| 41. | They discovered significant neutron multiplication in natural uranium, proving that a chain reaction might be possible.
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| 42. | The pile would use natural uranium as fuel.
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| 43. | Producing a fission chain reaction in natural uranium fuel was found to be far from trivial.
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| 44. | Pressurized heavy water reactors ( PHWR ) running on natural uranium have a conversion ratio of 0.8.
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| 45. | These reactors use natural uranium, rather than the enriched form, which is hard to make and costly.
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| 46. | What is left over is pure depleted uranium-238, which is about half as radioactive as natural uranium.
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| 47. | It also has about 1 . 5 tons of natural uranium ore, which has not been enriched.
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| 48. | The fission reactions of the natural uranium tamper were quite dirty, producing a large amount of fallout.
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| 49. | Natural uranium is made up of a mix of isotopes, or different forms of the same element.
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| 50. | Natural uranium is about 0.7 percent uranium-235.
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