@article{oai:repo.qst.go.jp:00078903,
 author = {Mizushima, Kota and Iwata, Yoshiyuki and Muramatsu, Masayuki and Sung-Hyun, Lee and Shirai, Toshiyuki and Kota, Mizushima and Yoshiyuki, Iwata and Masayuki, Muramatsu and Sung-Hyun, Lee and Toshiyuki, Shirai},
 issue = {2},
 journal = {Review of Scientific Instruments},
 month = {Feb},
 note = {The National Institute of Radiological Sciences has investigated multiple-ion therapy using energetic beams of helium, carbon, oxygen, and neon ions, to improve treatment outcomes of refractory cancer. For this therapy, it is necessary to ensure the helium-ion beam purity to avoid irradiation by unwanted ions. Here, we develop a measurement method for monitoring beam purity. This method can measure the charge number of the ions in a high-purity beam using an ionization chamber and Faraday cup. In addition, it can be used to detect the contamination of the clinical helium-ion beam. We perform beam experiments to evaluate our beam-purity monitoring method and predict that our method is capable of detecting contamination below 1%.},
 pages = {023309-1--023309-5},
 title = {Experimental study on monitoring system of clinical beam purity in multiple-ion beam operation for heavy-ion radiotherapy},
 volume = {91},
 year = {2020}
}