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Need to determine absorbed dose in the different tissues in human body
•
Water is a good soft tissue equivalent material for high energy photon and
electron beams.
Why water or water-equivalent phantoms
Dosimetry for beam characterisation & TPS verification:
• Reference dosimetry: most dosimetry Codes of Practice (CoP) use water as
reference medium
• Relative dosimetry: relative depth functions (PDD, TPR), beam profiles,
output factors etc. are measured in water