WEKO3
アイテム
Ion recombination correction in carbon ion beams
https://repo.qst.go.jp/records/48099
https://repo.qst.go.jp/records/48099753285fd-7401-4bab-b26e-8f77b4512ff1
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2017-07-19 | |||||
| タイトル | ||||||
| タイトル | Ion recombination correction in carbon ion beams | |||||
| 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_6501 | |||||
| 資源タイプ | journal article | |||||
| 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 |
Ｒｏｓｓｏｍｍｅ, Ｓｅｖｅｒｉｎｅ
× Ｒｏｓｓｏｍｍｅ, Ｓｅｖｅｒｉｎｅ× ホフガートナー, ヨハン× N.D., Lee× A., Delor× R.A.S., Thomas× F., Romano× 福村, 明史× S., Vynckier× H., Palmans× Ｒｏｓｓｏｍｍｅ Ｓｅｖｅｒｉｎｅ× ホフガートナー ヨハン× 福村 明史 |
|||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Purpose: In this work, ion recombination is studied as a function of energy and depth in carbon ion beams. Methods: Measurements were performed in three different passively scattered carbon ion beams with energies of 62 MeV/n, 135 MeV/n, and 290 MeV/n using various types of plane-parallel ionization chambers. Experimental results were compared with two analytical models for initial recombination. One model is generally used for photon beams and the other model, developed by Jaffé, takes into account the ionization density along the ion track. An investigation was carried out to ascertain the effect on the ion recombination correction with varying ionization chamber orientation with respect to the direction of the ion tracks. The variation of the ion recombination correction factors as a function of depth was studied for a Markus ionization chamber in the 62 MeV/n nonmodulated carbon ion beam. This variation can be related to the depth distribution of linear energy transfer. Results: Results show that the theory for photon beams is not applicable to carbon ion beams. On the other hand, by optimizing the value of the ionization density and the initial mean-square radius, good agreement is found between Jaffé's theory and the experimental results. As predicted by Jaffé's theory, the results confirm that ion recombination corrections strongly decrease with an increasing angle between the ion tracks and the electric field lines. For the Markus ionization chamber, the variation of the ion recombination correction factor with depth was modeled adequately by a sigmoid function, which is approximately constant in the plateau and strongly increasing in the Bragg peak region to values of up to 1.06. Except in the distal edge region, all experimental results are accurately described by Jaffé's theory. Conclusions: Experimental results confirm that ion recombination in the investigated carbon ion beams is dominated by initial recombination. Ion recombination corrections are found to be significant and cannot be neglected for reference dosimetry and for the determination of depth dose curves in carbon ion beams. |
|||||
| 書誌情報 |
Medical physics 巻 43, 号 7, p. 4198-4208, 発行日 2016-07 |
|||||
| 出版者 | ||||||
| 出版者 | John Wiley and Sons, Inc. | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.118/1.4953637 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | http://onlinelibrary.wiley.com/doi/10.1118/1.4953637/abstract | |||||
| 関連名称 | http://onlinelibrary.wiley.com/doi/10.1118/1.4953637/abstract | |||||
