| 1. | Protactinium-233 is formed upon neutron capture by 232 Th.
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| 2. | As with oxides, protactinium forms mixed halides with alkali metals.
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| 3. | Thorium-233 decays into protactinium-233 through beta decay.
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| 4. | Protactinium-233 is also part of the thorium fuel cycle.
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| 5. | As actinium, the distribution of protactinium follows that of 235 U.
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| 6. | Protactinium in the body tends to accumulate in the kidneys and bones.
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| 7. | In all these materials, protactinium ions are octahedrally coordinated.
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| 8. | An alternative reaction is between protactinium pentachloride and hydrogen bromide or thionyl bromide.
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| 9. | Also a harder neutron spectrum helps to achieve acceptable breeding without protactinium isolation.
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| 10. | Protactinium forms mixed binary oxides with various metals.
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