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Journal Articles

Experimental study for the production cross sections of positron emitters induced from $$^{12}$$C and $$^{16}$$O nuclei by low-energy proton beams

Akagi, Takashi*; Yagi, Masashi*; Yamashita, Tomohiro*; Murakami, Masao*; Yamakawa, Yoshiyuki*; Kitamura, Keiji*; Ogura, Koichi; Kondo, Kiminori; Kawanishi, Shunichi*

Radiation Measurements, 59, p.262 - 269, 2013/12

https://doi.org/10.1016/j.radmeas.2013.07.005
 Times Cited Count：16 Percentile：76.68(Nuclear Science & Technology)

In proton therapy, positron emitters are induced from $$^{12}$$C and$$^{16}$$O nuclei by protons on the beam path in the patient. Many studies for monitoring positron emitters with beam-induced PET technique have been performed by various groups to verify the proton beam range and the dose in the patient for quality assurance. The aim of this study was to develop a method for measuring the production cross sections of positron emitters using standard equipment for proton therapy. The time-activity curve was then obtained with a high-sensitivity PET scanner to extract the number of positron emitters produced in the target. The production cross sections for four reaction channels: $$^{16}$$O(p,pn)$$^{15}$$O, $$^{16}$$O(p,3p3n)$$^{11}$$C, $$^{16}$$O(p,2p2n)$$^{13}$$N, and $$^{12}$$C(p,pn)$$^{11}$$C were then measured. The cross sections for the $$^{16}$$O(p,pn)$$^{15}$$O reaction channel were consistent with data of previous experiments within the uncertainties, while those of $$^{12}$$C(p,pn)$$^{11}$$C were generally lower than data of previous experiments.

Oral presentation

Inspection and repair techniques in reactor vessel of sodium cooled fast reactor, 5-1; Current status of in-vessel observation and repair techniques in Joyo

Sekine, Takashi; Kitamura, Ryoichi; Maeda, Yukimoto; Chatani, Keiji

no journal, , 

Since in-vessel observation for a sodium fast reactor has to be conducted under severe conditions that include high temperatures (approximately 200$$^{circ}$$C) and high radiation doses (approximately 200 Gy/h). In addition, since the primary sodium coolant has to be always kept in the reactor vessel to remove the decay heat of fuel subassemblies. Therefore an in-vessel observation equipment has to be designed to not only stand the severe conditions but also be capable of being inserted into the sealed reactor vessel through the holes built into the rotating-plug. In Joyo, in-vessel inspections and repair technologies are developed and applied to observe the upper core structure and bent irradiation test subassembly. The detail design of the Joyo restoration work is now pushed forward based on the in-vessel observation results.

Oral presentation

Inspection and repair techniques in reactor vessel of sodium cooled fast reactor, 6-1; Current status of in-vessel observation and repair techniques in Joyo

Kitamura, Ryoichi; Sekine, Takashi; Maeda, Yukimoto; Chatani, Keiji

no journal, , 

no abstracts in English

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