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Lipowitz metal shielding thickness for dose reduction of 6–20 MeV electrons
Author(s) -
Purdy James A.,
Choi Myung C.,
Feldman Arnold
Publication year - 1980
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.594680
Subject(s) - electromagnetic shielding , electron , ionization chamber , linear particle accelerator , attenuation , materials science , dosimetry , atomic physics , metal , shielding effect , ionization , nuclear physics , physics , nuclear medicine , optics , ion , beam (structure) , medicine , quantum mechanics , metallurgy , composite material
The relative dose reduction by Lipowitz metal of 6 to 20 MeV electrons from a Varian Associates Clinac–20 linear accelerator has been measured using a parallel plate thin wall ionization chamber. Metal thicknesses required for a 5% attenuation level for a 10×10 cm 2 field are as follows: 6 MeV–2.3 mm, 9 MeV–4.4 mm, 12 MeV–8.5 mm, 16 MeV–18.0 mm, 20 MeV–25.0 mm.
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