Table A-6

RECOMMENDED GAMMA-RAY STANDARDS

Nuclide

Half-life

Photon Energy (KeV)

Emission Probability (γ/d)

Na-22

2.605 y

1274.54

1.0

Mn-54

312.2 d

834.84

1.0

Co-57

271.8 d

122.06

0.859

Co-60

5.27 y

1173.24

0.999

 

 

1332.50

1.0

Zn-65

243.8 d

1115.55

0.507

Kr-85

10.73 y

514.01

0.00434

Sr-85

64.84 d

514.01

0.983

Y-88

106.6 d

898.04

0.937

 

 

1836.06

0.9924

Cd-109

462.0 d

88.03

0.0375

Sn-113

115.1 d

391.7

0.6489

Sb-125

2.758 y

27.4

0.619

 

 

176.4

0.06979

 

 

380.5

0.0151

 

 

427.9

0.294

 

 

463.4

0.1037

 

 

600.6

0.1735

 

 

635.9

0.112

Cs-137

30.17 y

661.66

0.852

Ba-133

10.53 y

81.0

0.343

 

 

302.85

0.183

 

 

356.02

0.621

Ce-139

137.6 d

165.9

0.80

Eu-152

13.48 y

121.78

0.2837

 

 

244.7

0.0751

 

 

344.38

0.2658

 

 

443.98

0.0312

 

 

778.9

0.1296

 

 

964.13

0.1462

 

 

1085.91

0.1016

 

 

1112.12

0.1356

 

 

1408.01

0.2085



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