Journal of Medical Physics
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Year : 1999  |  Volume : 24  |  Issue : 1  |  Page : 25-27

Dosimetric Accuracy At Low Monitor Unit Setting In Electron Beams At Different Dose Rates



Correspondence Address:
M Ravikumar


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As electron beam with low monitor unit (LMU) settings are used in some dosimetric studies, better understanding of accuracy in dose delivery at LMU setting is necessary. The dose measurements were carried out with 0.6-cm3 Farmer type ion chamber atda max a polystyrene phantom. Measurements at different MUs show that the Dose Linearity Ratio (DLR) increases as the MU setting decreases below 20 MU and DLRs are found to increase when the incident electron beams have higher energies. The increase in DLR is minimum for low dose rate setting for all five electron beam energies (6, 9, 12, 16 and 20 MeV). As the variation in dose delivery is machine-specific, a detailed study should be conducted before the low MU setting is implemented. Since errors in dose delivery are high at higher dose rates, low dose rate may be better at low MU unit setting.


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