TABLE 2. Recommended X-ray energies and emission probabilities ordered by radionuclide

Data uncertainties are defined as standard deviations corresponding to the 1σ.

Nuclide

Origin

Energy (keV)

Emission probability per decay

19-K-40

Ar

K

2.96 - 3.19

0.00997

± 0.00022

21-Sc-46

Ti

K

4.51

0.000047

± 0.000002

24-Cr-51

V

Kα

4.94 - 4.95

0.202

± 0.003

V

Kβ

5.43 - 5.46

0.0269

± 0.0007

25-Mn-54

Cr

Kα

5.405 - 5.415

0.00227

± 0.00003

Cr

Kβ

5.947

0.000305

± 0.000007

26-Fe-55

Mn

L

0.556 - 0.721

0.0066

± 0.0010

Mn

Kα₂

5.8877

0.0845

± 0.0014

Mn

Kα₁

5.8988

0.1656

± 0.0027

Mn

Kβ'₁

6.49 - 6.54

0.0340

± 0.0007

26-Fe-59

Co

Kα

6.92

0.000177

± 0.000003

27-Co-56

Fe

Kα₂

6.39091

± 0.00005

0.0753

± 0.0010

Fe

Kα₁

6.40391

± 0.00003

0.1475

± 0.0017

Fe

Kβ'₁

7.058 - 7.108

0.0305

± 0.0005

27-Co-57

Fe

L

0.61 - 0.79

0.0155

± 0.0013

Fe

Kα₂

6.39084

0.168

± 0.003

Fe

Kα₁

6.40384

0.332

± 0.005

Fe

Kβ'₁

7.058 - 7.108

0.071

± 0.002

27-Co-58

Fe

Kα

6.40

0.235

± 0.003

Fe

Kβ

7.06

0.0320

± 0.0010

27-Co-60

Ni

Kα

7.46 - 7.48

0.000098

± 0.000003

Ni

Kβ

8.26 - 8.33

0.0000136

± 0.0000005

29-Cu-64

Ni

Kα

7.46 - 7.48

0.1415

± 0.0017

Ni

Kβ

8.26 - 8.33

0.0195

± 0.0004

30-Zn-65

Cu

Kα

8.03 - 8.05

0.347

± 0.003

Cu

Kβ

8.90 - 8.98

0.0482

± 0.0007

31-Ga-66

Zn

Kα₂

8.61587

± 0.00005

0.058

± 0.003

Zn

Kα₁

8.63896

± 0.00005

0.113

± 0.006

Zn

Kβ'₁

9.57 - 9.65

0.0242

± 0.0012

31-Ga-67

Zn

L

0.884 - 1.107

0.0182

± 0.0012

Zn

Kα₂

8.61587

± 0.00005

0.170

± 0.006

Zn

Kα₁

8.63896

± 0.00005

0.330

± 0.011

Zn

Kβ'₁

9.57 - 9.65

0.0709

± 0.0020

31-Ga-68

Zn

Kα₂

8.61587

± 0.00005

0.01389

± 0.00007

Zn

Kα₁

8.63896

± 0.00005

0.02701

± 0.00024

34-Se-75

As

L

1.28

0.0206

± 0.0007

As

Kα₂

10.5080

0.1659

± 0.0023

As

Kα₁

10.5437

0.322

± 0.004

As

Kβ

11.72 - 11.86

0.0764

± 0.0012

36-Kr-85

Te

Kα

13.356

0.0000158

± 0.0000028

38-Sr-85

Rb

L

1.58 - 2.20

0.0255

± 0.0007

Rb

Kα₂

13.3359

± 0.0002

0.1716

± 0.0017

Rb

Kα₁

13.3955

± 0.0001

0.3304

± 0.0029

Rb

Kβ'₁

14.95 - 15.09

0.0804

± 0.0010

Rb

Kβ'₂

15.19 - 15.21

0.0093

± 0.0004

39-Y-88

Sr

L

1.6 - 2.2

0.0277

± 0.0008

Sr

Kα₂

14.0980

± 0.0001

0.1730

± 0.0022

Sr

Kα₁

14.1652

± 0.0002

0.332

± 0.004

Sr

Kβ'₁

15.8359

± 0.0004

0.0821

± 0.0012

Sr

Kβ'₂

16.0847

± 0.0006

0.0107

± 0.0004

41-Nb-93m

Nb

L

1.90 - 2.66

0.0289

± 0.0013

Nb

Kα₂

16.5213

0.0316

± 0.0007

Nb

Kα₁

16.6152

0.0604

± 0.0012

Nb

Kβ'₁

18.618

0.0156

± 0.0005

Nb

Kβ'₂

18.953

0.0023

± 0.0001

41-Nb-95

Mo

L

2.01 - 2.83

0.000055

± 0.000009

Mo

Kα₂

17.374

0.000286

± 0.000009

Mo

Kα₁

17.479

0.000546

± 0.000017

Mo

Kβ'₁

19.59 - 19.77

0.000143

± 0.000005

Mo

Kβ'₂

19.96 - 20.00

0.0000220

± 0.0000011

42-Mo-99/43-Tc-99m

Tc

L

2.424 - 2.537

0.00697

± 0.00017

Tc

Kα₂

18.2510

0.0319

± 0.0009

Tc

Kα₁

18.3672

0.0606

± 0.0016

Tc

Kβ'₁

20.60 - 20.79

0.0161

± 0.0005

Tc

Kβ'₂

21.00 - 21.04

0.00254

± 0.00011

43-Tc-99m

Tc

L

2.424 - 2.537

0.00482

± 0.00012

Tc

Kα₂

18.2510

0.0222

± 0.0007

Tc

Kα₁

18.3672

0.0421

± 0.0012

Tc

Kβ'₁

20.60 - 20.79

0.0112

± 0.0004

Tc

Kβ'₂

21.00 - 21.04

0.00177

± 0.00008

44-Ru-103

Rh

L

2.38 - 3.36

0.0412

± 0.0019

Rh

Kα₂

20.074

0.0248

± 0.0015

Rh

Kα₁

20.216

0.047

± 0.003

Rh

Kβ'₁

22.699 - 22.911

0.0128

± 0.0008

Rh

Kβ'₂

23.172 - 23.217

0.00212

± 0.00015

47-Ag-110m

Ag

Kα₂

21.9906

0.00198

± 0.00012

Ag

Kα₁

22.1632

0.00372

± 0.00022

Ag

Kβ'₁

24.912 - 25.146

0.00103

± 0.00007

Ag

Kβ'₂

25.457 - 25.512

0.000179

± 0.000012

Cd

Kα₂

22.9843

0.00153

± 0.00009

Cd

Kα₁

23.1738

0.00288

± 0.00016

Cd

Kβ'₁

26.061 - 26.304

0.00080

± 0.00005

Cd

Kβ'₂

26.64 - 26.70

0.000146

± 0.000009

48-Cd-109

Ag

L

2.63 - 3.75

0.1034

± 0.0026

Ag

Kα₂

21.9906

± 0.0002

0.2899

± 0.0025

Ag

Kα₁

22.1632

± 0.0001

0.547

± 0.004

Ag

Kβ'₁

24.912 - 25.146

0.1514

± 0.0018

Ag

Kβ'₂

25.457 - 25.512

0.0263

± 0.0010

49-In-111

Cd

L

2.76 - 3.95

0.068

± 0.002

Cd

Kα₂

22.9843

0.236

± 0.002

Cd

Kα₁

23.1738

0.444

± 0.003

Cd

Kβ'₁

26.061 - 26.304

0.124

± 0.004

Cd

Kβ'₂

26.64 - 26.70

0.023

± 0.001

50-Sn-113

In

L

2.90 - 4.23

0.086

± 0.003

In

Kα₂

24.0020

0.2785

± 0.0022

In

Kα₁

24.2097

0.522

± 0.004

In

Kβ'₁

27.238 - 27.499

0.1460

± 0.0012

In

Kβ'₂

27.861 - 27.940

0.0284

± 0.0002

51-Sb-125

Te

Kα₂

27.2020

± 0.0002

0.191

± 0.007

Te

Kα₁

27.4726

± 0.0002

0.357

± 0.012

Te

Kβ'₁

30.945 - 31.236

0.102

± 0.004

Te

Kβ'₂

31.701 - 31.774

0.0221

± 0.0010

52-Te-123m

Te

L

3.34 - 4.93

0.0826

± 0.0021

Te

Kα₂

27.2020

0.140

± 0.005

Te

Kα₁

27.4726

0.260

± 0.009

Te

Kβ'₁

30.945 - 31.241

0.0743

± 0.0026

Te

Kβ'₂

31.701 - 31.812

0.0161

± 0.0007

53-I-123

Te

L

3.34 - 4.93

0.0772

± 0.0016

Te

Kα₂

27.2020

0.2469

± 0.0020

Te

Kα₁

27.4726

0.4598

± 0.0029

Te

Kβ'₁

30.945 - 31.241

0.1316

± 0.0017

Te

Kβ'₂

31.701 - 31.812

0.0386

± 0.0008

53-I-125

Te

L

3.34 - 4.93

0.149

± 0.007

Te

Kα₂

27.2020

± 0.0002

0.397

± 0.006

Te

Kα₁

27.4726

± 0.0002

0.740

± 0.011

Te

Kβ'₁

30.945 - 31.241

0.212

± 0.004

Te

Kβ'₂

31.701 - 31.812

0.0459

± 0.0014

53-I-129

Xe

L

3.6 - 5.4

0.079

± 0.004

Xe

Kα₂

29.459

± 0.002

0.201

± 0.003

Xe

Kα₁

29.779

± 0.001

0.372

± 0.006

Xe

Kβ'₁

33.56 - 33.88

0.103

± 0.004

Xe

Kβ'₂

34.41 - 34.55

0.0230

± 0.0013

53-I-131

Xe

Kα

29.70

0.044

± 0.014

Xe

Kβ

33.56 - 34.55

0.01025

± 0.00011

55-Cs-137

Ba

L

3.954 - 5.973

0.0090

± 0.0005

Ba

Kα₂

31.8174

0.0195

± 0.0004

Ba

Kα₁

32.1939

0.0359

± 0.0007

Ba

Kβ'₁

36.31 - 36.67

0.01055

± 0.00022

Ba

Kβ'₂

37.26 - 37.43

0.00266

± 0.00008

56-Ba-133

Cs

L

3.80 - 5.70

0.160

± 0.008

Cs

Kα₂

30.625

0.340

± 0.004

Cs

Kα₁

30.973

0.628

± 0.007

Cs

Kβ'₁

34.92 - 35.26

0.182

± 0.002

Cs

Kβ'₂

35.82 - 35.97

0.046

± 0.001

58-Ce-139

La

L

4.124 - 6.252

0.120

± 0.006

La

Kα₂

33.0344

± 0.0002

0.225

± 0.003

La

Kα₁

33.4421

± 0.0001

0.412

± 0.004

La

Kβ'₁

37.721 - 38.095

0.1230

± 0.0018

La

Kβ'₂

38.730 - 38.910

0.0311

± 0.0006

58-Ce-141

Pr

L

4.45 - 6.81

0.0243

± 0.0010

Pr

Kα₂

35.5506

± 0.0002

0.0474

± 0.0011

Pr

Kα₁

36.0267

± 0.0002

0.0865

± 0.0012

Pr

Kβ'₁

40.65 - 41.05

0.0263

± 0.0005

Pr

Kβ'₂

41.77 - 41.97

0.00674

± 0.00018

58-Ce-144/59-Pr-144

Pr

L

4.45 - 6.81

0.0142

± 0.0014

Pr

Kα₂

35.5506

± 0.0003

0.0256

± 0.0011

Pr

Kα₁

36.0267

± 0.0004

0.0469

± 0.0019

Pr

Kβ'₁

40.65 - 41.05

0.0141

± 0.0006

Pr

Kβ'₂

41.77 - 41.97

0.00360

± 0.00015

62-Sm-153

Eu

L

5.18 - 8.03

0.1004

± 0.0015

Eu

Kα₂

40.9024

0.163

± 0.003

Eu

Kα₁

41.5427

0.293

± 0.004

Eu

Kβ'₁

46.90 - 48.27

0.0920

± 0.0014

Eu

Kβ'₂

48.39 - 48.50

0.0236

± 0.0011

63-Eu-152

Sm

L

5.61 - 7.18

0.130

± 0.004

Sm

Kα₂

39.5229

0.208

± 0.003

Sm

Kα₁

40.1186

0.377

± 0.005

Sm

Kβ'₁

45.289 - 45.731

0.1178

± 0.0019

Sm

Kβ'₂

46.575 - 46.813

0.0304

± 0.0008

63-Eu-154

Gd

L

5.36 - 8.10

0.071

± 0.003

Gd

Kα₂

42.3093

0.072

± 0.002

Gd

Kα₁

42.9967

0.130

± 0.003

Gd

Kβ'₁

48.556 - 49.053

0.041

± 0.001

Gd

Kβ'₂

49.961 - 50.219

0.0108

± 0.0003

63-Eu-155

Gd

L

5.36 - 8.10

0.075

± 0.005

Gd

Kα₂

42.3093

0.0670

± 0.0013

Gd

Kα₁

42.9967

0.1205

± 0.0023

Gd

Kβ'₁

48.556 - 49.053

0.0384

± 0.0011

Gd

Kβ'₂

49.961 - 50.219

0.0098

± 0.0003

67-Ho-166

Er

L

6.15 - 9.43

0.076

± 0.004

Er

Kα₂

48.2215

± 0.0003

0.0291

± 0.0010

Er

Kα₁

49.1282

± 0.0004

0.0516

± 0.0017

Er

Kβ'₁

55.50 - 56.04

0.0168

± 0.0006

Er

Kβ'₂

57.21 - 57.46

0.00436

± 0.00018

67-Ho-166m

Er

L

6.15 - 9.43

0.201

± 0.009

Er

Kα₂

48.2215

± 0.0003

0.1071

± 0.0018

Er

Kα₁

49.1282

± 0.0004

0.190

± 0.003

Er

Kβ'₁

55.50 - 56.04

0.0617

± 0.0012

Er

Kβ'₂

57.21 - 57.46

0.0161

± 0.0005

69-Tm-170

Yb

L

6.55 - 10.14

0.0322

± 0.0013

Yb

Kα₂

51.3541

0.0095

± 0.0004

Yb

Kα₁

52.3887

0.0167

± 0.0007

Yb

Kβ'₁

59.1593 - 59.8045

0.0055

± 0.0003

Yb

Kβ'₂

60.962 - 61.309

0.00144

± 0.00007

70-Yb-169

Tm

L

6.34 - 9.78

0.494

± 0.008

Tm

Kα₂

49.773

0.529

± 0.008

Tm

Kα₁

50.742

0.935

± 0.013

Tm

Kβ'₁

57.304 - 57.925

0.306

± 0.006

Tm

Kβ'₂

59.100 - 59.357

0.0795

± 0.0021

77-Ir-192

Os

L

78.2 - 12.92

0.01525

± 0.00025

Os

Kα₂

61.4873

± 0.0007

0.01211

± 0.00025

Os

Kα₁

63.0011

± 0.0006

0.0209

± 0.0005

Os

Kβ'₁

71.078 - 71.895

0.00710

± 0.00021

Os

Kβ'₂

73.387 - 73.808

0.00180

± 0.00006

Pt

L

9.4 - 13.8

0.0396

± 0.0006

Pt

Kα₂

65.123

± 0.004

0.0266

± 0.0005

Pt

Kα₁

66.833

± 0.002

0.0455

± 0.0008

Pt

Kβ'₁

75.369 - 76.234

0.0158

± 0.0003

Pt

Kβ'₂

77.786 - 78.341

0.00411

± 0.00010

79-Au-198

Hg

L

8.72 - 14.85

0.0120

± 0.0005

Hg

Kα₂

68.8952

± 0.0012

0.00809

± 0.00008

Hg

Kα₁

70.8196

± 0.0012

0.01372

± 0.00012

Hg

Kβ'₁

79.82 - 80.76

0.00466

± 0.00008

Hg

Kβ'₂

82.43 - 83.03

0.00136

± 0.00004

80-Hg-203

Tl

L

8.953 - 14.738

0.0543

± 0.0009

Tl

Kα₂

70.8325

± 0.0008

0.0375

± 0.0004

Tl

Kα₁

72.8725

± 0.0008

0.0633

± 0.0006

Tl

Kβ'₁

82.118 - 83.115

0.0215

± 0.0004

Tl

Kβ'₂

84.838 - 85.530

0.0064

± 0.0002

81-Tl-201

Hg

L

8.72 - 14.85

0.427

± 0.018

Hg

Kα₂

68.8952

± 0.0011

0.273

± 0.005

Hg

Kα₁

70.8196

± 0.0012

0.464

± 0.007

Hg

Kβ'₁

79.82 - 80.76

0.157

± 0.004

Hg

Kβ'₂

82.43 - 83.03

0.0461

± 0.0013

83-Bi-207

Pb

L

9.18 - 15.84

0.332

± 0.014

Pb

Kα₂

72.805

0.2169

± 0.0024

Pb

Kα₁

74.970

0.365

± 0.004

Pb

Kβ'₁

84.451 - 85.470

0.1246

± 0.0023

Pb

Kβ'₂

87.238 - 88.003

0.0376

± 0.0010

90-Th-228 decay chain

Ra

Ll

10.622

0.00166

± 0.00009

Ra

Lα

12.196 - 12.339

0.0286

± 0.0015

Ra

Lβη

13.662 - 15.447

0.047

± 0.003

Ra

Lγ

17.848 - 18.412

0.0102

± 0.0006

Bi

L

9.420 - 15.709

0.145

± 0.004

Bi

Kα₂

74.8157

± 0.0009

0.107

± 0.003

Bi

Kα₁

77.1088

± 0.0010

0.179

± 0.005

Bi

Kβ'₁

86.835 - 87.862

0.0612

± 0.0020

Bi

Kβ'₂

89.732 - 90.522

0.0187

± 0.0007

Pb

L

9.184 - 15.216

0.0104

± 0.0002 *

Pb

Kα₂

72.8049

± 0.0008

0.0077

± 0.0002 *

Pb

Kα₁

74.9700

± 0.0009

0.0130

± 0.0003 *

Pb

Kβ'₁

84.451 - 85.470

0.0044

± 0.0002 *

Pb

Kβ'₂

87.238 - 88.003

0.00134

± 0.00005 *

Tl

Ll

8.953

0.00169

± 0.00009

Tl

Lα

10.172 - 10.268

0.0326

± 0.0017

Tl

Lβη

10.994 - 12.643

0.0272

± 0.0015

Tl

Lγ

14.291 - 14.738

0.0050

± 0.0002

95-Am-241

Np

Ll

11.89

± 0.02

0.00848

± 0.00010

Np

Lα

13.90

± 0.02

0.1303

± 0.0010

Np

Lβη

17.81

± 0.02

0.1886

± 0.0015

Np

Lγ

20.82

± 0.02

0.0481

± 0.0004

95-Am-243

Np

Ll

11.871

0.00445

± 0.00014

Np

Lα

13.761 - 13.946

0.0705

± 0.0020

Np

Lη

15.861

0.00126

± 0.00004

Np

Lβ

16.109 - 17.992

0.0818

± 0.0016

Np

Lγ

20.784 - 21.491

0.0197

± 0.0004

* adjusted for ²¹²Bi α branching fraction in order to express per ²²⁸Th decay