2009年
A feasibility study on multi prompt-gamma-ray telescope system for boron neutron capture therapy
IFMBE Proceedings
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- 巻
- 25
- 号
- 1
- 開始ページ
- 470
- 終了ページ
- 473
- 記述言語
- 英語
- 掲載種別
- DOI
- 10.1007/978-3-642-03474-9-131
We are improving the dose simulation system for boron neutron capture therapy (BNCT) and constructing the on-line dose-estimation technique using the prompt gammaray telescope system. Our present telescope system counts the prompt gamma rays from hydrogen which uniformly distributes in human body, and from boron-10 which locally distributes in target volume. However, this system cannot get the detail information for several changes of counting rates according to the motions and shape-changes of target volume only using the mono-energetic gamma rays. Then, we are studying the "multi prompt-gamma-ray telescope system" utilizing gadolinium-157 (157Gd). The reaction of 157Gd with neutron generates the prompt gamma rays of several energies, to approximately 8 MeV in maximum. By the comparison of the counts for these gamma rays, the information for the depth direction in human body can be obtained, because the attenuation coefficient in human body varies according to the gammaray energy. For this system, the fundamental phantom-experiments were performed at the epi-thermal neutron irradiation field which was applied to the actual BNCT irradiation. For the 157Gd-concentration, the lower detection-limit was almost 1,000 ppm at the small volume of 1 cm3. This is due to the detection-limit for 6.75-MeV gamma ray, because its detection efficiency is smaller. From the experimental results, the feasibility and the limit of this system could be confirmed. © 2009 Springer-Verlag.
- ID情報
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- DOI : 10.1007/978-3-642-03474-9-131
- ISSN : 1680-0737
- SCOPUS ID : 77950376855