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Comment on “Comparison of secondary neutron dose in proton therapy resulting from the use of a tungsten alloy MLC or a brass collimator system” [Med. Phys. 38(11), 6248–6256 (2011)]
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10.1118/1.3694489
/content/aapm/journal/medphys/39/4/10.1118/1.3694489
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/39/4/10.1118/1.3694489

Figures

Image of FIG. 1.
FIG. 1.

(a) Neutron flux Φn from brass and tungsten alloy blocks and from brass block placed next to tungsten alloy collimator at 50 cm distance along the beam axis from downstream surface of a block. Proton beam energy is of 230 MeV. Flux was calculated by reproducing the geometry given in Diffenderfer et al. (Ref. 1) with FLUKA Monte Carlo code. (b) The neutron weighting factors from ICRP 60 (Ref. 10) and 103 (Ref. 11).

Tables

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TABLE I.

The percentage difference defined as between ambient dose equivalent from neutrons generated in tungsten alloy block only (pure geometry) in brass block with MLC upstream (UPenn geometry) and brass blocks irradiated by 230 MeV proton beam. Nearly 4% of proton beam is absorbed in MLC in UPenn geometry.

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/content/aapm/journal/medphys/39/4/10.1118/1.3694489
2012-04-03
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Comment on “Comparison of secondary neutron dose in proton therapy resulting from the use of a tungsten alloy MLC or a brass collimator system” [Med. Phys. 38(11), 6248–6256 (2011)]
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/39/4/10.1118/1.3694489
10.1118/1.3694489
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