Publication Date:
2015-08-14
Description:
The type of the Electron String Ion Sources (ESIS) is considered to be the appropriate one to produce pulsed C 4+ and C 6+ ion beams for cancer therapy accelerators. In fact, the new test ESIS Krion-6T already now provides more than 10 10 C 4+ ions per pulse and about 5 × 10 9 C 6+ ions per pulse. Such ion sources could be suitable to apply at synchrotrons. It has also been found that Krion-6T can provide more than 10 11 C 6+ ions per second at the 100 Hz repetition rate, and the repetition rate can be increased at the same or larger ion output per second. This makes ESIS applicable at cyclotrons as well. ESIS can be also a suitable type of ion source to produce the 11 C radioactive ion beams. A specialized cryogenic cell was experimentally tested at the Krion-2M ESIS for pulse injection of gaseous species into the electron string. It has been shown in experiments with stable methane that the total conversion efficiency of methane molecules to C 4+ ions reached 5%÷10%. For cancer therapy with simultaneous irradiation and precise dose control (positron emission tomography) by means of 11 C, transporting to the tumor with the primary accelerated 11 C 4+ beam, this efficiency is preliminarily considered to be large enough to produce the 11 C 4+ beam from radioactive methane and to inject this beam into synchrotrons.
Print ISSN:
0034-6748
Electronic ISSN:
1089-7623
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
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