초록 close

We devised a proton beam irradiation method to obtain a uniform dose distribution over a sample volume with a range-modulating propeller and a rotatable sample stage. The range-modulating propeller and the rotatable sample stage were developed to achieve uniform longitudinal and transverse dose distributions in the sample, respectively. The functions of both devices were combined together under an appropriate working condition. The measured dose distributions had a uniformity above 90 % over a 16-cm-diameter, 10-mm-thick water-equivalent sample.


We devised a proton beam irradiation method to obtain a uniform dose distribution over a sample volume with a range-modulating propeller and a rotatable sample stage. The range-modulating propeller and the rotatable sample stage were developed to achieve uniform longitudinal and transverse dose distributions in the sample, respectively. The functions of both devices were combined together under an appropriate working condition. The measured dose distributions had a uniformity above 90 % over a 16-cm-diameter, 10-mm-thick water-equivalent sample.