pertaining to the bile, to the bile ducts, or to the gallbladder. biliary catheter (biliary decompression catheter) a catheter inserted via a skin incision through the liver and common bile duct into the duodenum.
Not all of the atoms of a radioisotope decay at the same time, but they decay at a rate that is characteristic to the isotope. The rate of decay is a fixed rate called a half-life. The half-life of a radioisotope describes how long it takes for half of the atoms in a given mass to decay.
The longest-lived isotope, 210 At, has a half-life of only 8.3 hours. There are about 20 isotopes known, all of which are radioactive. Astatine is a halogen and possibly accumulates in the thyroid like iodine. 1  Name: astatine.2  Symbol: At. 3  Atomic number: 85.4  Relative atomic mass (Ar) : [ 210 ].he longest-lived isotope, 210 At, has a half-life of only 8.3 hours. There are about 20 isotopes known, all of which are radioactive. Astatine is a halogen and possibly accumulates in the thyroid like iodine. 1  Name: astatine. 2  Symbol: At. 3  Atomic number: 85. 4  Relative atomic mass (Ar) : [ 210 ].