Polonium: 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/%)
 192Po   191.99138 34ms alpha           
 193mPo     0.4s alpha           
 193Po   192.99111 0.5s alpha           
 194Po   193.98818 0.7s alpha 6.85  0+      
 195mPo     2s alpha 6.7         
 195Po   194.98801 5s alpha 6.61         
 196Po   195.98554 6s alpha,▀+,E.C. 6.52  0+      
 197mPo     26s alpha,▀+,E.C. 6.385  13/2+      
 197Po   196.9856 56s alpha,▀+,E.C./ 6.2 6.282  3/2-      
 198Po   197.98336 1.76m alpha,▀+,E.C./ 4 6.182  0+      
 199mPo     4.2m +,E.C.,alpha  
6.059
 13/2+ 1 nm   rad. an.
0.2745
0.4998
1.002
 199Po   198.98361 5.2m +,E.C./ 5.6
alpha
 
5.952
 3/2-     Bik x rays
0.1877
0.3616
1.0214
1.0344
 200Po   199.9817 11.5m +,E.C./ 3.4
alpha
 
5.863
 0+     0.14748
0.32792
0.6176
0.6709
 201mPo     8.9m +,E.C.,I.T./ 0.418    13/2+ 1 nm   Bik x rays
Po k x rays
0.2726
0.4123
0.4179
0.967
 201Po   200.98219 15.3m +,E.C./ 4.9
alpha
 
5.683
 3/2- 0.7 nm   Bik x rays
0.2056
0.225
0.8483
0.9048
 202Po   201.98068 45m +,E.C./ 2.8
alpha
 
5.588
 0+     0.041
0.1656
0.3158
0.6884
 203mPo     1.2m I.T./ 0.6414
-C.E.
   13/2+     Bik x rays
Po k x rays
0.6414
 203Po   202.98137 35m +,E.C./ 4.2    5/2- 0.74 nm   0.17516
0.21477
0.8935
0.90863
1.09095
 204Po   203.98028 3.53h E.C./ 2.4    0+     Bik x rays
0.2702
0.8844
1.0162
0.11 - 1.9
 205Po   204.98115 1.7h +,E.C./ 3.53    5/2- 0.76 nm 0.17 b Bik x rays
0.83681
0.84983
0.87241
1.00124
0.12 - 2.7
 206Po   205.980456 8.8d E.C./ 1.85
alpha
 
5.223
 0+     Bik x rays
0.28644
0.31156
0.51134
0.80737
1.03228
0.11 - 1.5
 207mPo     2.8s I.T./ 1.383    19/2-     Po k x rays
0.2682
0.30074
0.81448
 207Po   206.98157 5.8h E.C.,▀+/ 2.91    5/2- 0.79 nm 0.28 b Bik x rays
0.74263
0.91176
0.99225
 208Po   207.981222 2.898y alpha/ 5.213 4.233/ 0.0002
5.1158/ 100
 0+      
 209Po   208.982404 102y alpha/ 4.976 5.624/ 0.56
4.879/ 99.2
 1/2- 0.77 nm   0.26049
0.8964
 210Po   209.982848 138.38d alpha/ 5.407 4.516/ 0.001
5.304/ 100
 0+     0.80313
 211mPo     25.2s alpha 7.273/ 91
7.994/ 1.7
8.316/ 0.25
8.875/ 7
 25/2+     Pb k x rays
0.32808
0.56915
0.89723
1.0631
 211Po   210.986627 0.516s alpha/ 7.594 6.57/ 0.54
6.892/ 0.55
7.45/ 98.9
 9/2+     0.56915
0.89723
 212mPo     45s alpha 8.514/ 2
9.086/ 1
11.65/ 97
 16+   7.45 b  
9
0.56915
0.89723
 212Po   211.988842 0.298Ás alpha/ 8.953 8.784  0+     7.45/ 98.9
9
0.56915
0.89723
 213Po   212.992833 4Ás alpha/ 8.537 7.614/ 0.003
8.375/ 100
 9/2+      
9
0.56915
0.89723
 214Po   213.995176 163.7Ás alpha/ 7.833 6.904/ 0.01
7.686/ 99.99
 0+      
9
0.56915
0.89723
 215Po   214.999419 1.78ms alpha/ 7.526 6.95/ 0.02
6.957/ 0.03
7.386/ 100
 9/2+      
0.56915
0.89723
 216Po   216.001889 0.145s alpha/ 6.906 5.895/ 0.002
6.778/ 99.99
 0+     9
 217Po   217.0626   alpha/ 6.662 6.539    5 nm 6.778 b  
 218Po     3.04m alpha/ 6.114 5.181/ 1  0+ 5 nm 6.778 b