17. Which of the following is not true about electron beams nTan ieams, the perc

Question

17. Which of the following is not true about electron beams nTan ieams, the perceniage surfice dse in ciectro beams decreases with increasing energy B) In contrast to photon beams, Zmax in electron beams does not follow a specific trend with electron beam energy C) Similarly to PDDs for photon beams, the PDDs for electron beams, at a given source-surface distance SSD, depend upon field size D) The PDDs of electron beams are measured with Diode detector in water phantom E) For relatively large field sizes the PDD distribution at a given electron beam energy is essentially independent of field size

Explanation / Answer

A. False, percent surface dose increase with increasing energy

B. True

C. True

D. True

E. True

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