Title :
Performance of parallel plate ionization chamber for medical irradiation
Author :
Urakabe, E. ; Inoue, M. ; Iwashita, Y. ; Shirai, T. ; Sugimura, T. ; Noda, A. ; Kanazawa, M. ; Torikoshi, M. ; Noda, K. ; Yamada, S. ; Tadokoro, M. ; Nishi, M. ; Fujita, Y.
Author_Institution :
Inst. for Chem. Res., Kyoto Univ., Japan
Abstract :
We have developed parallel plate ionization chambers (PPIC) to measure not only the cumulative intensity but also the time structure of slow-extracted heavy-ion beams from a medical synchrotron. The characteristics of the PPIC with 3 mm and 1 mm gap distances for 760, 200, 111, and 55 Torr air were investigated with C6+ beam (290 MeV/u) at HIMAC. The applied voltage to start the plateau region strongly depends on the beam intensity, and pressure of counter gas. The PPIC can be also used as a useful beam monitor for the time-structure measurement of heavy-ion beams
Keywords :
ion accelerators; ion beams; ionisation chambers; particle beam diagnostics; particle beam extraction; radiation therapy; synchrotrons; 111 torr; 200 torr; 290 MeV; 55 torr; 760 torr; C; C6+ beam; HIMAC; beam monitor; cumulative intensity measurement; medical irradiation; medical synchrotron; parallel plate ionization chamber performance; plateau region; slow-extracted heavy-ion beams; time structure; Aluminum; Biomedical monitoring; Electrodes; Ion beams; Ionization chambers; Radiation detectors; Radiation monitoring; Synchrotrons; Time measurement; Voltage;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.753426
