5 some of the most important photon energies – GBS Elektronik MCA166-USB User Manual

Page 15

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5 Some of the most important photon energies

Table 3: Photon energies for different isotopes

Isotope

Half-life

Energy (keV)

Branching ratio (%)

Am241

432.2y

26.34/59.54

2.4/36

Cd109

462.6d

88.03

3.63

Bi214

19.9min,
daughter of
Ra226

609.31

46.09

Ce139

137.64d

165.86

79.87

Co60

5.271y

1173.23/1332.49

99.85/99.98

Co57

271.8d

14.4/122.06/136.47

9.16/85.6/10.68

Cs137

30.07y

661.66

85.1

Eu152

13.3.y

121.77/344.28/778.91/
964.11/1112.07/1408.
00

28.38/26.59/12.98/14.46/
13.57/20.85

Hg203

46.61d

279.19

81.84

Mn54

312.2d

834.82

99.98

Pb214

26.8min,
daughter of
Ra226

241.91/295.09/351.86 7.46/19.17/37.06

Ra226

1600y

186.11

3.28

Sn113

115.09d

391.7

64.89

Sr85

64.84d

514.0

98.4

U235

7.04E8y

143.78/163.37/185.73/
205.33

10.53/4.7/53.15/4.7

Y88

106.65

898.04

94

Pb fluorescence x-
rays

-

74.96/72.79/84.99/
87.34

15

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