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Dosimetry of proton-induced target fragments with CR-39 PNTD and AFM
https://repo.qst.go.jp/records/65663
https://repo.qst.go.jp/records/65663c04511e0-ab89-4884-abef-3b83ddd1d00a
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2015-06-01 | |||||
| タイトル | ||||||
| タイトル | Dosimetry of proton-induced target fragments with CR-39 PNTD and AFM | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
S.kodaira
× S.kodaira× T.Konishi× Y.Uchihori× H.Kitamura× M.Kurano× Kawashima, Hajime× L.Sihver× Benton, Eric× 小平 聡× 小西 輝昭× 内堀 幸夫× 北村 尚× 蔵野 美恵子× 川嶋 元× Ｓｉｈｖｅｒ Ｌｅｍｂｉｔ× Ｂｅｎｔｏｎ Ｅｒｉｃ |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | High energy protons, the main component of the cosmic rays, dominates the radiation risk for astronauts in space. Although the linear energy transfer (LET) of energetic protons is lower than that of heavy ions, their flux is extremely high in the cosmic rays. Results of space radiation dosimetry experiments using CR-39 plastic nuclear track detectors (PNTD) show that the contribution of proton-induced secondary particles to total absorbed dose and dose equivalent received by astronauts during space missions is significant. In addition to energy loss by ionization processes energetic protons can undergo nuclear interactions with target nuclei of Z >1, resulting in the production of short range (<10 µm), high-LET target fragment particles. One of the few methods to detect these short-range particles is by means of CR-39 PNTD analyzed with an atomic force microscope (AFM). For the evaluation of the short-range, high LET target fragment contribution to total dose, CR-39 (BARYOTRAK) PNTDs were irradiated with 30 - 230 MeV protons at HIMAC and cyclotron facilities in NIRS. CR-39 PNTDs are insensitive to primary protons of these energies due to the LET detection threshold of CR-39. Sets of CR-39 PNTD were exposed at six different incident angles to take into account the intrinsic sensitivity of the critical angle for track registration of the detector. Following irradiation and chemical processing, LET spectrum between 15 and 1500 keV/m was measured in each detector set by means of AFM. In this presentation the dose contribution of secondary particles for primary protons and its energy dependency will be presented. | |||||
| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | Space Radiation and Heavy Ions in Therapy Symposium 2015 (SRHITS2015) | |||||
| 発表年月日 | ||||||
| 日付 | 2015-05-23 | |||||
| 日付タイプ | Issued | |||||
