Measurement of stray neutron doses inside the treatment room from a proton pencil beam scanning system

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F17%3A00488861" target="_blank" >RIV/61389005:_____/17:00488861 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.ejmp.2017.01.013" target="_blank" >http://dx.doi.org/10.1016/j.ejmp.2017.01.013</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ejmp.2017.01.013" target="_blank" >10.1016/j.ejmp.2017.01.013</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Measurement of stray neutron doses inside the treatment room from a proton pencil beam scanning system

Popis výsledku v původním jazyce

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. nnMethod: 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). nnResults: 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. nnConclusions: 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.

Název v anglickém jazyce

Measurement of stray neutron doses inside the treatment room from a proton pencil beam scanning system

Popis výsledku anglicky

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. nnMethod: 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). nnResults: 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. nnConclusions: 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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

30224 - Radiology, nuclear medicine and medical imaging

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physica Medica

ISSN

1120-1797

e-ISSN

—

Svazek periodika

34

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

5

Strana od-do

80-84

Kód UT WoS článku

000395371000010

EID výsledku v databázi Scopus

2-s2.0-85010549510