摘要
We introduce an empirical formula to directly calculate the room scatter factor in the calibration of 192Ir HDR using a Farmer chamber. Compared to the data of Selvam et al (2001 Phys. Med. Biol. 46 2299), our formula is accurate to within 0.3%. Our method saves time because the room scatter can be obtained in one calculation rather than being deduced through a series of setups of different source-chamber distances. It could also be cost effective because a calibration jig might be no longer necessary. We only need to position the applicator and chamber at a fixed space in air and measure its distance. We also analysed the effects of two possible errors arising from ignoring the room scatter and the measurement error of the source-chamber distance. We recommend that the source-chamber distance should be at least 10 cm.
原文 | English |
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文章編號 | 023 |
頁(從 - 到) | 871-877 |
頁數 | 7 |
期刊 | Physics in Medicine and Biology |
卷 | 52 |
發行號 | 3 |
DOIs | |
出版狀態 | Published - 2007 2月 7 |
All Science Journal Classification (ASJC) codes
- 放射與超音波技術
- 放射學、核子醫學和影像學