TA 100 Materials ComcCone (μg/plate) -S9Mix + S9Mix Methanol extract 0 151 114 from nonirradiated 500 150 115 potting material 1000 173 115   2500 182 145   5000 171 154 Methanol extract 0 109 100 from 105 kGy 500 175 105 irradiated 1000 214 136 potting material 2500 511 157   5000 1014 191 Acetone extract 0 151 114 from nonirradiated 500 120 103 potting material 1000 105 106   2500 134 119   5000 134 106 Acetone extract 0 127 116 from 105kGy 500 128 107 irradiated 1000 147 107 potting material 2500 155 145   5000 249 126

Table 2: Ames test of base substitution mutation detection using methanol and acetone extracts from irradiated and nonirradiated thermosetting PU potting material.