RADIONUCLIDE
DATA SHEET
EUROPIUM 152
Chemical Symbol:
Eu-152
Half-Life:
13.517 years
Atomic Number:
63
Decay Constant:
0.05128 years-1
Mass Number:
152 (89 neutrons)
Decay Mode:
Electron Capture
U.S. NRC Exempt Quantity Limit:
1 μCi (37 kBq)
IAEA Exempt Quantity Limit:
2.7 μCi (100 kBq)
Gammas From Eu-152
(Low intensity gammas omitted)
Energy (keV)
Intensity (%)
121.7817
28.58
125.69
0.016
148.010
0.037
212.568
0.0198
244.6975
7.583
251.630
0.072
271.131
0.0729
275.449
0.0335
295.9392
0.447
315.174
0.0507
324.83
0.072
329.425
0.128
340.40
0.036
344.2785
26.5
367.7887
0.861
411.1163
2.234
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416.048
0.1100
440.86
0.0134
441.1
0.0133
443.96
0.327
443.965
2.821
482.31
0.0292
488.6792
0.419
493.508
0.0294
503.474
0.149
520.227
0.052
523.13
0.0150
526.881
0.0131
534.245
0.0427
556.56
0.0185
563.990
0.489
566.430
0.1290
586.2648
0.459
595.61
0.032
656.487
0.1448
664.78
0.0166
671.151
0.0195
674.675
0.172
675.1
0.0170
678.623
0.471 4
686.61
0.0193
688.670
0.857
696.87
0.016
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712.843
0.093
719.349
0.059
719.349
0.278
727.99
0.0112
764.900
0.215
768.944
0.094
778.904
12.942
794.81
0.0263
805.70
0.0123
810.451
0.320
839.36
0.0161
841.570
0.166
867.378
4.245
896.58
0.0669
901.181
0.086
905.9
0.0163
919.33
0.427
926.317
0.278
930.580
0.0729
958.63
0.0217
963.390
0.135
964.079
14.605
974.09
0.0141
990.19
0.0313
1005.272
0.646
1084
0.246
1085.869
10.207
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1089.737
1.727
1109.174
0.186
1112.074
13.644
1170.93
0.037
1206.11
0.0141
1212.948
1.422
1249.938
0.188
1261.343
0.0334
1292.778
0.105
1299.14
1.623
1348.1
0.0178
1363.77
0.0257
1408.006
21.005
1457.643
0.502
1528.103
0.281
X-rays From Eu-152
Energy (keV)
Intensity (%)
Assignment
4.993
0.226
Sm Ll
5.362
0.0029
Gd Ll
5.589
0.089
Sm Lh
5.610
0.60
Sm Lα2
5.636
5.4
Sm Lα1
6.026
0.0076
Gd Lα2
6.050
0.00111
Gd Lh
6.058
0.069
Gd Lα1
6.196
0.30
Sm Lβ4
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6.206
3.6
Sm Lβ1
6.317
0.49
Sm Lβ3
6.371
0.051
Sm Lβ6
6.587
1.15
Sm Lβ2
6.687
0.0033
Gd Lβ4
6.713
0.047
Gd Lβ1
6.832
0.0054
Gd Lβ3
6.867
0.00068
Gd Lβ6
7.102
0.0143
Gd Lβ2
7.183
0.60
Sm Lγ1
7.243
1.17E-04
Gd Lβ5
7.471
0.091
Sm Lγ2
7.489
0.130
Sm Lγ3
7.790
0.0080
Gd Lγ1
7.930
6.6E-05
Gd Lγ6
8.087
0.00103
Gd Lγ2
8.105
0.00145
Gd Lγ3
39.097
0.00536
Sm Ka3
39.522
21.1
Sm Ka2
40.118
38.3
Sm Kα1
41.864
7.7E-05
Gd Kα3
42.309
0.252
Gd Kα2
42.996
0.454
Gd Kα1
45.294
3.74
Sm Kβ3
45.414
7.24
Sm Kβ1
45.741
0.107
Sm Kβ5
46.578
2.39
Sm Kβ2
Page 5 of 8
46.705
0.91
Sm Kβ4
48.551
0.0450
Gd Kβ3
48.695
0.0872
Gd Kβ1
49.038
0.00137
Gd Kβ5
49.959
0.0292
Gd Kβ2
50.099
0.0113
Gd Kβ4
Betas From Eu-152
End-Point Energy (keV)
Intensity (%)
105.2
0.066
117.27
0.047
126.39
0.0213
144.06
0.0423
175.39
1.819
213.2
0.101
224.41
0.923
261.52
0.0211
268.59
0.054
294.87
2.085
344.51
24.92
384.78
2.43
485.82
0.0028
500.38
0.0282
502.56
0.859
504.15
0.0050
536.54
0.035
581.54
0.658
Page 6 of 8
640.45
17.41
695.62
13.78
709.63
0.26
730.52
0.011
788.42
21.73
833.19
0.076
851.33
0.237
888.26
0.315
1063.4
0.900
1063.85
1.3
1474.52
8.1
1507.82
0.9
1752.52
0.74
Page 7 of 8
Eu-152 Decay Scheme
Reference(s):
- Health Physics and Radiological Health, 4th Edition by Thomas E. Johnson PhD, Brian K. Birky Ph.D.
- National Nuclear Data Center database - http://www.nndc.bnl.gov/
- Table of Radioactive Isotopes (ToRI) database - http:/nucleardata.nuclear.lu.se/nucleardata/toi/
Prepared by:
Spectrum Techniques, LLC.
106 Union Valley Road
Oak Ridge, TN 37830
Phone: 865.482.9937
Fax: 865.483.0473
Email: [email protected]
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