, Ottawa, ON, Canada
关键词
Fricke dosimetry; Ir-192 HDR brachytherapy; absorbed dose to water; Monte Carlo simulations; WALL CORRECTION FACTORS; CO-60; GAMMA-RAYS; SOURCE CALIBRATION; PROSTATE-CANCER; X-RAYS; CHAMBERS;
D O I
10.1088/1361-6560/aab2b8
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
Two Fricke-based absorbed dose to water standards for HDR Ir-192 dosimetry, developed independently by the LCR in Brazil and the NRC in Canada have been compared. The agreement in the determination of the dose rate from a HDR Ir-192 source at 1 cm in a water phantom was found to be within the k = 1 combined measurement uncertainties of the two standards: D-NRC/D-LCR = 1.011, standard uncertainty = 2.2%. The dose-based standards also agreed within the uncertainties with the manufacturer's stated dose rate value, which is traceable to a national standard of air kerma. A number of possible influence quantities were investigated, including the specific method for producing the ferrous-sulphate Fricke solution, the geometry of the holder, and the Monte Carlo code used to determine correction factors. The comparison highlighted the lack of data on the determination of G(Fe3+) in this energy range and the possibilities for further development of the holders used to contain the Fricke solution. The comparison also confirmed the suitability of Fricke dosimetry for Ir-192 primary standard dose rate determinations at therapy dose levels.
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页数:12
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