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Soddy: central claims

Scope: two books by Frederick Soddy in the folder, "Matter and Energy" (1911) and "The Interpretation of Radium and the Structure of the Atom" (4th ed., 1920; 1922 reprint). Text is fully readable in both (OCR on 40 of 588 pages). Soddy is a co-originator of the disintegration theory and of the isotope concept, so his priority statements are his own characterisation (an interested party).

Source gap note (scope, not legibility): the folder does not contain Soddy's economics writing (monetary reform, "Cartesian Economics", "Wealth, Virtual Wealth and Debt") or his papers with Rutherford and Ramsay. Only the energy-and-wealth passages in these two books (Matter and Energy Ch. I and X; Interpretation Ch. X-XI, the gold-silver speculation and the Kitson footnote) touch those themes; the 1911 chapter contains the premises (coal as capital, gold as a "guinea stamp") but no monetary-reform content. Later steps should not treat his economic views as read from this folder. Coverage after QE: deep reads cover Interpretation PDF pp.49-57, 106-132, 141-146, 153-165, 169, 195, 207-221, 246-256 and 268-300, and Matter and Energy PDF pp.13-42, 101-118 and 201-257; other chapters (rays, X-rays, early emanation work, series tables, electron theory) rest on digests.

Edition note: the 1911 book gives uranium:radium 3,000,000, uranium life 7,500 million years and radium heat about 100 cal/h; the 1920 book gives 3,200,000, 8,000 million years and 133 cal/h. Records should name the edition.

Radioactivity is spontaneous transmutation of single atoms: each atom has a fixed chance per second of disintegrating, independent of its age or surroundings, so the rate is proportional to the amount present and the amount falls exponentially (average life = 1/lambda; half-change period 0.69 of it). Soddy also reports that radium decays no faster when concentrated than when diluted (Matter and Energy p.247, no data given) and treats decay as an "absolute standard of time". The strong form "independent of every other consideration" holds for alpha and most beta decay but not for electron capture and bound-state decay.
Radium's energy is internal atomic energy, not borrowed from outside: a gram of radium gives about 133 calories per hour in 1920 (about 100 in 1909-1911; no experimenter is named in either book), roughly 2.9 billion calories over the complete change of the radium atom and its quick products to polonium-214 (the later Pb-210, Bi-210, Po-210 tail adds about 23 per cent), consistent with conservation of energy because the radium atom itself changes. Soddy prints three bases for "how much more than chemistry": "nearly a million times" any change known previously (7.7e5 against hydrogen burning to water), "well over a million" times coal burned with its oxygen, and about 360,000 times coal alone. The rival "external energy" alternative is stated only in outline by Soddy, who admits it cannot be directly disproved and rejects it by the decay and recovery of the emanation. The 133 cal/h value lies inside the modern range of about 123-145 cal/h; the 1911 value was 25-30 per cent low. His further claim that uranium yields "some thirteen per cent" more energy than radium (a pound of oxide holding at least 160 tons of coal's energy) is not reproduced by his own chain (about 52 per cent more per gram by alpha count).
Radium survives only because it is continuously made: in radioactive equilibrium the amount of a product relative to its parent equals the ratio of their average lives (in numbers of atoms; the book's weight ratio 3,200,000 needs a 226/238 correction of about 5 per cent), which gives radium a mean life of about 2,500 years (modern 2,308, 8 per cent lower), uranium about 7,500 (1911) to 8,000 (1920) million years (modern 6,450, 16-24 per cent lower), and the chain uranium I, uranium X, uranium II, ionium, radium, emanation, with lead as the end product (eight alpha particles and six beta particles). Printed slips in the book: the "58 grams" of ionium per gram of radium against the book's own table (40), and "uranium I, with its period of 8,000,000 years" on PDF p.237 (page image; should be 8,000,000,000). Actinium is explained by Soddy as a branch of uranium: its alpha activity in minerals is only 1/15-1/16 of the uranium series where 5/8 would be expected, so about one uranium atom in twelve (about 8 per cent) goes via uranium Y and "eka-tantalum" to actinium (historically superseded: the actinium series comes from a separate isotope, U-235, discovered in 1935 [memory, high]).
The alpha particle is a helium atom (charge 2, mass 4); radium becomes its emanation (radon) by expelling one, and helium accumulates in uranium and thorium minerals as a product of decay. Soddy reports his own four-year experiment finding helium from uranium and thorium solutions at "about two milligrams of helium from a thousand tons of uranium per year", which he says matches the 8,000-million-year life; that agreement holds only for one alpha per uranium atom, whereas the same edition gives uranium I and II (two alphas), so the book leaves a factor-of-two inconsistency unreconciled (he himself says "of the same order"). Alpha particles from each emitter have a fixed range, and log period against log range gives three parallel lines, "the reason ... still obscure" (the Geiger-Nuttall rule, explained in 1928 by tunnelling [memory, high]); pleochroic halos in mica (Joly) are offered as evidence that alpha emission has been steady over hundreds of millions of years.
Atoms of one chemical element can differ in mass: after an alpha loss the product falls two places in the periodic table and after a beta loss rises one, so uranium and thorium series end in chemically identical lead of different weight (206.05 and 207.9 measured; ordinary lead is four isotopes, 204, 206, 207, 208, not a mixture of two), and Aston's 1920 mass spectra show many ordinary elements are isotope mixtures with near-whole-number masses (the "to one part in a thousand" integer rule was later superseded by Aston's own packing-fraction result). Soddy names these isotopes (the word was suggested to him by Margaret Todd, 1913 [web, see arbiter]) and credits the 1913 generalisation jointly to himself, A. S. Russell and K. Fajans; his 1922 Nobel lecture adds Hevesy and gives the order (Hevesy and Russell partly correct; Fajans complete and first; Soddy a fortnight later, independently). Both are Soddy's own accounts of a priority in which he has a stake. The 1920 book credits Fleck's three years of chemical work and van den Broek's suggestion on nuclear charge. A second priority statement: the parent of actinium was isolated in 1919 "by Cranston and the writer in this country" (eka-tantalum) and by Hahn and Meitner in Germany (proto-actinium), both groups credited. The figure 206.05 is not traced to a named experimenter; thorite lead 207.90 is Hoenigschmid's.
The atom has a tiny dense nucleus, and releasing nuclear energy is a real problem. Split: 6a. The nucleus has charge equal to the atomic number (Rutherford, Moseley). 6b. Alpha bombardment of nitrogen knocks out hydrogen (Rutherford 1919); Soddy's surmise of the product (carbon-12 plus two hydrogen) is wrong, the real reaction is 14N + alpha -> 17O + p (Blackett 1925). 6c. Rutherford's June 1920 report of a mass-3 doubly charged particle from nitrogen and oxygen, which Soddy reports (he is the reporter, not the claimant); it was not confirmed. 6d. Releasing nuclear energy by induced transmutation is real but unsolved; success would bring great energy and great danger; Soddy's estimate is that alpha particles need the equivalent of two to four million volts. In 1911 he says a pound of uranium evolves as much energy as a hundred tons or more of coal but gives out only about 1/10,000,000,000 of it per year, so control, not discovery, is the barrier. Also: Soddy's speculative proton radius of about 1e-16 cm is superseded by measurement (about 0.84e-13 cm).
Radioactivity changes the picture of the earth, sun and civilisation. Split: 7a. Radioactive heat in the earth (Strutt, Joly); the earth's interior "steadily getting hotter" and, in Joly's view, a world may eventually explode; alternating "geological" and "incandescent" ages (both books). Tait (1876, quoted) had capped the earth at 10-15 million years and the sun's chemical fuel at 5,000 years. 7b. The sun: 1911 "mainspring of the universe" (hedged: sun shrinkage of about 40 miles per thousand years judged insufficient); 1920 radium cannot supply the sun's heat but the source may be internal. The sun's power is hydrogen fusion [memory, high]. 7c. "Energy and wealth are synonymous"; civilisation lives on a diminishing capital of coal (Matter and Energy Ch. I, p.38 and p.41; Ch. X). A one-line assertion inside a physical-conditions argument, not a derivation; the folder holds no monetary writing. 7d. Gold and silver may belong to one slowly changing series, gold changing faster (self-contradictory under its own premise). 7e. The philosopher's stone and the Fall of Man may echo a forgotten race that mastered transmutation. 7f. Whether living things escape the second law: Soddy asks (Matter and Energy Ch. IV, pp.104-109, as an open question, "time alone and experiment will answer it decisively") whether "molecular intelligence" would vitiate the law and whether body cells can use the speed differences of molecules, and reports an unnamed "consensus of opinion" that life processes cannot obey it; he claims no measured violation. Related: Le Sage gravitation is "though not accepted, very suggestive" (pp.116-118).

Corrections to earlier documents (for the orchestrator) - digest/interpretationof00sodd-f5dd74.09.md p.273: "new kind of mass 8" is an OCR error; the page image reads mass 3 (deep read). Also p.274: the exponent of the 1,830-times-smaller radius is 10^-16 cm. - digest/interpretationof00sodd-f5dd74.10.md p.296: "320" and "750" in Aston's table are 32.0 and 75.0. - digest/interpretationof00sodd-f5dd74.07.md p.237: "uranium I (8,000,000 years, alpha)" conflicts with 8,000,000,000 years printed in the series figures and p.169 (digest 05); the book itself misprints 8,000,000 on PDF p.237 (page image confirmed); the intended value is 8,000 million years. - digest/interpretationof00sodd-f5dd74.07.md p.226: "Kelvin's assumption of two parts of radium per million million" is Joly's (the text says "He assumes"; Kelvin is cited only for the thermal insulation of the core). - Matter and Energy misprints the 1890s dates as "1905" four times (PDF p.128 twice for argon and the inert gases, p.165 for the overlooked X-rays, p.204 for Roentgen); the true dates are 1894-95; the 1920 book gives 1895 (its p.30). The error is in the book, not in our digests; do not repeat 1905. - facts.json (Matter and Energy): the earlier text "ionium unnamed ... named only as an 'intermediate substance'" was wrong. The 1911 text reads "an intermediate substance, ionium, which does produce radium steadily with the lapse of time ... The average life of ionium is probably at least a hundred times longer than that of radium" (PDF p.224). Corrected here: ionium is named, with no discoverer, no measured life and no growth result. - Records that state "nearly a million times" as a comparison with coal alone (physicist.md Claim 2a, mathematician.md Claim 2a and table 2b, contrarian.md section 2 item 7, section 5 item 6 and corrections item 7, deep/interpretationof00sodd-f5dd74.md section 3 table and closing list, primer.md step 6) should say: Soddy compares radium with "a similar weight of matter undergoing any change known previously" (PDF p.164); hydrogen and oxygen give 7.7e5, and he gives 360,000 for coal alone himself (p.219). The phrase is not generous. - Records that quote "thirteen per cent" as correct (arbiter.md C2 and C7, primer.md) should call it Soddy's unexplained estimate: his own Fig. 34 and table p.199 give eight alphas for uranium and five for radium, about 52 per cent more per gram; the 160 tons is consistent with 13 per cent and is correctly hedged as "at least". The carry-over from the 1909 text is an inference, not checked. - Records that present Soddy's helium measurement as an independent confirmation of the 8,000-million-year uranium life should add: it agrees only if one alpha per uranium atom is assumed; the 1920 text gives two (uranium I and II), which doubles the predicted rate or doubles the implied life (about 1.7e10 years); Soddy himself writes "of the same order" (p.145). The radium-ratio route to 8,000 million years is unaffected. - Uranium II is given as 3,000,000 years in the tables (PDF pp.199, 208) and "two million" in the text (pp.195, 211); the modern value is about 245,000 years (half-life). Cite both book values. - "Exact experiments have proved ... 133 calories per hour" (PDF p.52) names no experimenter: any attribution to Curie and Laborde or Rutherford and Barnes is [memory], not [read]. The 33 cal/h (radium) and 100 cal/h (emanation) split runs over PDF pp.125-126, not p.125 alone. - Records that say Soddy "endorses" Le Sage or "claims" living bodies violate the second law should use his words: Le Sage is "though not accepted ... very suggestive" and "on a par" with Newton's imagined cause; life and the second law are posed as an open question with an unnamed "consensus of opinion". - Records that state "uranium life 8,000 million years" or "uranium:radium 3,200,000" should say which edition: 1911 gives 3,000,000 and 7,500 million; 1920 gives 3,200,000 and 8,000 million. - The deep read on Matter and Energy infers that the 1911 book works with about 100 cal per hour per gram of radium (one hour from freezing to boiling; "a quarter of a ton of coal"), against 133 in 1920. The arbiter adds that the 1909 first edition prints 100 outright [web: https://archive.org/details/interpretationof00soddrich] and that the 38-hour sentence fits 100; treat the 1911 value as printed-evidence-based, not a bare guess. - Arbiter correction 8 applies to facts.json (Interpretation): the "58 g" and "lead an alpha and a beta gives gold" slips are printed errors in the book (recorded in the mainstream_conflict field). Arbiter correction 7: Chapter X is now read in full (deep read), no longer only pp.240-250. - Arbiter "123-147 cal/h" should read 123-145 (primer correction 1).