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Radioactivity and Intensity

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If radioactivity is emitted with an intensity of 175mCi at a distance of 1.0m from the source, how far from the source should you stand in order to be exposed to no more than .2mCi?

I have absolutely know idea of where to even begin with this problem, nor how to set it up. Please give me DETAILED direction and any formula involved conversion factors. Please help?

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The intensity of emission from a radioactive substance is found to decrease ...

Solution Summary

This solution is provided in 60 words. It provides an equation related to radioactivity of a substance, and uses this equation to determine distance one should stand from the source.

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