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Neutron spectra and dose equivalents calculated in tissue for high-energy radiation therapy
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10.1118/1.3089810
/content/aapm/journal/medphys/36/4/10.1118/1.3089810
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/36/4/10.1118/1.3089810
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Monte Carlo model of accelerator, couch, vault, and tissue-equivalent phantom for scoring neutrons. Tally locations through the phantom are illustrated with arrows.

Image of FIG. 2.
FIG. 2.

Neutron fluence in arbitrary units (A.U.) as a function of depth in tissue with the phantom present or absent. Phantom surface was located at and negative depths refer to the fluence in air above the phantom.

Image of FIG. 3.
FIG. 3.

Neutron energy spectra in A.U. from a Varian 2100 accelerator calculated at the same location relative to the treatment head in air and at 0.1 cm depth in tissue.

Image of FIG. 4.
FIG. 4.

Neutron energy spectra in A.U. at depths of 0.1, 1.5, 4.5, 9.5, and 19.5 cm in tissue.

Image of FIG. 5.
FIG. 5.

Average neutron energy as a function of depth in tissue.

Image of FIG. 6.
FIG. 6.

Neutron quality factor as a function of depth in tissue.

Image of FIG. 7.
FIG. 7.

Dose equivalent as a function of distance from the central axis calculated at the phantom surface for field sizes of , , and .

Image of FIG. 8.
FIG. 8.

Dose equivalent as a function of distance from the central axis calculated at the surface for SSDs of 90, 100, and 110 cm.

Image of FIG. 9.
FIG. 9.

Neutron PDDE curves for neutrons incident on a phantom at 100 or 90 cm SSD from a treatment field either or and measured either on the central axis (0), at 25 cm, or at 45 cm away from the central axis. Legend: SSD, field size, distance from the central axis.

Image of FIG. 10.
FIG. 10.

Neutron PDDE curves interpolated from D’Errico et al. (Ref. 15) for 0.24 MeV monoenergetic neutrons normally incident on water (“0.24 MeV”) and based on data from the current study for polyenergetic neutrons produced by a medical accelerator and scattered throughout a treatment vault incident at all angles on tissue (“Spectrum”).

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/content/aapm/journal/medphys/36/4/10.1118/1.3089810
2009-03-19
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Neutron spectra and dose equivalents calculated in tissue for high-energy radiation therapy
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/36/4/10.1118/1.3089810
10.1118/1.3089810
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