Design of radiation shielding for the proton therapy facility at the National Cancer Center in Korea.
The design of radiation shielding was evaluated for a proton therapy facility being established at the National Cancer Center in Korea. The proton beam energy from a 230 MeV cyclotron is varied for therapy using a graphite target. This energy variation process produces high radiation and thus thick shielding walls surround the region. The evaluation was first carried out using analytical expressions at selected locations. Further detailed evaluations have been performed using the Monte Carlo method. Dose equivalent values were calculated to be compared with analytical results. The analytical method generally yielded more conservative values. With consideration of adequate occupancy factors annual dose equivalent rates are kept <1 mSv y(-1) in all areas. Construction of the building is expected to be completed near the end of 2004 and the installation of therapy equipment will begin a few months later.
Kim
Jong-Won
JW
Center for Proton Therapy, National Cancer Center, 809 Madu-dong, Koyang, Kyonggi 411-764, Korea. jwkim@ncc.re.kr
Kwon
Jeong-Wan
JW
Lee
Jaiki
J
D003198:Computer Simulation; D004867:Equipment Design / Q000379:methods; D019544:Equipment Failure Analysis / Q000379:methods; D005160:Facility Design and Construction / Q000295:instrumentation / Q000379:methods*; D007723:Korea; D015233:Models, Statistical; D009010:Monte Carlo Method; D016522:Oncology Service, Hospital; D010315:Particle Accelerators / Q000295:instrumentation; D061766:Proton Therapy; D011829:Radiation Dosage; D011834:Radiation Monitoring / Q000379:methods*; D011835:Radiation Protection / Q000295:instrumentation* / Q000379:methods*; D011878:Radiotherapy / Q000295:instrumentation*; D018570:Risk Assessment / Q000379:methods; D012307:Risk Factors; D011522:Protons
D011522:Protons