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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
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

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
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
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

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
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

 

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.