Radium: 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/%)
 206Ra   206.0038 0.4s alpha/ 7.416 7.272  0+      
 207Ra   207.00374 1.3s alpha/ 7.27 7.133         
 208Ra   208.00175 1.4s alpha/ 7.273 7.133  0+      
 209Ra   209.00193 4.6s alpha/ 7.15 7.008  5/2+ 0.87 nm 0.38 b  
 210Ra   210.00043 3.7s alpha/ 7.61 7.2  0+      
 211Ra   211.00086 13s alpha/ 7.046
E.C.
6.912  5/2- 0.878 nm 0.46 b  
 212Ra   211.99976 13s alpha/ 7.033 6.901  0+      
 213mRa     2.1ms I.T.           
 213Ra   213.00033 2.7m E.C./ 3.88
alpha/ 6.86
 
6.521/ 4.8
6.622/ 39
6.73/ 36
 1/2- 0.613 nm   0.1024
0.1101
0.2125
 214Ra   214.000079 2.46s alpha/ 7.272 7.136  0+      
 215Ra   215.002695 1.6ms alpha/ 8.864 7.883/ 2.8
8.171/ 1.4
8.7/ 95.9
 9/2+      
 216Ra   216.003509 0.18Ás alpha/ 9.526 9.349  0+      
 217Ra   217.006294 1.6Ás alpha/ 9.161 8.992  9/2-      
 218Ra   218.007117 26Ás alpha/ 8.547 8.39  0+      
 219Ra   219.010053 0.01s alpha/ 8.132 7.68/ 65
7.982/ 35
        
 220Ra   220.011004 25ms alpha/ 7.593 6.998/ 1
7.455/ 99
 0+     0.465
 221Ra   221.013889 29s alpha/ 6.879 6.578/ 3
6.585/ 8
6.608/ 35
6.669/ 21
6.758/ 31
 5/2+ -0.18 nm 1.9 b  
 222Ra   222.015353 38s alpha/ 5.59 6.237/ 3
6.556/ 97
 0+      
 223Ra   223.018501 11.435d alpha/ 5.979 5.433/ 2.3
5.54/ 9.2
5.607/ 24
5.716/ 52
5.747/ 9
130 b3/2+ 0.271 nm 1.2 b Rn k x rays
0.12231
0.14418
0.15418
0.15859
0.26939
0.32388
0.33328
0.44494
 224Ra   224.020186 3.66d alpha/ 5.789 5.034/ 0.003
5.047/ 0.007
5.164/ 0.007
5.449/ 4.9
5.685/ 95
 0+     Rn k x rays
0.2407
0.4093
0.6501
 225Ra   225.023604 14.9d -/ 0.371 0.32/ 100  3/2+ -0.734 nm   At k x rays
0.0434
 226Ra   226.025402 1599y alpha/ 4.87 4.194/ 0.001
4.343/ 0.006
4.601/ 5.5
4.784/ 94
13 b0+     Rn k x rays
0.1861
0.2624
 227Ra   227.02917 42m -/ 1.324 1.03/ 1.3  3/2+ -0.404 nm 1.5 b At k x rays
0.02739
 228Ra   228.031064 5.76y -/ 0.046   36 b0+     0.0135
0.016
 229Ra   229.03487 4m -/ 1.8 1.76  3/2+ 0.503 nm 3 b  
 230Ra   230.03699 1.5h -/ 0.9 0.7  0+     0.0631
0.072
0.2028
0.4698
0.4787
 231Ra     1.7m -           
 232Ra     4m -           
 234Ra     30s