Abstract
The dose due to Bremsstrahlung in stationary electron beams of nominal energies in the range 6-20 MeV is typically between 1-7% of the maximum dose and is usually not clinically significant. However, in treatments using rotational or multiple electron beams where the X-ray dose from several beams is added the X-ray dose will reach much higher proportions and will be of clinical significance. Moreover, this does often is located in normal tissue beyond the target volume. Reduction of this X-ray dose is therefore desirable. In the present study a reduction of the X-ray component of electron beams produced by a Clinac 2100C accelerator by a change of the transmission ion chamber and scattering foils is reported. A reduction in Bremsstrahlung of up to 50% can be achieved.
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