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  2. Uranium-233 - Wikipedia

    en.wikipedia.org/wiki/Uranium-233

    The production of "clean" 233 U, low in 232 U, requires a few factors: 1) obtaining a relatively pure 232 Th source, low in 230 Th (which also transmutes to 232 U), 2) moderating the incident neutrons to have an energy not higher that 6 MeV (too-high energy neutrons cause the 232 Th (n,2n) → 231 Th reaction) and 3) removing the thorium sample ...

  3. Isotopes of neptunium - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_neptunium

    Alpha emission: the decay energy is 5.2 MeV and the decay product is protactinium-231. Electron capture : the decay energy is 0.125 MeV and the decay product is uranium-235 This isotope of neptunium has a weight of 235.044 063 3 u.

  4. Isotopes of protactinium - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_protactinium

    The most stable isotope is 231 Pa with a half-life of 32,760 years, 233 Pa with a half-life of 26.967 days, and 230 Pa with a half-life of 17.4 days. All of the remaining radioactive isotopes have half-lives less than 1.6 days, and the majority of these have half-lives less than 1.8 seconds.

  5. Thorium - Wikipedia

    en.wikipedia.org/wiki/Thorium

    Two radiometric dating methods involve thorium isotopes: uranium–thorium dating, based on the decay of 234 U to 230 Th, and ionium–thorium dating, which measures the ratio of 232 Th to 230 Th. [e] These rely on the fact that 232 Th is a primordial radioisotope, but 230 Th only occurs as an intermediate decay product in the decay chain of ...

  6. Protactinium - Wikipedia

    en.wikipedia.org/wiki/Protactinium

    Protactinium-231 arises naturally from the decay of natural uranium-235, and artificially in nuclear reactors by the reaction 232 Th + n → 231 Th + 2n and the subsequent beta decay of 231 Th. It was once thought to be able to support a nuclear chain reaction, which could in principle be used to build nuclear weapons ; the physicist Walter ...

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  8. Cuba runs short on fuel at pump as energy crisis festers - AOL

    www.aol.com/news/cuba-runs-short-fuel-pump...

    HAVANA (Reuters) - Cubans still reeling from months of hours-long blackouts now have a new problem on their hands: fuel shortages. Many gas stations across the island have been shuttered for days ...

  9. Molar mass - Wikipedia

    en.wikipedia.org/wiki/Molar_mass

    In chemistry, the molar mass (M) (sometimes called molecular weight or formula weight, but see related quantities for usage) of a chemical compound is defined as the ratio between the mass and the amount of substance (measured in moles) of any sample of the compound. [1] The molar mass is a bulk, not molecular, property of a substance.

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    chem 231 uvic formula worksheet excel sample questions and answers mlo pdf