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Dosimetric aspects of small circular fields of 10 MV photon beam
W H Al-Najjar1, S Guru Prasad, K Parthasaradhi
1Division of Medical Physics, Northwestern University Medical School, Evanston Hospital, IL 60201, USA.
Abstract:
Dosimetric data obtained from different measurement techniques of 10 MV small circular photon beams of 12.5, 20, 30, and 40 mm diameter were studied. The effects of lack of lateral electronic equilibrium and steep dose gradient were noticed even when measurements were performed with a small volume (0.02 cc) ionization chamber. From an examination of the results, it is concluded that an average value of data obtained from several carefully performed film measurements may be used for routine radiosurgery.