A parallel plate chambers are used for the absolute determination of absorbed dose in water at the reference depth and for relative dosimetry of clinical electron beam ranging from 6MeV to 20 MeV. The parallel plate chambers are also used for the photon beam dosimetry in the build-up region and surface dosimetry.

The accuracy of the ionization chambers’ calibration coefficient is one of the factors that would contribute to efficient radiotherapy treatment. The IAEA therefore has recommended that an ionization chamber be calibrated every 3 years, with a condition that the deviations between the previous and new calibration coefficients ND,w should not differ by ±1.5%.

Our objective is to calibrate radiation measuring instruments, provide traceability from Primary Standard Dosimetry Laboratories (PSDLs) and advise on all aspects of ionizing radiation metrology.
Our calibration procedures of ionization chambers used in radiotherapy are based on well-known and widely accepted dosimetry protocols.