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spuggie, A very rare element in nature, polonium is found in uranium ores at about 100 micrograms per metric ton (1:1010). Its natural abundance is approximately 0.2% of the abundance of radium.
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Without wanting to complicate matters to much, Marie Curie descovered Polonium, the element was named after the place of her birth Poland. It is used in the 'triggers' of nuclear devices, a highly toxic and dangerous substance that non but the irresponsible would even consider using outside of the laboratory.