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Rutherford-Ernest: central claims (Step 1b)

Sources: seven documents in the project folder, all text-extractable (three of the four books are fully OCR'd, so equations and many numbers are garbled in the text layer; the deep reads corrected them from page images). No Source gap for the main works. Items rest on [memory] only where tagged.

Reading limits the later steps should know about (updated after QE, 2026-10-09): - The digests were read as condensed page lines (not every full line). Deep reads now cover: the 1911 paper (all), the two Harper's articles (all), 1904 book Ch. V-VII and Ch. X sec. 199-207, 1906 book Ch. III-V and XI, 1913 book Ch. IV (alpha rays, re-run), Ch. XI-XIII, Ch. XIV sec. 200-202 and Ch. VII sec. 115-116 (text layer only, no page images), Ch. XVII sec. 233-240 and Ch. XVIII-XIX plus appendices, 1930 book Ch. VIII-XI, XIII sec. 88-94, and the halo and residual-activity pages (PDF pp.204-211, 574-581). - Still digest only, so a verdict resting on them rests on the digest: 1904 book Ch. I-IV, VIII-IX and XI; 1906 book Ch. I-II, VI-X; 1913 book Ch. I-III, V-X, XV-XVI and the rest of XIV; 1930 book Ch. I-VII, XII, XIV-XVII and the remainder of XVIII. These are measurement methods, spectra and chain details that no central claim turns on. - The 1913 deep-read file once lost its alpha-ray section (pp.131-192) when two agents wrote to it; it was re-run on 2026-10-09 and is now present. Page offsets differ by range (printed = PDF minus 17 in 1913 Ch. IV, about 23 in Ch. XIV, 25 in Ch. XVII-XIX); the deep files say which applies. - The author of every document is an interested party in his own theory (the disintegration theory, the nuclear atom). The 1930 book's Chapter VIII reports Chadwick's own experiments with Chadwick as co-author, and its Chapters IX-XI report Cambridge work by its own authors; the Vienna side of the artificial-disintegration dispute is described only by the Cambridge authors and no Vienna numbers are in the project.

Central claims

  1. Radioactive atoms spontaneously disintegrate into atoms of other substances, at a rate that no known physical or chemical agent changes and that follows a probability (exponential) law; thorium X, uranium X and the radium emanation chain are the experimental demonstrations (Rutherford and Soddy, 1902-1906).
  2. The energy released (about 100 calories per hour per gram of radium, about three-quarters of it from the emanation and its products, a store of about 3.7 x 10^9 calories per gram) is the atom's own internal energy, vastly larger than any chemical reaction, and not taken from the surrounding medium. (Provenance: the 1913 book derives 2.44 x 10^9 cal per gram of emanation in full and reproduces exactly; the 3.7 x 10^9 for radium with products through F is stated by a rule of thumb, not derived step by step. The 1904 first edition gives 2 x 10^9 to 5 x 10^10 cal per gram of radium. The heat was found 'about the same' in liquid carbon dioxide, oxygen and hydrogen by P. Curie and Dewar, 1904.)
  3. Alpha particles are helium atoms projected at about a tenth of the speed of light, beta rays are fast electrons and gamma rays penetrating radiation; helium and lead are final products, and uranium leads through ionium to radium (radium is 3.4e-7 of uranium by weight in old minerals). (Primary text in the project: the 1913 book Ch. IV, deep read, gives the alpha charge 9.3e-10 esu = 2e, 3.4e10 alpha per second per gram of radium, and the Rutherford-Royds helium experiment of 1909.)
  4. The atom has a small, massive, highly charged centre, a "central charge" later called the nucleus (1911): large-angle alpha scattering follows the cosec^4(phi/2) law, the central charge of gold is about 100 e in 1911 and equals the atomic number (79) by Chadwick's 1920 measurements, and Coulomb's law holds to about 3e-12 cm.
  5. Radioactive heat can account for the earth's internal heat, so Kelvin's cooling-earth limit on the age of the earth does not apply, and (speculatively) a similar release of atomic energy in ordinary matter at high temperature could lengthen the sun's life about a hundredfold (the 1904 book: 50 to 500 times, conditional and without a derivation; its '2.5 parts per million' of radium in the sun is W. E. Wilson's 1903 figure computed with Langley's solar constant, which is 1.53 times the modern value).
  6. The nucleus can be disintegrated artificially by alpha-particle bombardment (Rutherford 1919, nitrogen to protons; by 1924 every light element from boron to potassium except carbon and oxygen, always with one proton emitted, about 1 to 20 disintegrations per million alphas), and alpha-particle scattering from hydrogen, helium, aluminium and magnesium departs from the Coulomb law at close approach (hydrogen 100 times the Coulomb count, helium about 20 times, aluminium a deficit then a rise; Coulomb holds to about 4e-13, 3.5e-13 and 13e-13 cm). (Supported by the 1930 book Ch. IX-X, now deep read. The Vienna workers Kirsch and Pettersson reported far more frequent disintegration of nearly every element; the Cambridge authors give no explanation and no Vienna numbers.)
  7. Ordinary matter may itself be slowly transforming, and Rutherford held open, in the 1904 first edition of Radio-Activity (sec. 206, book p.339) and again in 1906, that disintegration might be triggered by an unknown external force like a detonator while the energy remains the atom's own; in 1904 he also wrote that gravitation "which is not under our control may influence in some way the stability of the radio-atoms". By 1930 no change in decay rate had been achieved by 3000 C, 20,000 atmospheres, electric, magnetic or gravitational fields, or intense radiation (the 1930 sentence gives no reference for any of these, gravity included; the radiation tests are named and all null: radon to 0.05 percent, alpha rays on uranium 1 in 5 million, on thorium 1 in 8 million, gamma rays on uranium 15 in 10^10 quanta). A weak alpha activity in platinum and brass (Hoffmann) and a zinc residue (Ziegert) were left unexplained.
  • Transmutation by ordinary means was claimed and rejected: Ramsay and Cameron 1907-08 (neon, argon from water; lithium from copper), Miethe 1924-25 and Nagaoka 1925 (gold), Smits 1926, Wendt and Irion 1922, Riding and Baly 1925, Paneth and Peters 1926 (helium from hydrogen in palladium); two were withdrawn by their authors, one failed a careful repetition, and the 1930 book calls the atomic-weight test of Miethe's gold "not conclusive". Each claimant's description and the refutation are in facts.json.
  • The beta-decay energy problem (1930 book sec. 93): calorimetry gave 350,000 +/- 40,000 volts per radium E disintegration, equal to the mean of the continuous beta spectrum and not its 1,050,000-volt upper limit, so energy per disintegration varies within wide limits; the book offers no interpretation. Pauli's neutrino (1930) resolved it [memory, high].
  • Temperature, pressure and explosion tests of decay rates before 1913 (Bronson, Russell, Rutherford and Petavel, Schuster, Eve and Adams), with Russell's explanation of the conflicting beta-ray results.
  • The uranium-radius paradox (scattering: radius under 4e-12 cm; alpha emission energy: at least 6.3e-12 cm) and its wave-mechanical resolution (Gamow; Gurney and Condon, 1928).
  • Pleochroic haloes as a geological-time record of alpha ranges, with the unexplained X and Z haloes.
  • A heat anomaly in the 1913 book: pitchblende (Poole 1910) gave about 1.8 times the heat calculated from its alpha energies, and the thorium mineral orangite far more; Rutherford suggests unsuspected chemical change.

Corrections to earlier documents

  • digest/structureatom-c98fd9.01.md (p.4 energy equation), p.6 prediction (3), p.10, p.11, p.14, p.15 entries: see the correction list at the end of deep/structureatom-c98fd9.md (sign of the NeE/SA term should be +; the scattered count goes as (Ne)^2; a silver row and three z/A^1.5 quotients in the printed tables do not follow from the printed numbers; p1 at p2 = 0.1 should be about 0.0007).
  • digest/Radioactive-Transformations-07f22e (p.104 and p.85 and Ch. IV pp.115, 124): OCR digit errors, "8800 gram calories" should be 3300 (9900 with products), "1/182" should be 1/132, "8.77 days" should be 3.77, and "85 minutes" should be 35 minutes. Any later document that quotes these must use the corrected values.
  • digest/Radioactive-Substances-and-Their-Radiati-f227f1 (p.158): "136 x 10^10 helium atoms per second" is an OCR slip for 13.6 x 10^10 (as recorded in the deep-read integrity note); "p.157 e/m 5070" and exponents on pp.145-158 are garbled and should be checked against page images before use.
  • The 1930 book prints "Phil. Mag. 21, 669, 1921" for Rutherford's nuclear-atom paper; the year is 1911 (a misprint in the book, not in the project).
  • The 1906 book leaves radium B described as rayless and A and B as possibly independent; its own footnote (Schmidt, 1905) withdraws both. The 1913 book treats A to B to C as successive and B as a beta emitter.
  • Added after QE (2026-10-09), from the new deep reads and qe.md:
  • sites.md lead 1, arbiter items 11 and 7e, primer Section 4 and Section 7, and the earlier claim 7 text said Rutherford first named gravity in the 2nd edition (1905). The sentence is in the project's own 1904 first edition, sec. 206, book p.339 (PDF p.357) [read: deep/radio-activity-e1fda6.md].
  • "Six elements" disintegrated at Cambridge (earlier facts.json, mathematician.md, arbiter, primer) is only the first method; with the right-angle method it is every light element up to potassium except hydrogen, helium, lithium, beryllium, carbon and oxygen [read: 1930 book PDF p.316, p.321].
  • The Dewar liquid-hydrogen heat measurement was made (P. Curie and Dewar 1904; repeated in the 1906 and 1913 books); it found no change. The earlier "never repeated" reading is withdrawn. It was a 10-day-old sample, from the same laboratory, with no tolerance stated.
  • The 3.7 x 10^9 cal figure: only the 2.44 x 10^9 cal per gram of emanation is derived in the book (1913 sec. 238); qe.md C3 says the book derives the 3.7 x 10^9, but the deep read finds it is stated by rule of thumb ("about one quarter ... 6 x 10^8" per average gram, then "about 3.7 x 10^9" for radium through F). The earlier "not derivable" is also too strong: a reconstruction (five alpha particles against three) gives 3.6 x 10^9, within 2-3 percent.
  • Alpha = helium: the project does hold primary text (1913 book Ch. IV, deep read, and 1930 book PDF p.64, digest), not digest-level only.
  • Bumstead (1906) measured the absorbed fractions with the radiometer: zinc 88 percent, lead 91 percent, against the electroscope's 78 and 79 percent, so the factor-two heating excess was not an electroscope-calibration artefact as far as he could test.
  • Errors in the 1930 book itself (not in the project): uranium closest approach 38.0 should be about 35e-13 cm; Blackett's "19 percent" average loss is 16 percent from the six printed ratios; the Danysz-Wertenstein year 1925 is probably 1915 (not web-checked); the printed 20 MeV barrier height does not follow from the book's table (about 33 MeV).
  • Text-layer slips in the 1913 heat pages: "15 C" is 1.5 C; "32 per cent / 47 per cent" are 3.2 / 4.7; "18 x 10^14" is 13 x 10^14. The printed 158 cubic mm of helium per year recomputes to 154; the book's 99.5 against a table sum of 98.5 cal/h per curie of emanation chain is a 1 percent inconsistency. The 1904 book prints 876,000 and 864,000 cal per year for the same quantity.