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KMID : 0362919880060010085
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Journal of the Korean Society for Therapeutic Radiology and Oncology
1988 Volume.6 No. 1 p.85 ~ p.91
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Dosimetric Characteristics of the KCCH Neutron Therapy Facility
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Yoo Seong-Yul
Noh Sung-Woo
Chung Hyun-Woo
Cho Chul-Koo
Koh Kyoung-Hwan
Bak Joo-Shik
Eenmaa Juri
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Abstract
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For the physical characterization of neutron beam, dosimetric measurements had been performed to obtain physical data of KCCH cyclotron-produced neutrons for clinical use. The results are presented and compared with the data of other institutions from the literatures. The central aixs percent depth dose, build-up curves and open and wedge isodose curve values are intermediate between that of a 4 and 6 MV X-ray. The build-up level of maximum dose was at 1.35 cm and entrance dose was approximately 40%. Flatness of the beam was 9% at Dmax and less than±3% at the depth of 80% isodose line. Penumbra begond the 20% line is wider than corresponding photon beam. The output factors ranged 0.894 for 6 x 6 cm field to 1.187 for 30 x 30 cm field.
Gamma contamination of neutron beam was 4.9% at 2 cm depth in 10 x10 cm field.
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KEYWORD
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Neutron Beam, Dosimetry, cyclotron, Tissue equivalent chamber, Depth dose, Build-up, profile, Isodose curve, Output
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