Nuclear Spectroscopy

Atomic K α1 Energy K α2 Energy K-Shell Absorption
Number (Z) Element (keV) (keV) Energy (keV)
73 Tantalum, Ta 57.5 56.3 67.4
74 Tungsten, W 59.3 58.0 69.5
75 Rhenium, Re 61.1 59.7 71.7
76 Osmium, Os 63.0 61.5 73.9
77 Iridium, Ir 64.9 63.3 76.1
78 Platinum, Pt 66.8 65.1 78.4
79 Gold, Au 68.8 67.0 80.7
80 Mercury, Hg 70.8 68.9 83.1
81 Thallium, Tl 72.9 70.8 85.5
82 Lead, Pb 75.0 72.8 88.0
83 Bismuth, Bi 77.1 74.8 90.5
84 Polonium, Po 79.3 76.9 93.1
85 Astatine, At 81.5 79.0 95.7
86 Radon, Rn 83.8 81.1 98.4
87 Francium, Fr 86.1 83.2 101.1
88 Radium, Ra 88.5 85.4 103.9
89 Actinium, Ac 90.9 87.7 106.8
90 Thorium, Th 93.4 90.0 109.6
91 Protactinium, Pa 95.9 92.3 112.6
92 Uranium, U 98.4 94.7 115.6
93 Neptunium, Np 101.1 97.1 118.7
94 Plutonium, Pu 103.8 99.6 121.8
95 Americium, Am 106.5 102.1 125.0
96 Curium, Cm 109.3 104.4 128.2
97 Berkelium, Bk 112.1 107.2 131.6
98 Californium, Cf 116.0 110.7 136.0
99 Einsteinium, Es 119.1 113.5 139.5
100 Fermium, Fm 122.2 116.3 143.1
101 Mendelevium, Md 125.4 119.2 146.8
102 Nobelium, No 128.7 122.1 150.5
103 Lawrencium, Lw 132.0 125.1 154.4
104 Rutherfordium, Rf
105 Hahnium, Ha
106 *Seaborgium, Sg
107 *Bohrium, Bh
108 *Hassium, Hs
109 *Meitnerium, Mt
110 **
111 **
112 **
* Proposed
**Observed at GSI, Darmstadt, but no name proposed as of 1996
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