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Lead shielding thickness for dose reduction of 7‐ to 28‐MeV electrons
Author(s) -
Giarratano Joseph C.,
Duerkes Robert J.,
Almond Peter R.
Publication year - 1975
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 - 10.1118/1.594205
Subject(s) - electromagnetic shielding , electron , reduction (mathematics) , dosimetry , materials science , nuclear physics , physics , nuclear medicine , medicine , mathematics , geometry , composite material
The relative percent dose reduction by lead of 7‐ to 18‐MeV electrons with a Siemens betatron and of 19‐ to 28‐MeV electrons with a Sagittaire linear accelerator has been measured with a thin‐wall buildup chamber for 6.3×6.3‐ and 10.5×10.5‐cm field sizes at the chamber position for the normal treatment source‐to‐skin distance (SSD) of each machine. The thickness of lead necessary to attenuate the open beam by 95–98% was then determined of 7‐ to 28‐MeV electrons. The required thickness of lead to attenuate 95% of the 7‐ to 28‐MeV electron beam ranged from 2.3 to 18 mm for the 6.3×6.3‐cm field and from 2.4 to 23 mm for the 10.5×10.5‐cm field, respectively. For 98% attenuation, thicknesses from 2.6 to 25.0 mm for the 6.3×6.3‐cm field and from 2.8 to 27.5 mm of lead for the 10.5×10.5‐cm field were necessary.