21. Radium has its origins as a decay product of certain isotopes of uranium and thorium. 22. The primary decay product before 106 Pd is rhodium and the primary product after is silver. 23. The lightest isotopes were synthesized by direct fusion between two lighter nuclei and as decay products . 24. Furthermore its decay product , helium-3, absorbs neutrons if exposed to the ones emitted by nuclear fission. 25. Radon is a decay product of radium which in turn is a decay product of uranium. 26. Over the long term, also forms in spent nuclear fuel as the decay product of americium-241. 27. All uraninite minerals contain a small amount of radium as a radioactive decay product of uranium. 28. The primary decay product before 102 Ru is technetium and the primary product after is rhodium. 29. Radon is a decay product of radium which in turn is a decay product of uranium. 30. Thus neptunium is present in nature in negligible amounts produced as intermediate decay products of other isotopes.
