Influence of radiotherapy room shielding on ambient dose equivalent due to photons H(10)p and neutrons H(10)n in the patient’s plane

This study discusses a computer simulation for the equivalent ambient dose due to photons, H*(10)p, and neutrons, H*(10)n, in the patient's plane undergoing radiation therapy. A standard radiotherapy room with an additional shielding made by one lead or steel tenth-value layer was considered. A...

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Bibliographic Details
Published in:	Applied radiation and isotopes Vol. 181; p. 110095
Main Authors:	Mendes, Raphael M.S., Silva, Maria G., Rebello, Wilson F., Oliveira, Cláudio L., Stenders, Ricardo M., Medeiros, Marcos P.C., Braga, Kelmo L., Santos, Raphael F.G., Thalhofer, Jardel L., Andrade, Edson Ramos de
Format:	Journal Article
Language:	English
Published:	England Elsevier Ltd 01-03-2022
Subjects:	Computer Simulation Humans MCNPX Monte Carlo Method Neutrons Particle Accelerators Photons Radiation Protection - methods Radiometry - methods Radiotherapy Radiotherapy Dosage X-ray Neutrons X-ray Radiotherapy MCNPX
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Summary:	This study discusses a computer simulation for the equivalent ambient dose due to photons, H(10)p, and neutrons, H(10)n, in the patient's plane undergoing radiation therapy. A standard radiotherapy room with an additional shielding made by one lead or steel tenth-value layer was considered. A Varian 2100/2300 C/D linear accelerator head operating at 18 MV was modeled. Jaw openings of 5 cm × 5 cm, 10 cm × 10 cm, 20 cm × 20 cm, and 30 cm × 30 cm, as well as the multileaf collimator under eight different angles of gantry inclination, were also modeled. The use of steel in the shield generates a slightly raised average value of H(10)p (0.527%) compared to when using lead. This finding can be interpreted as that the use of lead or steel coating makes no difference to the additional shield calculations when only photons are considered. When considering the contribution to H(10)n, there is a significant difference (11.7% increase) for using lead compared to steel shielding. •Simulation of H(10)p on the patient plane allows assessing of additional shielding.•No difference for lead or steel additional shielding concerning photons.•Lead increases H(10) in comparison to steel.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-3 content type line 23 ObjectType-Review-1
ISSN:	0969-8043 1872-9800
DOI:	10.1016/j.apradiso.2021.110095