科研之友
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摘要
Even a microdose error in the high-energy region widely used in radiotherapy can have a great impact on patient treatment. Advances in precision measurement are needed, so there have been many studies on developing hardware for precision measurement. However, there have been few studies on X-ray conversion materials despite their low absorption efficiency. To improve low absorption, photoconductors with stopping power attributes against X-rays are being applied to the high-energy region. However, this results in charge trapping, which in turn increases the standard error for continuous incident X-ray. To confirm the potential of a metal oxide to reduce the standard error, the performances of pure HgI2 and mixed-oxide sensors were compared and analyzed in the present study. Ti-and Si-based metal oxides were used to represent mixed metal oxides, and the standard error was evaluated at a 95% confidence interval. The experimental results showed that HgI2 had an error of 1.52%, while the Si-based metal oxide had an error of 0.17%. These results confirmed the possibility of manufacturing a metal oxide detector for use in the high-energy region.
- 出版日期2016-9
