Effects of changes in stopping-power ratios with field size on electron beam relative output factors

Stopping-power ratios are a function of field size and vary with accelerators. To investigate how these variations affect relative output factor measurements made using ion chambers for electron beams, especially for small fields, (L̄/ρ) air water is calculated using the Monte Carlo technique for di...

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Veröffentlicht in:	Medical physics (Lancaster) 1998-09, Vol.25 (9), p.1711-1716
Hauptverfasser:	Zhang, G. G., Rogers, D. W. O., Cygler, J. E., Mackie, T. R.
Format:	Artikel
Sprache:	eng
Schlagworte:	87.53.04 87.55.03 Accelerators Biophysical Phenomena Biophysics Collisional energy loss dosimetry Dosimetry/exposure assessment electron accelerators Electron and positron beams electron beams Electrons - therapeutic use Field size Gas‐filled counters: ionization chambers, proportional, and avalanche counters Humans ionisation chambers Ionization chambers Monte Carlo Method Particle Accelerators Phantoms, Imaging Physicists radiation therapy Radiation therapy equipment Radiometry - instrumentation Radiotherapy Planning, Computer-Assisted - statistics & numerical data Radiotherapy, High-Energy Technology, Radiologic Water vapor
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