sub 40 11 26 8 63 u03b4yi sub 40 2 96 5 48______________________________________ 34 x 34 denotes the number of bromine substituents on the endcapping moiety the subscripts indicate the number of days that the specimens were stored in the dark after exposure to gamma radiation 34 u03b4 34 denotes the difference between the yellowness index after th exposure and that of the initial value of the unradiated sample in a second set of experiments the propylene glycol used in preparing the stabilizer had a molecular weight of about 2000 the method of end capping and the procedures for preparing the samples and their evaluation were as described above the table below summarizes the results table 2______________________________________yellowness index yi of stabilized compositionsand of the unstabilized resin control x 5 x 3 control______________________________________initial yi 4 98 3 02 3 85yi sub 0 9 27 8 52 20 43 u03b4yi sub 0 4 29 5 50 16 58yi sub 7 8 98 8 56 16 39 u03b4yi sub 7 4 00 5 54 12 54yi sub 12 9 02 8 58 16 14 u03b4yi sub 12 4 04 5 56 12 29yi sub 20 9 10 8 65 16 09 u03b4yi sub 20 4 12 5 63 12 24yi sub 40 9 09 8 60 16 02 u03b4yi sub 40 4 11 5 58 12 17______________________________________ 34 x 34 denotes the number of bromine substituents on the endcapping moiety the subscripts indicate the number of days that the specimens were stored in the dark after exposure to gamma radiation.