Look up: Technetium-99

1. 
   technetium-99
   A radioisotope of technetium which is the decay product of technetium-99m and has a weak beta emission and a physical half-life of 213,000 years. ... (05 Mar 2000) ...
   Found on http://www.mondofacto.com/facts/dictiona
   
   
2. 
   Technetium-99
   `Technetium-99` (99Tc) is an isotope of technetium which decays with a halflife of 211 thousand years, emitting soft beta rays but no gamma rays, and has a fission product yield of 6.0507% for thermal neutron fission of uranium-235. The weak beta emission is stopped by the walls of laboratory glassware. Soft X-rays are emitted when the beta particles are stopped, but as long as the body is kept more than 30 cm away these should pose no problem. ...
   Found on http://en.wikipedia.org/wiki/Technetium-
   
   
3. 
   technetium-99
   (from the article `radioactivity`) ...the thyroid gland where this isotope accumulates. Phosphorus-32 is useful in the identification of malignant tumours because cancerous cells tend ... The radionuclide used in virtually all phases of radionuclide imaging is technetium-99. It has the disadvantage of a long half-life (six hours), ... ...
   Found on http://www.britannica.com/eb/a-z/t/19
   
   
4. 
   technetium-99
   A radioisotope of technetium which is the decay product of technetium-99m and has a weak beta emission and a physical half-life of 213,000 years.
   Found on