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Energy spectra, sources, and shielding considerations for neutrons generated by a flattening filter-free Clinac
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10.1118/1.2905029
/content/aapm/journal/medphys/35/5/10.1118/1.2905029
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/35/5/10.1118/1.2905029

Figures

Image of FIG. 1.
FIG. 1.

Measured neutron spectrum produced by a Varian 2100 accelerator operated at 18 MV with the flattening filter in place (FF) and with it removed (FFF).

Tables

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TABLE I.

Properties of neutron fields produced by a Varian 2100 accelerator operated with the flattening filter present (FF) and flattening filter-free (FFF).

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TABLE II.

Spot-checking validation of the Monte Carlo model with the flattening filter removed. Calculated and measured fluences generated by a closed field at different locations in the patient plane. Distances are in the in-plane direction; is in the direction toward the gantry, is away from the gantry.

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TABLE III.

(A–C) Sources of neutrons from an accelerator operated with the flattening filter (FF) and flattening filter-free (FFF). Absolute neutron contribution (abs.; neutrons per source electrons) as well as percent neutron contribution (%) are shown. “Closed field” refers to jaws and MLC closed, “clinical field” refers to jaws set to and MLC set to , “open field” refers to jaws set to and MLC retracted.

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/content/aapm/journal/medphys/35/5/10.1118/1.2905029
2008-04-21
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Energy spectra, sources, and shielding considerations for neutrons generated by a flattening filter-free Clinac
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/35/5/10.1118/1.2905029
10.1118/1.2905029
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