| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
|
|---|
| 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.
|
