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Additional resources for Dosimetry of X-Ray and Gamma-Ray Beams for Radiation Therapy in the Energy Range 10 keV to 50 MeV
With a wall too thin, the measurement will result from the relative mixture of electrons and photons in the beam rather than &omthe photons. For x rays up to 500 kV, the maximum electron buildup is established by 1 mm or leas of the chamber waU For '37Cs,@ C O ,' and 2-MVx-ray units, maximum electron buildup requires a greater chamber wall thickness either by chamber design or by the addition of a plastic cap. Table 2 indicates the wall thicknesses required for some photon energies For in-air measurements, if a buildup cap is used for field work, then the same cap shaU be in place when the chamber is calibrated.
On some units the distance indicated by the optical indicator is easily changed by bumping or jarring. 1). 7 Stability of Treabnent Couch During Treatment Observation of alignment and distance setting of the light field on the patient before and after treatment checks the stability of the treatment couch as well as patient motion during treatment. Agreement to about 2 mm should be expected. 1 Beam and Machine Characteristics Relating to the Calibration of Radiation Therapy Machines Introduction The qualified expert who is commiesioning a new machine shall not perform the calibration until the safety, mechanical, and optical features have been tested (Section 62).
The field aize dependence at the depth of maximum is shown in Figure 13 for a %o unit. Since the effect of field size may differ from machine to machine, even for the same model, the field size dependence shall be determined for each machine at each treatment distance and with each penumbra trimmer position. 90 0 10 20 30 Length of Side of Square Field (cm) F'Q. Is. Typical fieldsite d q a c b c e of tbe relative absorbed dose born a BCo unit at the depth of mnirrmmin a water phantom Me;rwPementem r e made in air and thaee reaulb multiplied by the appropi& backscatter faNomdiration to unity m for a 10-mx l k field with the hinmer's retracted, 64 / 6.