One mg of Po 210 is said to be liked 5 gr of Ra.. here the three orders of magnitude.

So if this ratio is correct I guess  there is some problem with the way the energy reaches to the tissue or I had a missmatch of three orders of magnitude.

I would bet that the ratio between Bq and actual energy in the tissue is not the given in the wiki article.

I will need some proof about this ratio.

Another option is to mix the amount of polonium in another substance so that alltogether is easy to handle.. but this would require some studd that you can not have at home..

A pleasure

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Check the PDF source. It is indeed 1.66e^14 Bq/g and 5.14e-7 Sv/Bq (ingested) or 2.54e-6 Sv/Bq (inhaled). So maybe the comparison with Radium is wrong. Also, the alpha particles emitted by radium might be much less energetic than those of Polonium. Radium 226 has a half-life of 1602y, so its alpha emission must also be much less energetic than that of Po210. I would expect thee kinetic energy of the alpha particle to be inversely proportional to the half-life. You get a factor of 4000 that way. Am I wrong?

Those whom the Gods wish to destroy They first make mad. -- Euripides