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On the production of neutrons in laminated barriers for 10 MV medical accelerator rooms
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10.1118/1.2940192
/content/aapm/journal/medphys/35/7/10.1118/1.2940192
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/35/7/10.1118/1.2940192

Figures

Image of FIG. 1.
FIG. 1.

Diagram of the treatment room illustrating photon incidence on a laminated barrier, as showed by the MCNP geometry plotter. Dimensions are given in centimeters.

Image of FIG. 2.
FIG. 2.

Comparison of measured and calculated neutron spectra due to the incidence of 13.27 MeV gamma rays on lead. Measurements data are taken from Cardman (Ref. 15).

Image of FIG. 3.
FIG. 3.

Mesh tally depiction of the neutron fluence density around the treatment room, normalized per starting photon.

Image of FIG. 4.
FIG. 4.

Neutron fluence beyond barriers of various thicknesses of lead, for 10 and 15 MeV incident photons.

Image of FIG. 5.
FIG. 5.

Total, elastic, and inelastic neutron cross sections for natural lead (ENDF/B-6.4).

Image of FIG. 6.
FIG. 6.

Simulated photoneutron angular distribution for the 10 MV spectrum impinging on lead.

Image of FIG. 7.
FIG. 7.

Simulated photoneutron spectrum in the patient plane.

Image of FIG. 8.
FIG. 8.

Transmission curves for the neutron ambient dose equivalent normalized to 1 Gy of photon absorbed dose at the isocenter beyond a laminated barrier containing 1 tenth value layer of lead, for varying thicknesses of neutron shielding.

Tables

Generic image for table
TABLE I.

Threshold energy for photoneutron emission in metals.

Generic image for table
TABLE II.

Elemental densities of the materials considered in the simulations.

Generic image for table
TABLE III.

Neutron ambient dose equivalents outside the accelerator room, normalized to 1 Gy of photon absorbed dose at the isocenter for three thicknesses of lead positioned in one of three locations.

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/content/aapm/journal/medphys/35/7/10.1118/1.2940192
2008-06-24
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: On the production of neutrons in laminated barriers for 10 MV medical accelerator rooms
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/35/7/10.1118/1.2940192
10.1118/1.2940192
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