| Autor: |
Serge Pin, G. Baldacchino, G. Vigneron, Jean Philippe Renault, S. Le Caër, Emmanuel Balanzat, S. Bouffard, J.-C. Mialocq |
| Rok vydání: |
2006 |
| Předmět: |
|
| Zdroj: |
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 245:288-291 |
| ISSN: |
0168-583X |
| Popis: |
This article reports the determination of the OH radiolytic yields in water irradiated by high energy C 6+ and Ar 18+ ions with LET values of 32 ± 2 and 280 ± 10 eV nm −1 . The time evolution of the yields between 9 × 10 −11 and 9 × 10 −8 s was deduced using the scavenging method with SCN − and Br − and pulse radiolysis with pulses of 5 and 10 μs. The thiocyanate chemical system is less affected with the local high dose rates specific to the high LET particles than the bromide system. At 32 eV nm −1 with C 6+ ions, G (OH ) reaches a maximum of 1.5 × 10 −7 mol J −1 at 1 ns and decreases at earlier times. With Ar 18+ ions of 280 eV nm −1 G (OH ) is always increasing at early times up to 1.6 × 10 −7 mol J −1 at 9 × 10 −11 s. In this case the evolution of the hydroxyl radical yields agrees with the high local concentrations obtained with Ar 18+ and C 6+ ions and depicted in recent literature with the yields of the hydrated electron in the ns range. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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