衰变产物 在原子核物理學中衰變產物也稱子核種子同位素是指一個放射性核種經過輻射衰變後形成的新核種輻射衰變通常涉及一連串的衰變過程稱衰變鏈例如鈾U衰變成釷Th釷Th再衰變成鏷Pa而鏷Pa再衰變成最終衰變成穩定的鉛Pb U  Th  daughter of U  Pam  granddaughter of U    Pb  decay products of U displaystyle mboxUrightarrow overbrace underbrace mboxTh mboxdaughter of Urightarrow underbrace mboxPam mboxgranddaughter of Urightarrow ldots rightarrow mboxPb beginarraycmboxdecay products of Uendarray v displaystyle v 在這例子中 釷鏷m鉛是鈾的衰變產物 釷是鈾的子同位素 鏷m  metastable是鈾的至孫同位素 These might also be referred to as the daughter products of U