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Microionization chamber air-kerma calibration coefficients as a function of photon energy for x-ray spectra in the range of 20–250 kVp relative to 60Co
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10.1118/1.4794491
/content/aapm/journal/medphys/40/4/10.1118/1.4794491
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/4/10.1118/1.4794491

Figures

Image of FIG. 1.
FIG. 1.

Normalized air-kerma calibration coefficients, N K, measured with ionization chambers biased to (a) −300 V (positive charge collection) and (b) +300 V (negative charge collection) for x-ray beams with effective energies ranging from 11.5 to 145 keV. The material specification next to each chamber model in the legend denotes the collecting electrode material. The uncertainty at the k = 2 level for the N K measurements was 1.5%.

Image of FIG. 2.
FIG. 2.

Normalized air-kerma calibration coefficients, N K, measured with the proof-of-concept low-Z microchamber biased to +300 V (negative charge collection) for photon beams with effective energies ranging from 19.8 to 145 keV. Each N K value is normalized to the N K value measured in the M250 beam during each measurement set. The uncertainty at the k = 2 level for the N K measurements was 1.5%.

Tables

Generic image for table
TABLE I.

Each ionization chamber model used in this work and the corresponding collecting volume, the inner diameter (ID) and outer diameter (OD) of the wall, the OD of the collecting electrode, and the thickness of the build-up cap. The materials are PMMA, graphite (Gr), aluminum (Al), air equivalent plastic (C552), steel, and silver-plated copper-clad steel (SPC).

Generic image for table
TABLE II.

Beam code (Ref. 15 ) first HVL, homogeneity coefficient, and effective energy of the x-ray beams used in this work. The effective energy is an estimate of the monoenergetic photon energy that gives the same first HVL as the polyenergetic spectrum (Ref. 16 ).

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/content/aapm/journal/medphys/40/4/10.1118/1.4794491
2013-03-18
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Microionization chamber air-kerma calibration coefficients as a function of photon energy for x-ray spectra in the range of 20–250 kVp relative to 60Co
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/40/4/10.1118/1.4794491
10.1118/1.4794491
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