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The energy response of agar-alanine phantom dosimeter to gamma radiation
B Ciesielski1, L Wielopolski, L E Reinstein
1Brookhaven National Laboratory, Medical Department, Upton, New York 11973.
Medical Physics
|May 1, 1988
Abstract:
Calculations of the energy response of an electron paramagnetic resonance (EPR) signal induced by gamma radiation in an agar-alanine phantom dosimeter are presented. Theoretically calculated slopes of the EPR signal calibration lines are comparable with those obtained experimentally for low-(50 kVp), medium-(662 keV), and high-(15 MVp) energy photons. The sensitivity of the phantom dosimeter (EPR signal amplitude/Gray) varies less than 2% within the 150- to 20-MeV energy range. For energies above 150 keV, the influence of variations in the size of alanine crystals is negligible.