| E(keV) | Intensity | Nuclide |
|---|---|---|
| 490.0( 2) | 7.976e-02 | Cs-136 (B- 13.16 D) |
| 490.34( 6) | 0.16 | Eu-156 (B- 15.19 D) |
| 490.34(20) | 2.405e-04 | Te-129m (B- 33.6 D) |
| 490.4( 2) | 72. | Cm-248 (SF 3.48E+5 Y) |
| 490.422(16) | 0.414 | Tm-172 (B- 63.6 H) |
| 490.437(14) | 1.959 | Lu-172 (EC 6.70 D) |
| 490.53(15) | 1.092e-03 | Mo-99 (B- 65.94 H) |
| 490.6( 2) | 6.555 | Cm-248 (SF 3.48E+5 Y) |
| 490.76( 7) | 0.761 | Ir-190 (EC 11.78 D) |
| 490.8( 5) | 1.3 | Pu-242 (SF 3.733E+5 Y) |
| 491.243(11) | 2.848 | I-126 (B- 13.11 D) |
| 491.29(14) | 4.768e-03 | Sb-125 (B- 2.75856 Y) |
| 491.5( 1) | 3.098e-02 | Ta-177 (EC 56.56 H) |
| 492.3( 5) | 6.000e-03 | Np-239 (B- 2.3565 D) |
| 492.351( 4) | 8.03 | Cd-115 (B- 53.46 H) |
| 492.351( 5) | 9.600e-03 | Cd-115m (B- 44.6 D) |
| 492.55( 7) | 3.281e-03 | Sm-145 (EC 340 D) |
| 492.9 | 5.935 | Cf-252 (SF 2.645 Y) |
| 493.1( 2) | 9.198 | Cm-248 (SF 3.48E+5 Y) |
| 493.43( 9) | 1.034e-02 | Ag-110m (B- 249.79 D) |
| 493.5 | 0.125 | Cm-248 (SF 3.48E+5 Y) |
| 493.508(20) | 2.950e-02 | Eu-152 (EC 13.537 Y) |
| 493.508(20) | 9.812e-03 | Eu-152 (B- 13.537 Y) |
| 493.6( 2) | 0.594 | Cm-248 (SF 3.48E+5 Y) |
| 493.65( 5) | 0.379 | Bi-205 (EC 15.31 D) |