Braun MCA166-USB Manuale Utente
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
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
964.11/1112.07/1408.
00
28.38/26.59/12.98/14.46/
13.57/20.85
13.57/20.85
Hg203
46.61d
279.19
81.84
Mn54
312.2d
834.82
99.98
Pb214
26.8min,
daughter of
Ra226
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
205.33
10.53/4.7/53.15/4.7
Y88
106.65
898.04
94
Pb fluorescence x-
rays
rays
-
74.96/72.79/84.99/
87.34
87.34
15