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J Korean Soc Ther Radiol > Volume 6(1); 1988 > Article
Journal of the Korean Society for Therapeutic Radiology 1988;6(1): 85-92.
Dosimetric Characteristics of the KCCH Neutron Therapy Facility
Seong Yul Yoo, Sung Woo Noh, Hyun Woo Chung, Chul Koo Cho, Kyoung Hwan Koh, Joo Shik Bak, Juri Eenmaa
1Laboratory of Cyclotron Korea Cancer Center Hospital, Korea.
2Department of Radiation Oncology, University of Washington, Seattle, Wa, U.S.A.
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.
Key Words: Neutron Beam, Dosimetry, cyclotron, Tissue equivalent chamber, Depth dose, Build-up, profile
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