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Reference dosimetry at the Australian Synchrotron's imaging and medical beamline using free-air ionization chamber measurements and theoretical predictions of air kerma rate and half value layer
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10.1118/1.4803675
/content/aapm/journal/medphys/40/6/10.1118/1.4803675
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/6/10.1118/1.4803675

Figures

Image of FIG. 1.
FIG. 1.

Calculated energy spectra for the raw (dashed line) and filtered (solid line) x-ray beams on the IMBL for a wiggler gap of 15 mm and a magnetic field of 1.31 T. The total filter recipe was as follows: carbon (3.54 mm), aluminum (0.86 mm), copper (1.41 mm), and Be (0.35 mm). The calculated mean energy of the filtered beam was 61.4 keV.

Image of FIG. 2.
FIG. 2.

Schematic of the ion chamber assembly for the HVL measurements on the imaging and medical beamline. Dashed arrow indicates beam direction.

Image of FIG. 3.
FIG. 3.

Good agreement obtained between LEFAC-measured and Dose4IMBL-calculated dose rates in copper sheets. The error bars correspond to 2.9% for the LEFAC and ADC measurements, and 2.2% for the predicted air kerma rate.

Image of FIG. 4.
FIG. 4.

Ray sum transmission curves for copper showing good agreement between measured LEFAC and ADC chambers and theory (as predicted by Dose4IMBL). The ray sum uncertainties were 2.2% for theory, 2.9% for LEFAC and ADC measurements, and thickness uncertainties given by Eq. (11) .

Image of FIG. 5.
FIG. 5.

The electron loss correction factors for the ADC-105 ion chamber (solid line) and the LEFAC (dashed line) as a function of copper thickness (increasing mean energy). The ADC-105 ion chamber required considerable correction for electron loss owing to its design characteristics.

Tables

Generic image for table
TABLE I.

Estimate of relative uncertainties contributing to AKR measurements using the LEFAC and ADC ionization chambers.

Generic image for table
TABLE II.

LEFAC and ADC-measured HVLs compared to theoretical predictions.

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/content/aapm/journal/medphys/40/6/10.1118/1.4803675
2013-05-20
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Reference dosimetry at the Australian Synchrotron's imaging and medical beamline using free-air ionization chamber measurements and theoretical predictions of air kerma rate and half value layer
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/6/10.1118/1.4803675
10.1118/1.4803675
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