Lepton contamination and photon scatter produced by open field 18 MV X-ray beams in the build-up region
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Pages (from-to) | 103-107 |
Journal / Publication | Radiation Measurements |
Volume | 35 |
Issue number | 2 |
Publication status | Published - 2002 |
Link(s)
Abstract
18 MV X-ray beams used in radiotherapy have skin sparing properties as they produce a dose build-up effect whereby a smaller dose is delivered to the skin compared to dose at depth. Experimental results have shown that variations in the build-up dose significantly contribute to lepton contamination produced outside of the patient or the phantom in question. Monte Carlo simulations of 18 MV X-ray beams show that the surface dose contribution from in-phantom scatter alone is approximately 6% of the maximum dose. The contribution to dose from lepton contamination is found by comparison of Monte Carlo phantom photon scatter dose only and experimental data. Results show that the percentage contributions to dose from lepton contamination are approximately, 65%, 90% of dose at 0.05 mm (basal cell layer), 52%, 79% at 1 mm depth (dermal layer) and 15%, 26% at 10 mm depth (subcutaneous tissue) for 10 cm × 10 cm2 and 40 cm × 40 cm2 fields, respectively. © 2002 Published by Elsevier Science Ltd.
Research Area(s)
- Build-up effect, Photon beams, Skin dose
Citation Format(s)
Lepton contamination and photon scatter produced by open field 18 MV X-ray beams in the build-up region. / Butson, Martin J.; Cheung, Tsang; Yu, Peter K.N.
In: Radiation Measurements, Vol. 35, No. 2, 2002, p. 103-107.
In: Radiation Measurements, Vol. 35, No. 2, 2002, p. 103-107.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review