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Gd-152 ( 0.20% , 1.08E14 ) Gd-154 ( 2.18% ) Gd-155 ( 14.80% ) Gd-156 ( 20.47% ) Gd-157 ( 15.65% ) Gd-158 ( 24.84% ) Gd-160 ( 21.86% ) Isotopes: Gd-136 Gd-137 Gd-138 Gd-139 Gd-140 Gd-141 Gd-142 Gd-143 Gd-144 Gd-145 Gd-146 Gd-147 Gd-148 Gd-149 Gd-150 Gd-151 Gd-153 Gd-159 Gd-161 Gd-162 Gd-163 Gd-164 Gd-165 Gd-166 Gd-167 Gd-168 Gd-169 For information on elements, we recommend  . |