Radiation-Induced Free Radicals in Frozen Aqueous Solutions of Glycine
Radiation-induced free radicals in frozen aqueous solutions of glycine have been studied by electron spin resonance spectroscopy. At 77 deg K the resonance spectra exhibit the composite patterns of ESR centers induced in water as well as in the glycine molecules. The water resonance at 77 deg K is ascribed to OH radicals and some unidentified ESR species. The radiation yield for all ESR centers in H2O at 77 deg K is found to be G - 1.0. About 50% is presumed to be OH radicals. The water resonance is relatively unstable and disappears rapidly in the temperature range 100 to 120 deg K, whereas the glycine radicals are much more stable and may be observed at temperatures nearly up to the melting point of the solution. The glycine radicals are proposed to be +NH3CHCOO- and -CH 2COO-. The results s how that the number of glycine radicals increases almost linearly with the concentration. These data seem to indicate that the major fraction of the glycine radicals induced at 77 deg K is the result of the direct action of radiation. Based on this assumption, the yield for glycine radicals is found to be G = 4.4.
- Research Organization:
- Norsk Hydro's Inst. for Cancer Research, Montebello, Oslo
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-16-027093
- OSTI ID:
- 4806649
- Journal Information:
- Radiation Research, Journal Name: Radiation Research Journal Issue: 2 Vol. 17; ISSN 0033-7587
- Publisher:
- Radiation Research Society
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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