胶片剂量仪与半导体探测器在小野剂量数据测量中的比较分析

doi:10.3969/j.issn.1000-1158.2020.07.18

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Abstract For precise radiotherapy, especially stereotactic radiotherapy and intensity-modulated radiotherapy, the small irradiation field modeling data is particularly important. The tissue maximum dose ratio, the profile, point dose and total scattering factor Scp were measured and calculated under the condition of the accelerator with 6MV photons, using the film and diode detector, with 0.01cm³in IBA Blue Phantom 2 tank and solid water, measuring the irradiation field of 0.6cm×0.6cm～10.0cm×10.0cm. The results showed: For percentage depth dose (PDD) curves, the measured data of digital diode detector and film in built-up area were basically consistent in different exposure fields, and there was a small deviation in the measurement results in water depth of 2～10cm, with a significant difference after water depth of 10cm (almost 0.07). For the profile curve, there was no significant difference between the measured data of film and finger diode detector under different irradiation fields. Conclusions were drawn as follows: (1)For different measuring probe, the accuracy of the physical measurements may differ greatly.(2)Film dosimeter has superior spatial resolution, but film absorbed dose range is limited, energy and directional are dependenced.

Key words： metrology small field dosimetry small radiation field percentage depth dose diode detector film dosimeter tissue maximum ratio

Received: 24 July 2019 Published: 29 June 2020

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TB98

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	GAO Xiang
	YU Yan-juan
	SHI Li-wan

Cite this article:

GAO Xiang,YU Yan-juan,SHI Li-wan. Comparative Analysis of Film Dosimeter and Diode Detector in Small Field Dosimetry[J]. Acta Metrologica Sinica, 2020, 41(7): 873-878.

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2020.07.18 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2020/V41/I7/873

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