Optimisation(ALARA):
All living things are exposed to ionising radiation from the natural (called background radiation) and man-made radiation sources. Ionising radiation may cause biological changes in the exposed person hence the doses to the occupational workers shall be kept As Low As Reasonably Achievable (ALARA) and doses to patients shall be optimized. Suitable control measures shall be employed to minimise radiation exposure so that maximum benefits are derived with minimum radiological risk.
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