Radionuclide Data

Principle Radiations Emitted From Commonly Used Radionuclides
Data Taken From NCRP Report 58, Feb. 1, 1985
(Except Where Noted)

Radionuclide
Half-Life
Decay Mode
Radiation Type
Energy, keV
Number Emitted
Per Decay
H-3
(Tritium)
12.35 y
Beta -
Beta 1
18.600 max
5.685 avg
1.00
C-14
5730 y
Beta -
Beta 1
156.475 max
49.469 avg
1.00
Na-22
2.602 y
Beta +
(Positron)
Positron 1
 

Electron Auger-K

X-Ray K

Gamma 1
Annihilation Photons

545.4 max
215.50 avg

0.82

0.84

1274.542
511.0

0.8984
 

0.092

0.0012

0.99940
1.7968

P-32
14.29 d
Beta -
Beta 1
1710.3 max
694.8 avg
1.00
P-33
25.34 d
Beta -
Beta 1
249.0 max
76.6 avg
1.00
S-35
87.44 d
Beta -
Beta 1
166.74 max
48.60 avg
1.00
Ca-45
163 d
Beta -
Beta 1
256.7 max
77.1 avg
1.00
Sc-46
83.79 d
Beta -
Beta 1
 

Gamma 1
Gamma 2

365.8 max
111.8 avg

889.277
1120.545

0.999964
 

0.999840
0.999870

Cr-51
27.702 d
Electron
Capture
Electron Auger-L
Electron Auger-K

Total Electrons

X-Ray L
X-Ray Ka2

X Ray Ka2

X Ray Kß

Total  X Rays

Gamma 1

0.47
4.38

 
 

0.5
4.94464

4.95220

5.43

 
 

320.0842

1.44
0.669

2.116

0.0033
0.0659

0.131

0.0264

0.2264

0.985

Fe-55
2.72 y
Electron
Capture
Electron Auger-L
Electron Auger-K

Total Electrons

X-Ray L
X-Rray Ka2

X-Ray Ka1

X-Ray Kß

Total X Rays

0.6
5.19

 
 

0.64
5.88765

5.89875

6.49

1.39
0.607

1.997

0.0042
0.82

0.163

0.0329

0.2821

Co-57
271.7 d
Electron
Capture
Electron Auger-L
Electron Auger-K

Electron ce-K-1

Electron ce-L-1

Electron ce-MNO-1

Electron ce-K-2

Electron ce-L-2

Electron ce-K-3

Electron ce-L-3

Total Electrons

X-Ray L
X-Ray Ka2

X-Ray Ka1

X-Ray Kß

Total X Ray

Gamma 1
Gamma 2

Gamma 3

Gamma 4

Total Gamma

0.67
5.62

7.3007

13.5666

14.3198

114.9494

121.2153

129.3623

135.6282

 
 

0.7
6.39084

6.40384

7

 
 

14.4127
122.0614

136.4743

692.00

249
105.5

69.6

7.79

1.15

1.87

0.183

1.40

0.140

4.36633

0.8
16.6

32.8

6.63

0.5683

0.954
0.856

0.1058

0.00160

1.0588

Fe-59
44.51 d
Beta -
Beta 1
 

Beta 2
 

Beta3
 

Total Beta

Gamma 1
Gamma 2

Gamma 3

Gamma 5

Gamma 6

(2 weak gammas omitted)

130.6 max
35.7 avg

273.3 max
80.9 avg

465.6 max
149.2 avg

116.5 avg

142.6520
192.349

334.80

1099.251

1291.596

0.0127
 

0.457
 

0.530
 

1.00

0.0100
0.0301

0.00271

0.563

0.437

Co-60
5.2714 y
Beta -
Beta 1
 

Gamma 3
Gamma 4

317.92 avg
95.80 max

1173.238
1332.501

0.99920
 

0.99900
0.999824

Ni-63
96 y
Beta -
Beta 1
65.88 max
17.13 avg
1.00
Sr-85
64.854 d
Electron
Capture
Electron Auger-L
Electron Auger-K

Electron ce-K-1

Total Electrons

X Ray L
X Ray Ka2

X Ray Ka1

X Ray Kß

Total X Rays

Gamma 1

1.68
11.4

498.809

 
 

1.69
13.33580

13.39530

15

 
 

514.009

1.082
0.291

0.00617

1.37917

0.016
0.171

0.330

0.0866

0.6036

0.980

Nb-95*
34.975 d
Beta -
Electron Auger-L
Electron Auger-K

Electron ce-K-1

Electron ce-K-3

Electron ce-L-3

Beta 1
 

Beta 2
 

Beta 3
 

Total Beta

X Ray L
X Ray Ka2

X Ray Ka1

X Ray ß

Gamma 1
Gamma 2

Gamma 3

2.270
14.80

184.120

745.807

762.942

925.6 max
321.94 avg

721.5 max
283.58 avg

159.8 max
43.36 avg

43.48 kev avg

2.29
17.37431

17.47930

19.60

204.12
561.88

765.790

0.00141
0.000304

0.000013

0.00128

0.000140

0.00030
 

0.00017
 

0.9997
 

1.0002

0.000059
0.000284

0.00543

0.000160

0.00028
0.00013

0.9981

Mo-99
65.92 h
Beta -
Electron ce-M-1*
Electron ce-NOP-1*

Electron Auger-L*

Electron Auger-K*

Electron ce-K-2

Electron ce-L-2

Electron ce-MNO-2

Electron ce-K-4*

Electron ce-K-5*

Electron ce-L-4*

Electron ce-L-5*

Electron ce-M-4*

Electron ce-K-8

Electron ce-L-8

Beta 1
 

Beta 2
 

Beta 3
 

Beta 4
 

Beta 5
 

Total Beta

X Ray L*
X Ray Ka2*

X Ray Ka1*

X Ray Kß*

Gamma 2
Gamma 4*

Gamma 8

Gamma 11

Gamma 25

Gamma 27

Gamma 28

25 weak gammas omitted

* From Daughter, Tc-99m

1.630
2.106

2.17

15.5

19.5395

37.5410

40.0395

119.4670

121.63

137.4685

139.63

139.9670

160.013

178.014

215.2 max
59.9 avg

353.0 max
104.3 avg

436.4 max
133.1 avg

847.9 max
289.7 avg

1214.3 max
442.8 avg

388.8  avg

2.42
18.2508

18.3671

20.6

40.58347
140.5110

181.057

366.421

739.500

777.921

822.972 









0.836
0.1173

0.155

0.031

0.0378

0.00458

0.00110

0.090

0.0067

0.0109

0.00207

0.00199

0.00765

0.00114

0.00111
 

0.00134
 

0.1655
 

0.0117
 

0.8193
 

0.9991

0.0073
0.0317

0.061

0.0182

0.0116
0.906

0.0607

0.01203

0.12223

0.0431

0.00133









Tc-99m
6.007 h
Internal
Transition
Electron ce-M-1
Electron ce-NOP-1

Auger-L

Auger -K

Electron ce-K-2

Electron ce-K-3

Electron ce-L-2

Electron ce-L-3

Electron ce-M-2

X ray L
X ray ka2

X ray ka1

X ray kß

Gamma 2

1.630
2.106

2.17

15.5

119.4670

121.63

137.4685

139.63

139.9670

2.42
18.2508

18.3671

20.6

140.5110

0.8684
0.1218

0.104

0.021

0.088

0.0069

0.0106

0.00215

0.00198

0.0049
0.0212

0.0406

0.0122

0.8897

Ru-106*
368.2 d
Beta -
Beta 1
 

Beta 2*
 

Beta 3*
 

Beta 4*
 

Beta 5*
 

Beta 6*
 

Beta 7*
 

Total Beta

Gamma 4*
Gamma 6*

Gamma 7*

Gamma 14*

Gamma 17*

Gamma 21*

Gamma 38*

*From Daughter, Rh-106

39.40 max
10.03 avg

1539 max
582 avg

1979 max
779 avg

2407 max
976 avg

2413 max
979 avg

3029 max
1267 avg

3541 max
1508 avg

1410 avg

511.85
616.17

621.84

873.6

1050.47

1128.02

1562.20

1.00
 

0.00460
 

0.00177
 

0.10
 

0.0064
 

0.081
 

0.786
 

1.00

0.206
0.0070

0.098

0.00416

0.0173

0.00396

0.00157

Cd-109
462.6 d
Electron
Capture
Electron Auger-L
Electron Auger-K

Electron ce-K-1

Electron ce-L-1

Electron ce-M-1

Electron ce-NOP-1

X Ray L
X Ray Ka2

X Ray Ka1

X Ray Kß

Gamma 1

2.6
18.5

62.5201

84.2283

87.3166

87.9389


21.9903

22.16290

24.9

88.0341

1.66
0.21

0.419

0.44

0.090

0.0160

0.11
0.291

0.551

0.178

0.0372

In-111
2.805 d
(67.32 h)
Electron
Capture
Electron
Electron

Electron

Electron

Electron

Electron

Electron

Electron

X Ray
X Ray

X Ray

X Ray

Gamma 1
Gamma 2

2.72
19.3

144.57

167.26

170.51

218.68

241.37

244.62

3.13
22.98410

23.17360

26

171.28
 245.39

1.00
0.16

0.0789

0.0096

0.00222

0.0503

0.00785

0.00182

0.070
0.235

0.444

0.145

0.9093
 0.9400

I-125
59.6 d
Electron
Capture
Electron
Electron

Electron

Electron

Electron

Electron

X Ray
X Ray

X Ray

X Ray

Gamma 1

3.19
3.6781

22.7

30.5527

34.4859

35.3256

3.77
27.2017

27.4723

31

35.4919

1.56
0.798

0.2

0.107

0.021

0.007

0.15
0.397

0.741

0.257

0.0667 

I-131
8.021 d
Beta -
Electron
Electron

Electron

Electron

Electron

Electron

Electron

Electron

Beta 1
 

Beta 2
 

Beta 3
 

Beta 4
 

Beta 5
 

Tota Beta

X Ray L
X Ray Ka2

X Ray Ka1

X Ray Kß

Gamma 1
Gamma 4

Gamma 7

Gamma 12

Gamma 14

Gamma 16

Gamma 17

Gamma 18

Gamma 19

 3.43
24.6

45.622

74.730

79.041

249.737

329.919

359.027

274.9 max
69.40 avg

303.9 max
87.00 avg

333.8 max
96.60 avg

606.3 max
191.6 avg

806.9 max
283.2 avg

181.7 avg

4.1
29.4580

29.7790

33.6

80.183
177.210

284.298

325.781

364.480

502.991

636.973

642.703

722.893

0.051
0.0060

0.0354

0.00472

0.001310

0.00248

0.0154

0.00244

0.0213
 

0.00620
 

0.0736
 

0.894
 

0.00420
 

1.00

0.0056
0.0137

0.0254

0.0090

0.0262
0.00265

0.0606

0.00251

0.812

0.00361

0.0727

0.00220

 0.0180

Cs-137
30.0 y
Beta -
Electron*
Electron*

Electron*

Electron*

Electron*

Beta 1
 

Beta 2
 

X Ray L*
X Ray Ka2*

X Ray Ka1*

X Ray Kß*

Gamma 1*

*From Daughter, Ba-137m

3.67
26.4

624.219

655.671

660.367

511.5 max
173.5 avg

1173.2 max
415.4 avg

4.47
31.8171

32.1936

36.4

661.0

 0.073
0.0077

0.0778

0.0142

0.00472

0.9443
 

0.0553
 

0.01
0.0199

0.0368

0.0134

0.0851

Ce-141
32.5 d
Beta -
Electron
Electron

Electron

Electron

Electron

Beta 1
 

Beta 2
 

Total Beta

X Ray L
X Ray Ka2

X Ray Ka1

X Ray Kß

Gamma

4
29.4

103.449

138.605

143.929

434.8 max
129.7 avg

580 max
180.7 avg

145.2 avg


35.55020

36.02630

40.7

145.440

0.158
0.015

0.182

0.0250

0.0068

0.696
 

0.0340
 

1.00

0.026
0.0474

0.087

0.0326

0.193 

Tl-204*
3.78 y
Beta -
and

Electron

Capture
Electron Auger-L
Electron Auger-K

Beta 1
 

X Ray L
X Ray K a2

X Ray Ka1

X Ray Kß

7.6
53.8

763.70 max
244.03 avg

9.990
68.8950

70.8190

80.30

0.0140
0.000575

0.9710
 

0.0086
0.00477

0.0081

0.00357

* Data obtained from the National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY 11973-5000.