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1、表1 钍系衰变链核素名称半衰期（T1/2）射线主要能量（Kev）分支比（%）232Th1.41x1010a63.811140.880.2590.021228Ra5.75a12.8813.5226.400.301.600.14228Ac6.15h129.065209.248270.245328.004338.320409.460463.002794.942835.704911.196964.786968.9601630.6182.53.973.553.0411.42.024.454.311.7026.34.9915.91.52228Th1.91a84.373131.612166.410215.9
2、851.190.1270.10040.246224Ra3.63d240.9864.12220Rn55.8s549.760.115216Po0.148s804.90.0019212Pb10.64h115.183238.632300.0890.62443.63.18212Bi60.54min39.858727.330785.371620.7381.076.651.111.51208Tl3.058min277.37510.74583.187763.45860.532614.5113.1724.122.149.612.499.755212Po300x10-9s无无208Pb稳定表2 铀系衰变链核素名称
3、半衰期（T1/2）射线主要能量（Kev）分支比（%）238U4.468x109a49.55113.50.06970.0174234Th24.10d63.392.3892.8112.83.752.182.150.215234Pa131.3152.7227.25569.5733.39880.52883.24925926.7946.018.26.05.89.37.010.59.77.97.313.5234U2.455x105 a53.2120.90.12530.0386230Th7.538x104 a67.67143.87253.730.3770.04880.0111226Ra1600a186.21
4、3.55222Rn3.82d5100.076218Po3.098min8370.0011214Pb26.8min53.23241.997295.224351.932785.961.067.2718.41435.601.064214Bi19.9min609.312768.356934.0611120.2871238.111377.6691764.4942204.2145.494.8923.1014.915.8313.96815.314.913214Po163.6us799.70.0104210Tl1.3min97296356799.6860107011101210131014102010209023602430479498.9696.911.96.916.820.84.96.94.97.98.9210Pb22.2a46.54.252210Bi5.012d265.832304.8920.0000480.000061210Po138.4d803.0520.00123206Pb
