Europium Isotopic Data
Isotope |
Isotopic Mass amu |
% Abundance |
T1/2 |
T1/2 Units |
Mass Excess KeV |
Binding Energy Per Nucleon KeV |
Decay Mode |
Branching Ratio |
130Eu | 129.96357 (54) |
| 1.1 | ms | -33,940 (500) | 7,953 (4) | p | ? |
131Eu | 130.95775 (43) |
| 17.8 | ms | -39,350 (400) | 7,995 (3) | p | ? |
132Eu | 131.95437 (43) |
| 100 | ms | -42,500 (400) | 8,020 (3) | B+ ? |
|
133Eu | 132.94924 (32) |
| 200 | ms | -47,280 (300) | 8,056 (2) | B+ ? |
|
134Eu | 133.94651 (21) |
| 500 | ms | -49,830 (200) | 8,075 (1) | B+ | 100 |
135Eu | 134.94182 (32) |
| 1.5 | s | -54,190 (300) | 8,108 (2) | B+ | 100 |
136Eu | 135.93960 (21) |
| 3.3 | s | -56,260 (200) | 8,123 (1) | B+ | 100 |
137Eu | 136.93557 (21) |
| 8.4 | s | -60,020 (200) | 8,150 (1) | B+ | 100 |
138Eu | 137.933709 (30) |
| 12.1 | s | -61,750 (28) | 8,161.6 (2) | B+ | 100 |
139Eu | 138.929792 (14) |
| 17.9 | s | -65,398 (13) | 8,187.22 (9.5) | B+ | 100 |
140Eu | 139.928088 (55) |
| 1.51 | s | -66,986 (52) | 8,197.7 (3.7) | B+ | 100 |
141Eu | 140.924931 (14) |
| 40.7 | s | -69,927 (13) | 8,217.69 (9) | B+ | 100 |
142Eu | 141.923435 (33) |
| 2.36 | s | -71,320 (31) | 8,226.5 (2.2) | B+ | 100 |
143Eu | 142.920298 (12) |
| 2.59 | m | -74,242 (11) | 8,245.82 (7.7) | B+ | 100 |
144Eu | 143.918817 (12) |
| 10.2 | s | -75,622 (11) | 8,254.19 (7.5) | B+ | 100 |
145Eu | 144.9162652 (41) |
| 5.93 | d | -77,998.4 (3.8) | 8,269.32 (2.7) | B+ | 100 |
146Eu | 145.9172058 (67) |
| 4.61 | d | -77,122.3 (6.2) | 8,261.96 (4.3) | B+ | 100 |
147Eu | 146.9167461 (35) |
| 24.1 | d | -77,550.5 (3.2) | 8,263.58 (2.2) | B+~100 |
|
148Eu | 147.918086 (11) |
| 54.5 | d | -76,302 (10) | 8,253.85 (6.9) | B+ | 100 |
149Eu | 148.9179312 (47) |
| 93.1 | d | -76,446.6 (4.3) | 8,253.59 (2.9) | EC | |
150Eu | 149.9197018 (70) |
| 36.9 | y | -74,797.3 (6.5) | 8,241.38 (4.3) | B+ | 100 |
151Eu | 150.9198502 (26) | 47.81 (3) | stable |
| -74,659.1 (2.5) | 8,239.34 (1.6) |
|
|
152Eu | 151.9217445 (26) |
| 13.537 | y | -72,894.5 (2.5) | 8,226.62 (1.6) | B+ | 72.1 3 |
153Eu | 152.9212303 (26) | 52.19 (3) | stable |
| -73,373.5 (2.5) | 8,228.74 (1.6) |
|
|
154Eu | 153.9229792 (26) |
| 8.593 | y | -71,744.4 (2.5) | 8,217.14 (1.6) | B-~100 |
|
155Eu | 154.9228933 (27) |
| 4.7611 | y | -71,824.5 (2.5) | 8,216.72 (1.6) | B- | 100 |
156Eu | 155.9247522 (62) |
| 15.19 | d | -70,092.8 (5.8) | 8,204.68 (3.7) | B- | 100 |
157Eu | 156.9254236 (57) |
| 15.18 | h | -69,467.4 (5.3) | 8,199.85 (3.4) | B- | 100 |
158Eu | 157.927845 (83) |
| 45.9 | m | -67,212 (77) | 8,184.8 (4.9) | B- | 100 |
159Eu | 158.9290889 (79) |
| 18.1 | m | -66,053.3 (7.3) | 8,176.76 (4.6) | B- | 100 |
160Eu | 159.93197 (22) |
| 38 | s | -63,370 (200) | 8,159 (1) | B- | 100 |
161Eu | 160.93368 (32) |
| 26 | s | -61,780 (300) | 8,149 (2) | B- | 100 |
162Eu | 161.93704 (32) |
| 10.6 | s | -58,650 (300) | 8,129 (2) | B- | 100 |
163Eu | 162.93921 (54) |
| 6 | s | -56,630 (500) | 8,116 (3) | B- ? |
|
164Eu | 163.94299 (64) |
| 2 | s | -53,100 (600) | 8,095 (4) | B- ? |
|
165Eu | 164.94572 (75) |
| 1 | s | -50,560 (700) | 8,079 (4) | B- ? |
|
166Eu | 165.94997 (86) |
| 400 | ms | -46,600 (800) | 8,055 (5) | B- ? |
|
167Eu | 166.95321 (86) |
| 200 | ms | -43,590 (800) | 8,037 (5) | B- ? |
|
136mEu | 135.93960 (21) |
| 3.8 | s | -56,260 (200) | 8,123 (1) | B+ | 100 |
140mEu | 139.928088 (55) |
| 125 | ms | -66,986 (52) | 8,197.7 (3.7) | IT~100 |
|
141mEu | 140.924931 (14) |
| 2.7 | s | -69,927 (13) | 8,217.69 (9) | IT | 86 3 |
142mEu | 141.923435 (33) |
| 1.223 | m | -71,320 (31) | 8,226.5 (2.2) | B+ | 100 |
143mEu | 142.920298 (12) |
| 50 | us | -74,242 (11) | 8,245.82 (7.7) | IT | 100 |
144mEu | 143.918817 (12) |
| 1 | us | -75,622 (11) | 8,254.19 (7.5) | IT | 100 |
145mEu | 144.9162652 (41) |
| 490 | ns | -77,998.4 (3.8) | 8,269.32 (2.7) | IT | 100 |
146mEu | 145.9172058 (67) |
| 235 | us | -77,122.3 (6.2) | 8,261.96 (4.3) | IT | 100 |
150mEu | 149.9197018 (70) |
| 12.8 | h | -74,797.3 (6.5) | 8,241.38 (4.3) | B- | 89 2 |
151mEu | 150.9198502 (26) |
| 58.9 | us | -74,659.1 (2.5) | 8,239.34 (1.6) | 0 |
|
152mEu | 151.9217445 (26) |
| 9.3116 | h | -72,894.5 (2.5) | 8,226.62 (1.6) | B- | 72 4 |
154mEu | 153.9229792 (26) |
| 46.3 | m | -71,744.4 (2.5) | 8,217.14 (1.6) | IT | 100 |
152m1Eu | 151.9217445 (26) |
| 96 | m | -72,894.5 (2.5) | 8,226.62 (1.6) | IT | 100 |
Data Source: ENSDF March 2005
©Radiochemistry Society 2005