Management of induced radioactivity in a PET cyclotron

2014 Fiscal Year Final Research Report

• Project/Area Number: 25861096
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Radiation science
• Research Institution: Osaka University
• Principal Investigator: HORITSUGI Genki 大阪大学, 医学(系)研究科(研究院), 特任研究員(常勤) (70646231)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: サイクロトロン / 中性子 / 放射化

Outline of Final Research Achievements

The purpose of this study was to measure the thermal neutron flux in the cyclotron room during producing positron emitters（C-11, N-13, O-15 and F-18）and to evaluate the activation level of the concrete in the cyclotron room. The gold foil activation method was used for measurement of the thermal neutron flux.
As the result, the thermal neutron flux outside the self-shield during the production of F-18 was 4.67×10＾2 /cm＾2/s. Thermal neutron fluxes near target during C-11, N-13, O-15 and F-18 production were 3.76×10＾6, 2.41×10＾6, 2.29×10＾6 and 3.18×10＾6 /cm＾2/s, respectively. Under normal operating conditions, thermal neutron flux during producing of F-18 was the highest. Thermal neutron fluxes during C-11, N-13 and O-15 production were sufficiently low as compared with that during F-18 production.

Free Research Field

医歯薬学