High energy electron beams are one of those ionizing radiation beams that are being widely used in nuclear medicine for treatment of cancerous tumors. However, these beams may also harm the healthy cells in traversing the patient body. Accordingly, knowing the dose distribution in a tissue-equivalent phantom is the main requirement in an electron therapy treatment design. In recent years, great interest is attracted toward the application of digital holography method for accurate three dimensional measurement and monitoring of the absorbed dose. In this work, design and modelling of a mobile dosimetric instrument, which works based on the digital holography principles, are studied and a new approach is developed for measuring the absorbed dose of electron radiation using the digital holography technique with a laser beam. The proposed method for measuring the absorbed dose is also developed to be immune against the environmental noises that are present in difficult situations. Monte Carlo and numerical modelling of the instrument, demonstrate its capability in accurate measurement of the absorbed dose.

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