Thorium: Properties


Isotopes
  Natural
Abun. (%)
Atomic
Mass
Half-
life
Decay Mode
/Energy (/MeV)
Part. En.
/Intensity
(MeV/%)
Cross-sect.
Ther. Neut.
(b)
Spin
(h/2 pi)
Magnetic
Dipl.Mom.
(nm)
Electric
Quad. Mom.
(b)
Gamma En.
/Intensity
(MeV/%)
 212Th   212.01289 30ms alpha 7.8  0+      
 213Th   213.01294 0.14s alpha/ 7.84 7.692         
 214Th   214.01143 0.09s alpha/ 7.825 7.677  0+      
 215Th   215.01169 1.2s alpha/ 7.66 7.33/ 8
7.395/ 52
7.524/ 40
 1/2-      
 216mTh     0.18ms alpha           
 216Th   216.01103 28ms alpha/ 8.071 7.921  0+      
 217Th   217.01305 0.25ms alpha/ 9.424 9.25         
 218Th   218.013252 0.11Ás alpha/ 9.847 9.665  0+      
 219Th   219.01551 1.05Ás alpha/ 9.51 9.34         
 220Th   220.015724 10Ás alpha/ 8.953 8.79  0+      
 221Th   221.01816 1.7ms alpha/ 8.628 7.743/ 6
8.146/ 56
8.4274/ 39
        
 222Th   222.018447 2.8ms alpha/ 8.129 7.982  0+      
 223Th   223.020659 0.65s alpha/ 7.454 7.287/ 60
7.317/ 40
        
 224Th   224.021449 1.05s alpha/ 7.305 6.768/ 1.2
6.997/ 19
7.17/ 79
        
 225Th   225.023922 8.72m E.C./ 0.668
alpha/ 6.92
 
6.441/ 15
6.479/ 43
6.501/ 14
6.796/ 9
 3/2+      
 226Th   226.024885 30.6m alpha/ 6.454 6.026/ 0.2
6.041/ 0.19
6.098/ 1.3
6.2283/ 23
6.3375/ 75
 0+     Ra k x rays
0.1111
0.131
0.19028
0.20621
0.2421
0.1 - 0.8
 227Th   227.027703 28.72d alpha/ 6.146    3/2+     Ra k x rays
0.05014
0.23597
0.25624
0.02 - 1
 228Th   228.028715 1.913y alpha/ 5.52 5.177/ 0.18
5.2114/ 0.4
5.3405/ 26.7
5.4233/ 73
120 b0+      
 229Th   229.031755 7900y alpha/ 5.168 4.814/ 9.3
4.845/ 56
4.9008/ 10.2
4.689 - 5.077
60 b5/2+ 0.46 nm 4 b  
 230Th   230.033127 7.54x104y alpha/ 4.771 4.4383/ 0.03
4.4798/ 0.12
4.6211/ 23.4
4.6876/ 76.3
23.4 b0+      
 231Th   231.036298 1.063d -/ 0.39 0.138/ 22
0.218/ 20
0.305/ 52
 5/2+     Pa k x rays
0.02564
0.0842
0.02 - 0.3
 232Th 100 % 232.038054 1.4x1010y alpha/ 4.081 3.83/ 0.2
3.952/ 23
4.01/ 77
7.37 b0+     0.059
0.124
 233Th   233.041577 22.3m -/ 1.244 1.245 1500 b1/2+     Pa k x rays
0.02938
0.08653
0.4593
0.02 - 1.2
 234Th   234.043593 24.1d -/ 0.273 0.102/ 20
0.198/ 72
1.8 b0+     Pa k x rays
0.06329
0.09235
0.09278
 235Th   235.04751 7.2m -/ 1.92          0.4162
0.6594
0.7272
0.747
0.9318
 236Th     37.5m -/ 1          Pa k x rays
0.1107