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Physics · Oct / Nov 2025 · Paper 12 · Question 37

5054Radioactive decay

Which nuclide is produced when thorium-223, $^{223}_{90}$Th, emits an alpha-particle?

  1. A$^{219}_{88}$Ra
  2. B$^{219}_{92}$U
  3. C$^{227}_{88}$Ra
  4. D$^{227}_{92}$U

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Correct answer: A. $^{219}_{88}$Ra

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