MeV                Source                    Half-life

        1.83                Nd-144                2.1 X 10¹⁵ years
        2.14                Gd-152                1.1 X 10¹⁴ years
        2.23                Sm-147                1.06 X 10¹¹ years
        2.46                Sm-146                1.03 X 10⁸ years
        2.50                Hf-174                 2.0 X 10¹⁵ years
        2.73                Gd-150                1.78 X 10⁶ years
        3.18                Gd-148                97.5 years
        3.18                Pt-190                 6.9 X 10¹¹ years
        3.957              Th-232                1.41 X 10¹⁰ years
        4.016              Th-232                1.41 X 10¹⁰ years
        4.15                U-238                  4.47 X 10⁹ years
        4.196              U-238                  4.47 X 10⁹ years
        4.367              U-235                  7.04 X 10⁸ years
        4.397              U-235                  7.04 X 10⁸ years
        4.416              U-235                  7.04 X 10⁸ years
        4.445              U-236                  2 X 10¹⁶ years
        4.494              U-236                  2 X 10¹⁶ years
        4.557              U-235                  7.04 X 10⁸ years
        4.568              Bi-210m              3 X 10⁶ years
        4.598              U-235                  7.04 X 10⁸ years
        4.602              Ra-226                1,599 years
        4.621              Th-230                8 X 10⁴ years
        4.688              Th-230                8 X 10⁴ years
        4.723              U-234                  2.45 X 10⁵ years
        4.737              Pa-231                3.28 X 10⁴ years
        4.765              Np-237               2.14 X 10⁶ years
        4.770              Np-237               2.14 X 10⁶ years
        4.774              U-234                 2.45 X 10⁵ years
        4.783              U-233                 1.59 X 10⁵ years
        4.785              Ra-226               1,599 years
        4.787              Np-237               2.14 X 10⁶ years
        4.811              Th-229               7,340 years
        4.824              U-233                 1.59 X 10⁵ years
        4.845              Th-229                7,340 years
        4.856              Pu-242                3.76 X 10⁵ years
        4.896              Pu-241                14.36 years
        4.901              Th-229                7,340 years
        4.901              Pu-242                3.76 X 10⁵ years
        4.91                Bi-210m              3 X 10⁶ years
        4.95                Ac-227                21.8 years
        4.951              Pa-231                3.28 X 10⁴ years
        4.946              Bi-210m              3 X 10⁶ years
        4.967              Th-229                7,340 years
        5.012              Pa-231                3.28 X 10⁴ years
        5.053              Th-229                7,340 years
        5.058              Pa-231                3.28 X 10⁴ years
        5.105              Pu-239                5.5 X 10¹⁵ years
        5.123              Pu-240                6,580 years
        5.143              Pu-239                5.5 X 10¹⁵ years
        5.155              Pu-239                5.5 X 10¹⁵ years
        5.159              Pu-240                6,580 years
        5.234              Am-243               7,370 years
        5.264              U-232                 72 years
        5.276              Am-243               7,370 years
        5.305              Po-210                138.4 days
        5.307              Cm-245               8,537 years
        5.321              U-232                  72 years
        5.343              Cm-246               4,713 years
        5.343              Th-228                1.91 years
        5.360              Cm-245               8,537 years
        5.386              Cm-246               4,713 years
        5.42                Bk-249                325 days
        5.423              Th-228                1.91 years
        5.443              Am-241               432 years
        5.447              Ra-224                3.67 days
        5.448              Bi-214                19.7 minutes
        5.454              Pu-238                87.74 years
        5.486              Am-241               432 years
        5.490              Rn-222                3.824 days
        5.499              Pu-238                87.74 years
        5.512              Bi-214                19.7 minutes
        5.53                Bk-247               1,380 years
        5.540              Ra-223               11.43 days
        5.608              Ra-223               11.43 days
        5.677              Cf-251                900 years
        5.688              Bk-247               1,380 years
        5.686              Ra-224               3.67 days
        5.709              Th-227                18.7 days
        5.717              Ra-223               11.43 days
        5.732              Ac-225               10.0 days
        5.741              Cm-243               28.5 years
        5.748              Ra-223               11.43 days
        5.757              Th-227               18.7 days
        5.764              Cm-244              18.1 years
        5.785              Cm-243              28.5 years
        5.794              Ac-225               10.0 days
        5.806              Cm-244              18.1 years
        5.812              Cf-249                351 years
        5.818              U-230                 20.8 days
        5.830              Ac-225               10.0 days
        5.852              Cf-251                900 years
        5.868              At-211                7.21 hours
        5.87                Bi-213                47 minutes
        5.889              U-230                 20.8 days
        5.978              Th-227               18.7 days
        5.989              Cf-250                13 years
        5.992              Cm-243              28.5 years
        6.002              Po-218                3.05 minutes
        6.031              Cf-250                13 years
        6.038              Th-227                18.7 days
        6.051              Bi-212                60.6 minutes
        6.056              Cm-243               28.5 years
        6.069              Cm-242               163 days
        6.076              Cf-252                2.65 years
        6.090              Bi-212                60.6 minutes
        6.113              Cm-242               163 days
        6.118              Cf-252                2.65 years
        6.126              Fr-221                4.8 minutes
        6.225              Th-226               30.9 minutes
        6.278              Bi-211                2.15 minutes
        6.28                At-219                0.9 minutes
        6.288              Rn-220               56 seconds
        6.34                Th-226                30.9 minutes
        6.340              Fr-221                4.8 minutes
        6.424              Rn-219               4.0 seconds
        6.439              Es-254                276 days
        6.551              Rn-219                4.0 seconds
        6.56                Ra-222                38 seconds
        6.622              Bi-211                2.15 minutes
        6.63                Es-253                20.47 days
        6.65                At-218                2 seconds
        6.70                At-218                2 seconds
        6.777              Po-216                0.15 seconds
        6.818              Rn-219               4.0 seconds
        7.022              Fm-255               20.1 hours
        7.07                At-217                32 milliseconds
        7.14                Rn-218               35 milliseconds
        7.145              Fm-254               3.24 hours
        7.200              Fm-254               3.24 hours
        7.28                Po-211m             25 seconds
        7.384              Po-215                1.78 milliseconds
        7.448              Po-211                0.52 seconds
        7.687              Po-214                164 microseconds
        8.377              Po-213                4.2 microseconds
        8.785              Po-212                0.30 microseconds
        8.88                Po-211m             25 seconds
        11.65              Po-212m             45 seconds