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Influence of field size on a PTW type 23342 plane-parallel ionization chamber’s response
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10.1118/1.1819554
/content/aapm/journal/medphys/31/12/10.1118/1.1819554
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/31/12/10.1118/1.1819554

Figures

Image of FIG. 1.
FIG. 1.

Irradiation setup.

Image of FIG. 2.
FIG. 2.

Ratios between chamber’s readings in air and in phantom for radiation field diameters between 30 and and for tube potentials between 30 and .

Image of FIG. 3.
FIG. 3.

Change in chamber’s readings in air for tube potential of as the radiation field diameter is increased from 30 to . Data normalized so that readings are equal to unity for .

Image of FIG. 4.
FIG. 4.

Change in chamber’s readings in phantom for tube potentials between 30 and as the radiation field diameter is increased from 30 to . Data normalized so that readings are equal to unity for .

Tables

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TABLE I.

X-ray qualities and mass-energy absorption coefficients used to evaluate the response of a PTW type 23342 plane-parallel ionization chamber with field size. Values of kerma rate were obtained with the PTW chamber. (Adapted from Ref. 7.)

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TABLE II.

Backscatter factors for low-energy x-rays as a function of half-value layer for different field sizes (Ref. 8).

Generic image for table
TABLE III.

Relative increase in the backscattering when the field size is increased from 30 to .

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/content/aapm/journal/medphys/31/12/10.1118/1.1819554
2004-11-10
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Influence of field size on a PTW type 23342 plane-parallel ionization chamber’s response
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/31/12/10.1118/1.1819554
10.1118/1.1819554
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