Abstract
The response of both plane-parallel and cylindrical chambers was studied and compared with ferrous sulphate dosimetry over a wide range of photon energies. Perturbation correction factors were determined for these chambers in photon beams. Also the influence of the aluminium central electrode of the NE2571 chamber was determined in the electron field relative to 60Co gamma -radiation. Electron backscatter from the back wall of the chamber was shown to influence the signal in the chamber significantly. A procedure for calibration of 60Co gamma -rays in water in plane-parallel chambers is discussed.
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