期刊
JOURNAL OF RADIATION RESEARCH
卷 56, 期 2, 页码 372-381出版社
OXFORD UNIV PRESS
DOI: 10.1093/jrr/rru106
关键词
Cerenkov light removal; plastic scintillator dosimetry; pulse counting mode; SOF dosimeter; Ir-192 brachytherapy
资金
- Ministry of Education, Culture, Sports, Science and Technology [19689025]
- Grants-in-Aid for Scientific Research [15K09984, 19689025] Funding Source: KAKEN
The scintillator with optical fiber (SOF) dosimeter consists of a miniature scintillator mounted on the tip of an optical fiber. The scintillator of the current SOF dosimeter is a 1-mm diameter hemisphere. For a scintillation dosimeter coupled with an optical fiber, measurement accuracy is influenced by signals due to Cerenkov radiation in the optical fiber. We have implemented a spectral filtering technique for compensating for the Cerenkov radiation effect specifically for our plastic scintillator-based dosimeter, using a wavelength-separated counting method. A dichroic mirror was used for separating input light signals. Individual signal counting was performed for high-and low-wavelength light signals. To confirm the accuracy, measurements with various amounts of Cerenkov radiation were performed by changing the incident direction while keeping the Ir-192 source-to-dosimeter distance constant, resulting in a fluctuation of <5%. Optical fiber bending was also addressed; no bending effect was observed for our wavelength-separated SOF dosimeter.
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