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KMID : 0362919900080010115
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Journal of the Korean Society for Therapeutic Radiology and Oncology
1990 Volume.8 No. 1 p.115 ~ p.124
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Characteristics of 23 MV Photon Beam from a Mevatron KD 8067 Dual Energy Linear Accelerator
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Kim Ok-Bae
Choi Tae-Jin
Kim Young-Hoon
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Abstract
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The characteristics of 23 MV photon beam have been presented with respect to clinical parameters of central axis depth dose, tissue-maximum ratis, scatter-maximum ratios, surface dose and scatter correction factors.
The nominal accelerating potential was found to be 18.5±0.5 MV on the central axis.
The half-value layer (HVL) of this photon beam was measured with narrow beam geometry from central axis, and it has been showed the thickness of 24.5 g/㎠.
The tissue-maximum, ratio values have been determined from measured percentage depth dose data.
In our experimental dosimetry, the surface dose of maximum showed only 9.6% of maximum dose at 10×10㎠, 100㎝ SSD, without blocking tray in. The TMR’S of 0×0 field size have been determined to get average 2.3% uncertainties from three different methodis; are zero effective attenuation coefficient, non-ilnear least square fil of TMR’s data and effective linear attenuation coefficient from the HVL of 23 MV photon beams of dual energy linear accelerator.
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KEYWORD
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23 MV photon beam, TMR, SMR, Surface dose
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