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Measurement of stray neutron doses inside the treatment room from a proton pencil beam scanning system
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SYSNO ASEP 0488861 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Measurement of stray neutron doses inside the treatment room from a proton pencil beam scanning system Author(s) Mojzeszek, N. (PL)
Farah, J. (FR)
Klodowska, M. (PL)
Ploc, Ondřej (UJF-V) RID, ORCID, SAI
Stolarczyk, L. (PL)
Waligorski, M. P. R. (PL)
Olko, P. (PL)Number of authors 7 Source Title Physica Medica. - : Elsevier - ISSN 1120-1797
Roč. 34, č. 2 (2017), s. 80-84Number of pages 5 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords secondary neutrons ; proton therapy ; pencil beam scanning systtems ; out-of-field doses ; stray neutron doses ; TEPC Subject RIV FP - Other Medical Disciplines OECD category Radiology, nuclear medicine and medical imaging Institutional support UJF-V - RVO:61389005 UT WOS 000395371000010 EID SCOPUS 85010549510 DOI 10.1016/j.ejmp.2017.01.013 Annotation Purpose: To measure the environmental doses from stray neutrons in the vicinity of a solid slab phantom as a function of beam energy, field size and modulation width, using the proton pencil beam scanning (PBS) technique.
Method: Measurements were carried out using two extended range WENDI-II rem-counters and three tissue equivalent proportional counters. Detectors were suitably placed at different distances around the RW3 slab phantom. Beam irradiation parameters were varied to cover the clinical ranges of proton beam energies (100-220 MeV), field sizes ((2 x 2)-(20 x 20) cm(2)) and modulation widths (0-15 cm).
Results: For pristine proton peak irradiations, large variations of neutron H*(10)/D were observed with changes in beam energy and field size, while these were less dependent on modulation widths. H*(10)/ D for pristine proton pencil beams varied between 0.04 mu Sv Gy(-1) at beam energy 100 MeV and a (2 x 2) cm(2) field at 2.25 m distance and 90 degrees angle with respect to the beam axis, and 72.3 mu Sv Gy(-1) at beam energy 200 MeV and a (20 x 20) cm(2) field at 1 m distance along the beam axis.
Conclusions: The obtained results will be useful in benchmarking Monte Carlo calculations of proton radiotherapy in PBS mode and in estimating the exposure to stray radiation of the patient. Such estimates may be facilitated by the obtained best-fitted simple analytical formulae relating the stray neutron doses at points of interest with beam irradiation parameters.Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2018
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