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A pragmatic approach to dosimetric audit in radiotherapy

S W Blake, MSc 1 and M P Casebow, MSc 2

1 Medical Physics and Clinical Engineering, Royal Devon and Exeter Healthcare NHS Trust, Barrack Road, Exeter EX2 5DW and 2 Department of Medical Physics, Derriford Hospital, Derriford Road, Plymouth PL6 8DH, UK



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  		Figure 1. Energy correction curve for low kilovoltage (kV) photons as a function of half value layer (HVL) in aluminium (Al).

 


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  		Figure 2. Energy correction curve for megavoltage (MV) photons as a function of Quality Index.

 


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  		Figure 3. Megavoltage phantom.

 


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  		Figure 4. (a) Electron phantom and (b) depth–dose curve, showing measurement positions.

 


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  		Figure 5. Electron intercomparison results as a function of nominal electron beam energy. DV, visiting centre dose measurement; DH, host centre dose measurement.

 




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