Journal of Medical Physics
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Year : 1995  |  Volume : 20  |  Issue : 1  |  Page : 13-19

Characteristic Parameters Of 6-20 MEV Electron Beams From Clinic-1800

Correspondence Address:
Anil Kumar Sharma

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Source of Support: None, Conflict of Interest: None

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Characteristics of the electron beams of energies 6,9,12,16 and 20 MeV produced by Clinac 1800 have been studied. The characteristics include percentage depth dose, isodose distribution, and depth of maximum dose, surface dose, photon contamination, uniformity index and penumbra. Most of the measurements are carried out using semiconductor detectors while small volume ionization chambers and plane-parallel chamber served as standards for comparison. Isodose curves were drawn using the film densitometry method. Range-energy are obtained from the observed depth dose data. These parameters vary from machine to machine and require to be ascertained for individual units. Though the observed parameters differ to a considerable extent from their theoretically predicted values, yet they generally follow the trend experimentally observed by others for similar type of units.

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