Therapeutic Radiographer Practice Questions - Radiographers Board Of Hong Kong Registration Assessment - Therapeutic Radiography Exam

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In electron beam therapy, what is the approximate relationship between the energy (E in MeV) of the electron beam and its practical range (Rp in cm) in water?

Rp ≈ E / 4 Rp ≈ E / 2 Rp ≈ E * 2 Rp ≈ E / 3

Correct Answer:

Rp ≈ E / 2

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