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Yeungnam Univ J Med > Volume 8(2); 1991 > Article
Yeungnam University Journal of Medicine 1991;8(2):114-120.
DOI: https://doi.org/10.12701/yujm.1991.8.2.114    Published online December 31, 1991.
A study on dose distribution of small irradiation field in the electron therapy.
Sung Kyu Kim, Sei One Shin, Myung Se Kim
Abstract
In electron therapy, low melting point alloy is used for shaping of the field. Electron field shaping material affect the output factor as well as the collimator system. The output factors of electron beams for shaped fields from NELAC-1018 were measured using ionization chamber of Farmer type in water phantom. The output factors of electron beams depend on the incident energy, inherent collimator system and the size of shaped field. Obtained results were followings. 1. In the smaller applicator, output varied extremely according to extent of collimator opening. 2. The higher energy, the output is less varied according to treatment field at small field.
Key Words: Output factors, Electron beam, Field size


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