Neutron Flux Inside and Outside a PET Cyclotron Room

概要

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Radionuclides for PET are mainly produced using on-site small cyclotrons. During the production of the radionuclides significant quantities of neutrons are produced. Gold foil activation was used as a method to detect the neutrons at several points around a cyclotron. Thermal neutron fluxes in the target box were estimated as 9.3×106cm-2 s-1 and 1.7×106cm-2s-1 during 18F and 11C production, respectively. Those in the cyclotron room were estimated as 4.1×105cm-2s-1and 1.2×105cm-2s-1, respectively. Those outside the room were estimated as being equal to or less than -3cm-2s-1, which corresponded to 0.1μSv h-1 in effective dose. The effective dose outside the cyclotron room was proved to be safety level.
日本放射線安全管理学会の論文