Build up region of megavoltage photon radiation sources

D. E. Velkley; D. J. Manson; J. A. Purdy; G. D. Oliver

doi:10.1118/1.594158

Build up region of megavoltage photon radiation sources

D. E. Velkley, D. J. Manson, J. A. Purdy, G. D. Oliver

Department of Radiation Oncology

Research output: Contribution to journal › Article › peer-review

116 Scopus citations

Abstract

Measurements of surface dose and build up have been measured for photon radiation sources with maximum energy from 1.2 to 25 MeV. A variable volume ionization chamber was used and the results extrapolated to what would be obtained with a zero volume chamber. The results are found to depend systematically on the plate separation of a parallel plate ionization chamber and an empirical method was derived for correcting measurements made with a fixed volume chamber. The relationship of dose build up curves with skin reactions in radiation therapy patients is discussed.

Original language	English
Pages (from-to)	14-19
Number of pages	6
Journal	Medical physics
Volume	2
Issue number	1
DOIs	https://doi.org/10.1118/1.594158
State	Published - Jan 1975

Keywords

48.510
BIOLOGICAL RADIATION EFFECTS
BUILDUP
GAMMA DOSIMETRY
GAMMA SOURCES
RADIATION DOSES
RADIOTHERAPY
SKIN
X=(HYPHEN)=RAY DOSIMETRY
X=(HYPHEN)=RAY SOURCES

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title = "Build up region of megavoltage photon radiation sources",

abstract = "Measurements of surface dose and build up have been measured for photon radiation sources with maximum energy from 1.2 to 25 MeV. A variable volume ionization chamber was used and the results extrapolated to what would be obtained with a zero volume chamber. The results are found to depend systematically on the plate separation of a parallel plate ionization chamber and an empirical method was derived for correcting measurements made with a fixed volume chamber. The relationship of dose build up curves with skin reactions in radiation therapy patients is discussed.",

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author = "Velkley, {D. E.} and Manson, {D. J.} and Purdy, {J. A.} and Oliver, {G. D.}",

year = "1975",

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AU - Velkley, D. E.

AU - Manson, D. J.

AU - Purdy, J. A.

AU - Oliver, G. D.

PY - 1975/1

Y1 - 1975/1

N2 - Measurements of surface dose and build up have been measured for photon radiation sources with maximum energy from 1.2 to 25 MeV. A variable volume ionization chamber was used and the results extrapolated to what would be obtained with a zero volume chamber. The results are found to depend systematically on the plate separation of a parallel plate ionization chamber and an empirical method was derived for correcting measurements made with a fixed volume chamber. The relationship of dose build up curves with skin reactions in radiation therapy patients is discussed.

AB - Measurements of surface dose and build up have been measured for photon radiation sources with maximum energy from 1.2 to 25 MeV. A variable volume ionization chamber was used and the results extrapolated to what would be obtained with a zero volume chamber. The results are found to depend systematically on the plate separation of a parallel plate ionization chamber and an empirical method was derived for correcting measurements made with a fixed volume chamber. The relationship of dose build up curves with skin reactions in radiation therapy patients is discussed.

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KW - BIOLOGICAL RADIATION EFFECTS

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KW - GAMMA DOSIMETRY

KW - GAMMA SOURCES

KW - RADIATION DOSES

KW - RADIOTHERAPY

KW - SKIN

KW - X=(HYPHEN)=RAY DOSIMETRY

KW - X=(HYPHEN)=RAY SOURCES

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JO - Medical physics

JF - Medical physics

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ER -

Build up region of megavoltage photon radiation sources

Abstract

Keywords

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