GBS Elektronik MCA166-USB - Manual (Page 15)

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
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