International
Tables for
Crystallography
Volume C
Mathematical, physical and chemical tables
Edited by E. Prince

© International Union of Crystallography 2006
International Tables for Crystallography (2006). Vol. C. ch. 4.2, p. 196

Table 4.2.1.5 

U. W. Arndta‡

Table 4.2.1.5 | top | pdf |
Radionuclides decaying wholly by electron capture, and yielding little or no γ-radiation

Nuclide Half-life X-rays Remarks
Element [K{\alpha_1}] (keV)
37Ar 35 d Cl 2.622 –
51Cr 27.8 d V 4.952 γ at 320 keV
55Fe 2.6 a Mn 5.898 –
71Ge 11.4 d Ga 9.251 –
103Pd 17 d Rh 20.214 Several γ's; all weak
109Cd 453 d Ag 22.16 γ at 88 keV
125I 60 d Te 27.47 γ at 35.4 keV
131Cs 10 d Xe 29.80 –
145Pm 17.7 a Nd 37.36 γ's at 67 and 72 keV
145Sm 340 d Pm 38.65 γ's at 61 keV; weak γ at 485 keV
179Ta 600 d Hf 55.76 –
181W 140 d Ta 57.52 γ at 6.5 keV; weak γ's at 136, 153 keV
205Pb 5 × 107 a Tl L only (Lα1 = 10.27 keV) –