| 摘要 |
By obtaining µSR signals of positive muons produced by particle radiation themselves stopped at a Bragg peak position of the charged particle radiation pulses such as proton beams, radiological effects in particle radiation therapy such as proton beams therapy are precisely known. When 230 MeV protons emitted from an accelerator are taken in, proton beam pulses are emitted from a irradiation apparatus 11, and at each time when a patient (human body 2) to accept therapy is irradiated, only the delay positrons produced due to decay of forward muons produced by the same protons at the Bragg peak position in the living body are selected in position and in time by using lead shielding plates 4 and delay signals, where information of positron produced positions and the times of delay simultaneous signals is measured by each positron counter of the first position sensitive positron counter board 9 and each positron counter of the second position sensitive positron counter board 10. Thus, delay positrons are measured, and then the measured results are analyzed to display µSR signals segmented for each positron produced position in the vicinity of the Bragg peak position of the protons on a display apparatus 8.
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