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Because its half-life is very long? Personally, I would never dare to touch any radioactive element. I also remember seeing people holding a big chunk of uranium in hand. See here …

The kd is $10^{-15M}$, and the koff (dissociation half life) in the order of days ( say 1day). The diffusion constant of biotin is $350 \mu m^2 /s$ in the mass of cells as well as through the bag. …

The danger of the radio isotopes is measured by their half lives. Radio isotopes having longer half lives are treated as highly toxic and in this case half life is ~24000 years. … Hence you may put radio-isotopes in low toxic (half life few days), mid toxic (half life few years) high toxic (half life much longer than human life) ranges. …

It looks like Bi-209 is almost stable, with an extremely long half life, and its toxicity is low (http://en.wikipedia.org/wiki/Bismuth ). …

it has 2 or 3 moons and one of them is as big as a moon can be. the moon is in lag range 1 and it blocks the light of the star for at least half of the year making the whole planet night time. the planet … The main question of this article is: How can I make such a planet function and have life forms and plants like earth? p.s: I could even change the star, this whole system is imaginary. …

The whole dose still present, corrected for half-life. No shielding. … The isotope in the tracer is $^{18}\mathrm{F}$ which has a half-life of about 110 minutes and a primary line (97%) of $633.5 \text{ keV}$ positrons for a total energy per decay of $1656 \text{ ke}$V. …

The iodine-131 initially released from the incident decayed after 8 days, but other isotopes such as cesium-137 and strontium-90 have a half-life of 28.7 and 30.2 years (about 300 years to completely decay …

The actual toxicity of 210Po is lower than these estimates, because radiation exposure that is spread out over several weeks (the biological half-life of polonium in humans is 30 to 50 days[73]) is somewhat …

Of course, this is an average for the planet as a whole: for example, any given point on Mercury's surface is more or less in thermodynamic equilibrium with the half of the sky visible from that point, … Most life forms we are familiar with would not survive such an environment... In the bright side, tardigrades would probably still make it. …

The low specific activity $\mathrm{\frac{Bq}{g}}$ can be explained with the large half-life of the isotopes. … . $$ Therefore, large half-life $T_{\frac{1}{2}}$ results in very small activity $A$ per mass $m$. It is a completely different question if the uranium has been irradiated. …

Most radioactive materials from an atomic blast have a maximum half-life of 50 years. … Furthermore, the reaction has, both initially and over its life, produced a far higher amount of radioactive materials. …

This increased power would make a person over-heat, which is a potentially life-threatening condition. … This effect would pile up as the running session becomes longer, to the point of having a considerable impact in a half- or in a marathon. …