Radiation degradation, analysis

Using ion beam technologies denoted in Section 27.3, research and development of advanced materials and devices have been made for their space, nuclear, and industrial applications. As typical examples of such researches, evaluation and development of semiconductor devices for space application, characterization of radiation degradation of nuclear materials, beam analysis and modification of inorganic materials, and beam processing of organic materials are described in this section. 

Kuruc, J. Sahoo, M. K. Locaj, J. Hutta, M. Radiation degradation of waste waters. I. Reverse phase-high performance liquid chromatography and multicomponent UV-VIS analysis of gamma-irradiated aqueous solutions of nitrobenzene, J. Radioanal. Nucl. Chem. 1994, 183, 99. 

Fig. 12 Local degradation analysis using transmission Fourier transform IR (FTIR) spectroscopy in an FEP (25 pm) radiation-grafted membrane, artificially aged for 690 h using Hj and as reactants at various operating conditions 0-1 A cm, 78-95°C, 1-3 bar. Local degradation analysis in channel/land areas of the flow field is accomplished via a slit mask for the quantification of the p-styrene sulfonic acid ring vibrational band, with the pristine membrane as a reference...

Lappan, U., Fuchs, B., Geissler, U., Scheler, U., Lunkwitz, K. (2002) Number-average molecular weight of radiation-degraded poly(tetrafluoroethylene). An end group analysis based on sohd-state NMR and IR spectroscopy. Polymer, 43, 4325-4330. 

Brack, H.-P, Ruegg, D., Biihrer, H., Slaski, M., Alkan, S. and Scherer, G. G. 2004. Differential scanning calorimetry and thermogravimetric analysis investigation of the thermal properties and degradation of some radiation-grafted films and membranes. Journal of Polymer Science Part B Polymer Physics 42 2612-2624. 

The epoxy resin formed by tetraglycidyl 4,4 -diamino diphenyl methane and 4,4 -diamino diphenyl sulfone was characterized by dynamic mechanical analysis. Epoxy specimens were exposed to varying dose levels of ionizing radiation (0.5 MeV electrons) up to 10,000 Hrads to assess their endurance in long-term space applications. Ionizing radiation has a limited effect on the mechanical properties of the epoxy. The most notable difference was a decrease of approximately 40°C in Tg after an absorbed dose of 10,000 Mrads. Sorption/desorption studies revealed that plasticization by degradation products was responsible for a portion of the decrease in Tg. 

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