Table 3.

Main energies of the gamma rays produced by the laboratory sources.

Source	Peak Energy [keV] Used for Calibration	Peak Energy [keV] Not Used for the Calibration Fit
60Co	1173, 1330
22Na	511, 1274	170 *
207Bi	75, 570, 1064
137Cs	662	184 *
241Am		59, 26
226Ra	295, 352, 609, 768, 1120, 1238, 1377, 1764	2204, 2248
133Ba		31, 35, 81, 356

* From Compton backscattering.