A Monte Carlo shielding model for PET/CT clinics
نویسندگان
چکیده
A Monte Carlo shielding model for PET/CT clinics Robert L. Metzger and Kenneth A. Van Riper Radiation Safety Engineering, Inc Chandler, AZ Abstract Modern PET/CT clinics consist of a scanner room housing the double gantry PET/CT unit and a control area, two or more quiet rooms where patients rest prior to scanning, and a hot lab where doses are prepared. Of these areas, the scanner room, quiet rooms, and frequently the hot lab require structural shielding to protect staff and personnel in surrounding areas. The 511 keV photons from the PET positron emitting isotopes are the source term for the quiet rooms and the hot lab, while both the 511 keV photons and the polyenergtic spectrum of x-rays from the CT unit must be considered for the scanner room. We have developed a three dimensional model of the PET quiet rooms and the PET/CT scanner room for the Monte Carlo code MCNP Ver 5 , and for the Mercurad shielding code. The quiet room model consists of a MIRD phantom in a reclining position with 555 MBq (15 mCi) of F distributed in 18
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