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On the property of measurements with the PTW microLion chamber in continuous beams
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10.1118/1.4736804
/content/aapm/journal/medphys/39/8/10.1118/1.4736804
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/39/8/10.1118/1.4736804

Figures

Image of FIG. 1.
FIG. 1.

(Left) The measurement geometry and experimental setup used for the experiments with 18F. (Middle, right) Schematic and exploded view drawing of the experimental setup, showing the LIC and NACP-02 chamber configuration in relation to the glass vial container for the activity of 18F.

Image of FIG. 2.
FIG. 2.

Measurement results for the LIC containing isooctane operated at 300 and 500 V chamber polarizing voltage, and the NACP-02 chamber in the hot cell. The results for the LICs and the NACP-02 chamber are indicated by solid and dashed lines, respectively. Figures on the right hand side are showing the LIC perturbations on a more detailed scale.

Image of FIG. 3.
FIG. 3.

(Top row) Measurement results from the LIC containing isooctane operated at 300 and 500 V chamber polarizing voltage, and the recorded temperature variations in the hot cell. The measurement results from the LIC and the temperature variations are indicated by thick and thin lines, respectively. (Bottom row) Variations of the electric field in the hot cell, as measured by the C.A 42 instrument, and manually correlated examples of the LIC measurement results for 300 and 500 V chamber polarizing voltage. Measurements of the ambient electric fields were performed separately from the ion chamber experiments. The measurement results from the LIC and the ambient electric field variations are indicated by solid thick lines and dotted lines, respectively.

Image of FIG. 4.
FIG. 4.

Corrected LIC to NACP-02 ratios for isooctane and tetramethylsilane for the LIC polarizing voltages and dose rates used in the present work. The dashed line indicates the mean LIC to NACP-02 chamber ratio. The corrected LIC to NACP-02 ratios are given with one standard deviation.

Image of FIG. 5.
FIG. 5.

A comparison of the theoretical collection efficiency according to Greening (∇) and the experimental collection efficiency according to the two-dose-rate method (Ο) for isooctane and tetramethylsilane at the different LIC polarizing voltages and dose rates in the present work.

Image of FIG. 6.
FIG. 6.

A comparison of experimentally determined general collection efficiencies according to the two-dose-rate method for 120 kVp x ray (∇), and 511 keV annihilation photons (Ο). The collection efficiencies are displayed as a function of the ionization current corrected for general recombination, i.e., the ionization current escaping initial recombination.

Tables

Generic image for table
TABLE I.

General collection efficiencies, f, determined according to the two-dose-rate method for the LIC containing isooctane at different polarizing voltages and dose rates. Values in the parentheses represent one relative standard deviation expressed as a percentage.

Generic image for table
TABLE II.

General collection efficiencies, f, determined according to the two-dose-rate method for the LIC containing tetramethylsilane at different polarizing voltages and dose rates. Values in the parentheses represent one relative standard deviation expressed as a percentage.

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/content/aapm/journal/medphys/39/8/10.1118/1.4736804
2012-07-19
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: On the property of measurements with the PTW microLion chamber in continuous beams
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/39/8/10.1118/1.4736804
10.1118/1.4736804
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