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Analysis of Neutron Production in Passively Scattered Ion-Beam Therapy

Title
Analysis of Neutron Production in Passively Scattered Ion-Beam Therapy
Authors
Heo, SeungukYoo, SeunghoonSong, YongkeunKim, EunhoShin, JaeikHan, SoorimJung, WongyunNam, SangheeLee, RenaLee, KitaeCho, Sungho
Ewha Authors
이레나조성호
SCOPUS Author ID
이레나scopus
Issue Date
2017
Journal Title
RADIATION PROTECTION DOSIMETRY
ISSN
0144-8420JCR Link1742-3406JCR Link
Citation
vol. 175, no. 3, pp. 297 - 303
Publisher
OXFORD UNIV PRESS
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
A new treatment facility for heavy ion therapy since 2010 was constructed. In the broad beam, a range shifter, ridge filter and multi leaf collimator (MLC) for the generation of the spread-out Bragg peak is used. In this case, secondary neutrons produced by the interactions of the ion field with beam-modifying devices (e.g. double-scattering system, beam shaping collimators and range compensators) are very important for patient safety. Therefore, these components must be carefully examined in the context of secondary neutron yield and associated secondary cancer risk. In this article, Monte Carlo simulation has been carried out with the FLUktuierende KAskade particle transport code, the fluence and distribution of neutron generation and the neutron dose equivalent from the broad beam components are compared using carbon and proton beams. As a result, it is confirmed that the yield of neutron production using a carbon beam from all components of the broad beam was higher than using a proton beam. The ambient dose by neutrons per heavy ion and proton ion from the MLC surface was 0.12-0.18 and 0.0067-0.0087 pSv, respectively, which shows that heavy ions generate more neutrons than protons. However, ambient dose per treatment 2 Gy, which means physical dose during treatment by ion beam, is higher than carbon beam because proton therapy needs more beam flux to make 2-Gy prescription dose. Therefore, the neutron production from the MLC, which is closed to the patient, is a very important parameter for patient safety.
DOI
10.1093/rpd/ncw306
Appears in Collections:
의학전문대학원 > 의학과 > Journal papers
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