三大衰变系α、β射线情况

1、表 1钍系衰变链核素名称半衰期（ T1/2 ）衰变类型主要能量分支比（ %）（Kev）38100.068232Th1.41x10 10a3948.5214001.278.912.730228Ra5.75a25.68.739.14939.5120.7228Ac6.15h.20665269.30.218228Th1.91a5304.10.4085435.726.05520.173.4224Ra3.63d5547.95.255788.994.73220Rn55.8s5854.90.1186404.799.882216Po0.148s6101.40.00196906.399.9981154.64.99

2、212Pb10.64h331.381.7569.913.35879.20.61（ 36%）6167.425.1212Bi60.54min6207.39.731.41.9（ 64%）739.41.441524.84.51037.83.17208Tl3.058min1290.524.11523.922.11801.349.6212Po300x10-9 s8954.12100208Pb稳定表 2铀系衰变链核素名称1/2）衰变类型主要能量（ Kev）分支比（ %）半衰期（ T4106.70.13238U4.468x10 9a4220.222.334269.777.54851.6234Th24.10d1

3、056.510614.1234Pa234U230Th226Ra222Rn218Po214Pb19877.82990.00383320.01083580.0452.12241.006226997.5992.455x10 5 a4722.428.424774.671.3844620.523.407.538x10 a4687.076.301600a46016.164784.393.843.82d49860.0785489.4899.923.098min51810.0016002.499.97948.32.75143.11.0426.8min205.545.9225.640.2334.911.0527

4、30.0012254520.011355160.0082248.21.244214Bi19.9min260.92.78385.14.345424.62.45525.316.96539.417.571268.819.10214Po163.6us6902.20.017686.8299.994772568767424210Tl1.3min74310877.1101635301762.620210Pb22.2a4.168416.1616210Bi5.012d389100210Po138.4d4516.580.001045304.33100206Pb表 3锕系衰变链核素名称半衰期（ T1/2 ）衰变类型

5、主要能量（Kev）分支比（ %）4215.86.014322.93.524364.318.92235U7.038x10 8a4395.457.734414.93.094502.51.284556.13.824597.44.7737.82.655.912.1231Th25.52h58.61.379.81280.14085.33246811.547131.26847368.448531.449343231Pa3.276x10 4 a4951.322.849861.45013.825.45028.42050322.55058.61147680.025227Ac21.77 a47960.0144855

6、0.0834872.70.0874940.70.5464953.260.6585.11108.983511.3754292.510.1223Fr22.0min350.415.0361.77056682.0656931.505700.83.635708.88.35713.24.89227Th18.68d5756.8720.45807.51.275866.62.425959.73.05977.723.56008.82.9603824.2223Ra11.43d219Rn3.96s215Po1.781ms211Pb36.1min（99.724%）211Bi2.14min（0.276%）207Tl4.77min5433.62.225501.61.05539.89.05606.725.25716.251.65747.09.05871.31.06425.07.506552.612.96819.179.465890.00268020.001669540.0607386.199.9971.30.83160.26.28313.71.63471.391.326