Når det gjelder trådstarters påstand om radioaktiviteten til Tungsten så er ikke den noe å skrive om.
http://en.wikipedia.org/wiki/Tungsten#Isotopes
Naturally occurring tungsten consists of five isotopes whose half-lives are so long that they can be considered stable. Theoretically, all five can decay into isotopes of element 72 (hafnium) by alpha emission, but only 180W has been observed[15] to do so with a half-life of (1.8 ± 0.2)×1018 years; on average, this yields about two alpha decays of 180W in one gram of natural tungsten per year.
Og hvis dette er et problem så er det også sånn at bly har radioaktive isotoper:
http://en.wikipedia.org/wiki/lead#isotopes
Lead can be found or produced in many isotopes, with three of them being stable. The four natural isotopes of lead are 204Pb, 206Pb, 207Pb, and 208Pb with the slightly radioactive 204Pb regarded as completely primordial lead, and the stable isotopes 206, 207, 208 being formed probably from the radioactive decay of two isotopes of uranium (U-235 and U-238) and one isotope of thorium (Th 232).
The one common radiogenic isotope of lead, 202Pb, has a half-life of about 53,000 years.