Nuclear Data for Safeguards

B-3.
K X-ray energies and intensities for fission products

Nuclide

Half-life
1 y = 1 year = 365.24219878 days

Decay

Origin

Energy
[keV]

Emission probabiliy
P_x [% decay]

Source

41-Nb-95m

3.61 ± 0.03 d

Nb Kα₁

Nb Kα₂

Nb K'β₁

Nb K'β₂

16.615

16.521

18.607 - 18.780

18.952 - 18.982

23.9 ± 1.0

12.5 ± 0.6

6.19 ± 0.27

0.93 ± 0.05

LNHB

44-Ru-103

39.247 ± 0.013 d

β^-

Rh L

Rh Kα₁

Rh Kα₂

Rh K'β₁

Rh K'β₂

2.38 - 3.36

20.216

20.074

22.699 - 22.911

23.172 - 23.217

4.12 ± 0.19

4.7 ± 0.3

2.48 ± 0.15

1.28 ± 0.08

0.212 ± 0.015

IAEA-CRP-XG

51-Sb-125

2.7584 ± 0.0006 y

β^-

Te Kα₁

Te Kα₂

Te K'β₁

Te K'β₂

27.4726±0.0002

27.2020±0.0002

30.945 - 31.236

31.701 - 31.774

35.7 ± 1.2

19.1 ± 0.7

10.2 ± 0.4

2.21 ± 0.10

IAEA-CRP-XG

53-I-129

( 5.89 ± 0.23 ) x 10⁹ d

β^-

Xe L

Xe Kα₁

Xe Kα₂

Xe K'β₁

Xe K'β₂

3.64 - 5.30

29.779±0.001

29.459±0.002

33.56 - 33.88

34.41 - 34.55

7.9 ± 0.4

37.2 ± 0.6

20.1 ± 0.3

10.3 ± 0.4

2.30 ± 0.13

IAEA-CRP-XG

53-I-131

8.0233 ± 0.0019 d

β^-

Xe L

Xe Kα₁

Xe Kα₂

Xe K'β₁

Xe K'β₂

3.64 - 5.30

29.779±0.001

29.459±0.002

33.56 - 33.88

34.41 - 34.55

0.635 ± 0.013

2.85 ± 0.07

1.54 ± 0.04

0.826 ± 0.021

0.195 ± 0.007

LNHB

54-Xe-131m

11.930 ± 0.016 d

Xe L

Xe Kα₁

Xe Kα₂

Xe K'β₁

Xe K'β₂

3.64 - 5.30

29.779±0.001

29.459±0.002

33.56 - 33.88

34.41 - 34.55

8.13 ± 0.21

28.5 ± 1.3

15.4 ± 0.7

8.3 ± 0.4

1.95 ± 0.10

LNHB

55-Cs-137

30.05 ± 0.08 y

β^-

Ba L

Ba Kα₂

Ba Kα₁

Ba K'β₁

Ba K'β₂

3.954 - 5.973

31.8174

32.1939

36.31 - 36.67

37.26 - 37.43

0.90 ± 0.05

1.95 ± 0.04

3.59 ± 0.07

1.055 ± 0.022

0.266 ± 0.008

IAEA-CRP-XG

58-Ce-141

32.508 ± 0.010 d

β^-

Pr L

Pr Kα₂

Pr Kα₁

Pr K'β₁

Pr K'β₂

4.45 - 6.81

35.5506±0.0002

36.0267±0.0002

40.65 - 41.05

41.77 - 41.97

2.43 ± 0.10

4.74 ± 0.11

8.65 ± 0.12

2.63 ± 0.05

0.674 ± 0.018

IAEA-CRP-XG

58-Ce-144

285.1 ± 0.6 d

β^-

Pr L

Pr Kα₂

Pr Kα₁

Pr K'β₁

Pr K'β₂

4.45 - 6.81

35.5506±0.0002

36.0267±0.0002

40.65 - 41.05

41.77 - 41.97

1.42 ± 0.14

2.56 ± 0.11

4.69 ± 0.19

1.41 ± 0.06

0.360 ± 0.015

IAEA-CRP-XG

59-Pr-144

17.28 ± 0.05 m

β^-

Pr L

Pr Kα₂

Pr Kα₁

Pr K'β₁

Pr K'β₂

4.45 - 6.81

35.5506±0.0002

36.0267±0.0002

40.65 - 41.05

41.77 - 41.97

1.42 ± 0.14

2.56 ± 0.11

4.69 ± 0.19

1.41 ± 0.06

0.360 ± 0.015

IAEA-CRP-XG

62-Sm-153

1.938 ± 0.010 d

β^-

Eu L

Eu Kα₂

Eu Kα₁

Eu K'β₁

Eu K'β₂

5.18 - 8.03

40.9024

41.5427

46.90 - 48.27

48.39 - 48.50

10.04 ± 0.15

16.3 ± 0.3

29.3 ± 0.4

9.20 ± 0.14

2.36 ± 0.11

IAEA-CRP-XG

63-Eu-152

( 4.941 ± 0.007 ) x 10³ d

Sm L

Sm Kα₂

Sm Kα₁

Sm K'β₁

Sm K'β₂

5.61 - 7.18

39.5229

40.1186

45.289 - 45.731

46.575 - 46.813

13.0 ± 0.4

20.8 ± 0.3

37.7 ± 0.5

11.78 ± 0.19

3.04 ± 0.08

IAEA-CRP-XG

63-Eu-154

( 3.1381 ± 0.0014 ) x 10³ d

β^-

Gd L

Gd Kα₁

Gd Kα₂

Gd K'β₁

Gd K'β₂

5.36 - 8.10

42.9967

42.3093

48.556 - 49.053

49.961 - 50.219

7.1 ± 0.3

13.0 ± 0.3

7.2 ± 0.2

4.1 ± 0.1

1.08 ± 0.03

IAEA-CRP-XG

63-Eu-155

4.753 ± 0.016 y

β^-

Gd L

Gd Kα₁

Gd Kα₂

Gd K'β₁

Gd K'β₂

5.36 - 8.10

42.9967

42.3093

48.556 - 49.053

49.961 - 50.219

7.5 ± 0.5

12.05 ± 0.23

6.70 ± 0.13

3.84 ± 0.11

0.98 ± 0.03

IAEA-CRP-XG

References

LNHB

Laboratoire National Henri Becquerel, Recommended Data, http://www.nucleide.org/DDEP_WG/DDEPdata.htm,
5 June 2008.

IAEA-CRP-XG

M.-M. Bé, V.P. Chechev, R. Dersch, O.A.M. Helene, R.G. Helmer, M. Herman, S. Hlav ác , A. Marcinkowski,
G.L. Molnár, A.L. Nichols, E. Schönfeld, V.R. Vanin, M.J. Woods, IAEA CRP "Update of X Ray and Gamma Ray Decay Data Standards for Detector Calibration and Other Applications", IAEA Scientific and Technical Information report STI/PUB/1287, May 2007, International Atomic Energy Agency, Vienna, Austria, ISBN 92-0-113606-4.

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