| (1896-1903) | |
| Discoveries of Radioactive Substances | p. 1 |
| Rontgen's discovery | p. 1 |
| Becquerel's early work | p. 2 |
| Discovery of thorium radiation | p. 4 |
| Discovery of polonium | p. 6 |
| Discovery of radium | p. 8 |
| Discovery of actinium | p. 10 |
| Radioactive lead | p. 11 |
| Uranium X | p. 12 |
| References | p. 13 |
| Emanation and Radioactive Deposit | p. 16 |
| Induced radioactivity | p. 16 |
| Emanation | p. 19 |
| Thorium X | p. 23 |
| Radioactive deposit | p. 24 |
| References | p. 27 |
| Radioactive Radiations | |
| Early investigations of radiations | p. 28 |
| Beta-rays | p. 33 |
| Alpha-rays | p. 35 |
| Gamma-rays | p. 42 |
| Heat generation | p. 43 |
| References | p. 44 |
| First Interpretations | p. 46 |
| Energy sources | p. 46 |
| Emanation model of radioactivity | p. 46 |
| Becquerel's model of radioactivity | p. 52 |
| Rutherford - Soddy's model of radioactivity | p. 52 |
| Causes of disintegrations | p. 59 |
| References | p. 60 |
| (1904-1914) | |
| First Nuclear Instruments and Methods | p. 62 |
| Counting the [alpha]-particles | p. 62 |
| Cloud chamber | p. 65 |
| Beta-ray spectrographs | p. 70 |
| Radioactive recoil | p. 73 |
| Statistics | p. 74 |
| References | p. 75 |
| Clarification of Alpha-Particle Properties | p. 77 |
| Bragg introduces the concept of range | p. 77 |
| Properties of alpha-particles | p. 80 |
| Penetration of alpha particles | p. 84 |
| Geiger-Nuttal rule | p. 88 |
| References | p. 90 |
| Origin of Beta- and Gamma-Rays | p. 92 |
| Absorption of beta-rays | p. 92 |
| Beta-ray spectra | p. 98 |
| Gamma-rays | p. 103 |
| References | p. 107 |
| Radioactive Series and Isotopes | p. 109 |
| First examples of chemical non-separability | p. 109 |
| Isotopes of the uranium series | p. 114 |
| First generalization | p. 118 |
| Intra-atomic or nuclear charge | p. 119 |
| The making of the displacement law | p. 121 |
| Impact and clarifications | p. 123 |
| References | p. 128 |
| Atoms and X-Rays (1900-1925) | |
| Atoms Before Quantum Mechanics | p. 131 |
| Models before Bohr | p. 131 |
| Bohr's model | p. 134 |
| Sommerfeld's contribution | p. 144 |
| X-rays spectra | p. 145 |
| Shell structure | p. 148 |
| References | p. 153 |
| Post-War Progress (1919-1931) | |
| Artificial Transmutations | p. 155 |
| Ramsay's "transmutations" | p. 155 |
| Rutherford's initial papers | p. 157 |
| Rutherford and Chadwick's papers | p. 164 |
| Cloud chamber evidence | p. 168 |
| Vienna investigations | p. 169 |
| Transmutation parameters | p. 173 |
| References | p. 174 |
| Mass Spectrometry and Isotopes | p. 177 |
| Early mass spectrometers | p. 177 |
| Discovery of isotopes | p. 181 |
| Whole number rule | p. 186 |
| Packing fraction | p. 186 |
| Abundances | p. 187 |
| Appendix: Basic properties of mass spectrometers | p. 187 |
| References | p. 190 |
| Interpretation of Beta, Gamma and Alpha Spectra | p. 192 |
| Breakthroughs in 1913/14 | p. 192 |
| External photo conversion | p. 194 |
| Crystal diffraction | p. 195 |
| Origin of gamma-rays | p. 196 |
| Nuclear decay schemes | p. 197 |
| Beta decay | p. 198 |
| Long range alpha particles | p. 199 |
| Fine structure of alpha-ray spectra | p. 203 |
| Gamow's letter to "Nature" | p. 204 |
| References | p. 207 |
| Index of Names | p. 209 |
| Subject Index | p. 215 |
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