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Development of a wavelength-separated type scintillator with optical fiber (SOF) dosimeter to compensate for the Cerenkov radiation effect

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Title: Development of a wavelength-separated type scintillator with optical fiber (SOF) dosimeter to compensate for the Cerenkov radiation effect
Authors: Ishikawa, Masayori Browse this author →KAKEN DB
Nagase, Naomi Browse this author
Matsuura, Taeko Browse this author →KAKEN DB
Hiratsuka, Junichi Browse this author
Suzuki, Ryusuke Browse this author →KAKEN DB
Miyamoto, Naoki Browse this author →KAKEN DB
Sutherland, Kenneth Lee Browse this author →KAKEN DB
Fujita, Katsuhisa Browse this author
Shirato, Hiroki Browse this author →KAKEN DB
Keywords: Cerenkov light removal
plastic scintillator dosimetry
pulse counting mode
SOF dosimeter
Ir-192 brachytherapy
Issue Date: Mar-2015
Publisher: Oxford University Press
Journal Title: Journal of Radiation Research
Volume: 56
Issue: 2
Start Page: 372
End Page: 381
Publisher DOI: 10.1093/jrr/rru106
PMID: 25618136
Abstract: 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.
Type: article
Appears in Collections:国際連携研究教育局 : GI-CoRE (Global Institution for Collaborative Research and Education : GI-CoRE) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
保健科学院・保健科学研究院 (Graduate School of Health Sciences / Faculty of Health Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 石川 正純

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