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Updated: Mar 29, 2026

Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
Published on: May 9, 2014
Calibration and efficiency curve of SANAEM ionization chamber for activity measurements
Emin Yeltepe1, Karsten Kossert2, Abdullah Dirican1
1Turkish Atomic Energy Authority, Saraykoy Nuclear Research and Training Center (TAEK-SANAEM), Saray M., Atom Cd. No.27, Kazan, Ankara, Turkey.
Abstract:
A commercially available Fidelis ionization chamber was calibrated and assessed in PTB with activity standard solutions. The long-term stability and linearity of the system was checked. Energy-dependent efficiency curves for photons and beta particles were determined, using an iterative method in Excel™, to enable calibration factors to be calculated for radionuclides which were not used in the calibration. Relative deviations between experimental and calculated radionuclide efficiencies are of the order of 1% for most photon emitters and below 5% for pure beta emitters. The system will enable TAEK-SANAEM to provide traceable activity measurements.
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