| Datensatz noch nicht abgeschlossen | |
| Zugriffsnummer | 45396 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Thermal decay effects on spatial distributions of radicals in γ-irradiated poly(methyl methacrylate) |
| Autor(in); Institution |
Kaul, Walter; PTB-Braunschweig
Kevan, Larry; Wayne State University, Department of Chemistry, Detroit, USA
|
| Quelle/Jahr | Journal of Physical Chemistry: 75 (1971), 16, 2443 - 2448 |
| ISSN | 0022-3654 (PRINT) ; 0092-7325 (PRINT) ; 1943-3018 (ONLINE) |
| DOI | |
| Verlag | Easton, Pa.: ACS |
| Zusammenfassung | Spin-spin, T2, and spin-lattice, T1, relaxation time were measured for the radicals in τ-irradiation PMMA at room temperature vs. radiation dose and vs. thermal decay after irradiation. T2 is related to the local spin concentration around a radical. The local spin concentrations are larger than the average spin concentrations over the entire sample up to doses of about 5 Mrads. This indicates that the radicals are trapped in regions of high local spin concentration called spurs. At doses above 7 Mrads the local and average spin concentrations are comparable. During thermal decay at doses less than 5 Mrads the local and average spin concentration decreases fractionally faster then the average spin concentration which indicates intraspur decay. During thermal decay at doses greater then 7 Mrads the local and average spin concentrations decrease at similar fractional rates. |
