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Response to high-energy photons of PTW31014 PinPoint ion chamber with a central aluminum electrode
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10.1118/1.2940190
/content/aapm/journal/medphys/35/7/10.1118/1.2940190
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/35/7/10.1118/1.2940190

Figures

Image of FIG. 1.
FIG. 1.

Cross-plane profiles measured at for 5, 10, and 20 cm square fields with type 31014 PinPoint (cross lines) and Semiflex (solid lines) ion chambers. Chamber axis is parallel to scan direction to evidence stem effect.

Image of FIG. 2.
FIG. 2.

Saturation curves for type 31014 PinPoint chamber at a 10 cm depth for the field. The dotted curve is the linear fit of data between 150 and 50 V. At 400 V the collected charge is greater than the saturation value .

Image of FIG. 3.
FIG. 3.

Polarity correction factor at a 10 cm depth as a function of field size for type 31014 PinPoint chamber. 6 MV (circle solid line), 15 MV (square dashed line).

Image of FIG. 4.
FIG. 4.

Polarity-corrected (◻) vs. uncorrected (▲) relative response of type 31014 PinPoint chamber for the 6 and 15 MV beams at a 10 cm depth.

Image of FIG. 5.
FIG. 5.

Uncorrected relative response of type 31014 PinPoint chamber for 6 and 15 MV beams as a function of depth ( and 5, 10, and 20 cm) and field size.

Image of FIG. 6.
FIG. 6.

Depth dose curves for the 2, 5, 10, 20, and 40 cm square fields with type 31014 PinPoint (cross lines) and Semiflex (solid lines) ion chambers. Top right box: zoom of the build-up region.

Image of FIG. 7.
FIG. 7.

Cross-plane profiles measured at for the square field with type 31014 PinPoint chamber, Semiflex (empty circle) chamber and EDR2 film (solid circle).

Tables

Generic image for table
TABLE I.

Ionization chambers and their properties.

Generic image for table
TABLE II.

Penumbra measured with different detectors for the 6 and 15 MV beams.

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/content/aapm/journal/medphys/35/7/10.1118/1.2940190
2008-06-24
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Response to high-energy photons of PTW31014 PinPoint ion chamber with a central aluminum electrode
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/35/7/10.1118/1.2940190
10.1118/1.2940190
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