| Abstract | The National Research Council of Canada has, in recent years, been developing a capability for using alanine dosimeters to measure absorbed dose to water at therapy dose levels in Co-60 and MV photon beams (Mansour, 2018). The stated uncertainty in the calibration of a batch of alanine dosimeters irradiated, in a therapy-level Co-60 irradiator, is 0.5 % and the uncertainty in the determination of dose using such dosimeters in a clinical radiation beam is estimated to be 0.6 % for doses in the range 10 Gy to 100 Gy. Other researchers (e.g. Billas et al, 2018) have demonstrated the suitability of alanine as a dosimeter for use in magnetic fields, and therefore the NRC capability was applied to the Elekta Unity MR-linac (MRL) installed at the Odette Cancer Centre. The purpose of this investigation was to provide external validation of the dose measured by medical physicists at the centre using standard dosimetry protocols and ionization chambers. |
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