DOE-HDBK-1017/2-93Plant MaterialsRADIATION EFFECTS IN ORGANIC COMPOUNDSFigure 7Effect of Gamma Radiation on Different Types of HydrocarbonThe stability of organic (and other covalent) compounds to radiation is frequently expressed bymeans of the "G" value, which is equal to the number of molecules decomposed, or of productformed, per 100 eV of energy dissipated in the material. As an example of the use of G values,the data in Table 3 are for a number of polyphenyls exposed to the radiation in a thermal reactor.The table shows the number of gas molecules produced, G(gas), and the number of polyphenylmolecules, G(polymer), used to produce higher polymers per 100 eV of energy deposited in thematerial. Note that this adds up to approximately 1000 atoms of gas and 10,000 atoms forminghigher polymers per each 1 MeV particle. It is also of interest to note that the terphenyls areeven more resistant to radiation than diphenyl and, since they have a higher boiling point, amixture of terphenyls with a relatively low melting temperature was chosen as the moderator-coolant in organic-moderated reactors.Rev. 0Page 47MS-05
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