any conversion from mCi to SV and vise versa?
You mean, for internal contamination ?
1 mCi = 37e6 Bq and then you need to use the radiotoxicity of the isotope in question to convert this in an engaged dose. The radiotoxicity is the amount of Sv per Bq, and varies for actinides from something like 1e-8 to 1e-12 or so for weak beta emitters.
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