Radium Isotopic Data
Isotope |
Isotopic Mass amu |
% Abundance |
T1/2 |
T1/2 Units |
Mass Excess KeV |
Binding Energy Per Nucleon KeV |
Decay Mode |
Branching Ratio |
202Ra | 202.009891 (67) |
| 2.6 | ms | 9,213 (63) | 7,684.9 (3.1) | A | 100 |
203Ra | 203.009272 (87) |
| 4 | ms | 8,636 (81) | 7,689.6 (4) | A~100 |
|
204Ra | 204.006500 (17) |
| 60 | ms | 6,054 (15) | 7,704.16 (7.5) | A~100 |
|
205Ra | 205.006269 (93) |
| 220 | ms | 5,839 (86) | 7,707.0 (4.2) | A | ? |
206Ra | 206.003827 (19) |
| 240 | ms | 3,565 (18) | 7,719.81 (8.8) | A | 100 |
207Ra | 207.003798 (59) |
| 1.3 | s | 3,538 (55) | 7,721.6 (2.7) | A~90 |
|
208Ra | 208.001840 (17) |
| 1.3 | s | 1,714 (15) | 7,732.08 (7.4) | A | ? |
209Ra | 209.001991 (54) |
| 4.6 | s | 1,855 (50) | 7,733.0 (2.4) | A~90 |
|
210Ra | 210.000495 (16) |
| 3.7 | s | 461 (15) | 7,741.28 (7.2) | A | ? |
211Ra | 211.000898 (28) |
| 13 | s | 836 (26) | 7,741.1 (1.2) | A>93 |
|
212Ra | 211.999794 (12) |
| 13 | s | -191 (11) | 7,747.47 (5.3) | A | ? |
213Ra | 213.000384 (22) |
| 2.74 | m | 358 (20) | 7,746.42 (9.5) | A | 80 5 |
214Ra | 214.0001079 (99) |
| 2.46 | s | 100.5 (9.2) | 7,749.14 (4.3) | A~100 |
|
215Ra | 215.0027198 (82) |
| 1.55 | ms | 2,533.5 (7.6) | 7,739.32 (3.5) | A | 100 |
216Ra | 216.0035330 (94) |
| 182 | ns | 3,291.0 (8.8) | 7,737.35 (4.1) | A | 100 |
217Ra | 217.0063203 (92) |
| 1.63 | us | 5,887.3 (8.5) | 7,726.92 (3.9) | A | 100 |
218Ra | 218.007140 (12) |
| 25.6 | us | 6,651 (11) | 7,725.00 (5.1) | A | 100 |
219Ra | 219.0100851 (89) |
| 10 | ms | 9,394.2 (8.3) | 7,714.05 (3.8) | A | 100 |
220Ra | 220.0110284 (99) |
| 17.9 | ms | 10,272.9 (9.2) | 7,711.68 (4.2) | A | 100 |
221Ra | 221.0139173 (50) |
| 28 | s | 12,963.9 (4.7) | 7,701.13 (2.1) | A | |
222Ra | 222.0153745 (49) |
| 38 | s | 14,321.3 (4.6) | 7,696.69 (2.1) | A | 100 |
223Ra | 223.0185022 (27) |
| 11.43 | d | 17,234.7 (2.5) | 7,685.30 (1.1) | A | 100 |
224Ra | 224.0202118 (24) |
| 3.66 | d | 18,827.2 (2.2) | 7,679.92 (1) | A | 100 |
225Ra | 225.0236116 (32) |
| 14.9 | d | 21,994.0 (3) | 7,667.58 (1.3) | B- | 100 |
226Ra | 226.0254098 (25) |
| 1.6 | ky | 23,669.1 (2.3) | 7,661.96 (1) | A | 100 |
227Ra | 227.0291778 (25) |
| 42.2 | m | 27,179.0 (2.4) | 7,648.30 (1) | B- | 100 |
228Ra | 228.0310703 (26) |
| 5.75 | y | 28,941.8 (2.4) | 7,642.42 (1.1) | B- | 100 |
229Ra | 229.034958 (20) |
| 4 | m | 32,563 (19) | 7,628.48 (8.2) | B- | 100 |
230Ra | 230.037056 (13) |
| 93 | m | 34,518 (12) | 7,621.91 (5.3) | B- | 100 |
231Ra | 231.04122 (32) |
| 103 | s | 38,400 (300) | 7,607 (1) | B- | 100 |
232Ra | 232.04364 (30) |
| 250 | s | 40,650 (280) | 7,599 (1) | B- | 100 |
233Ra | 233.04806 (50) |
| 30 | s | 44,770 (470) | 7,584 (2) | B- | 100 |
234Ra | 234.05070 (53) |
| 30 | s | 47,230 (490) | 7,575 (2) | B- | 100 |
203mRa | 203.009272 (87) |
| 41 | ms | 8,636 (81) | 7,689.6 (4) | A~100 |
|
205mRa | 205.006269 (93) |
| 180 | ms | 5,839 (86) | 7,707.0 (4.2) | A | ? |
207mRa | 207.003798 (59) |
| 57 | ms | 3,538 (55) | 7,721.6 (2.7) | IT | 85# |
208mRa | 208.001840 (17) |
| 270 | ns | 1,714 (15) | 7,732.08 (7.4) | 0 |
|
210mRa | 210.000495 (16) |
| 2.24 | us | 461 (15) | 7,741.28 (7.2) | 0 |
|
212mRa | 211.999794 (12) |
| 10.9 | us | -191 (11) | 7,747.47 (5.3) | IT | 100 |
213mRa | 213.000384 (22) |
| 2.1 | ms | 358 (20) | 7,746.42 (9.5) | IT~99 |
|
215mRa | 215.0027198 (82) |
| 7.1 | us | 2,533.5 (7.6) | 7,739.32 (3.5) | IT | 100 |
231mRa | 231.04122 (32) |
| ~53 | us | 38,400 (300) | 7,607 (1) | IT | 100 |
215m1Ra | 215.0027198 (82) |
| 1.39 | us | 2,533.5 (7.6) | 7,739.32 (3.5) | IT | 100 |
Data Source: ENSDF March 2005
©Radiochemistry Society 2005