Iodine-13 1 is a radioactive isotope of elemental iodine and an artificial radionuclide (nuclear fission product), with the symbol I- 13 1, with a half-life of 8.02 days. Under normal circumstances, nature does not exist.
20 1 1 On March 26th, 2008, a very small amount of artificial radionuclide iodine-13 1 was found in the air in the northeast of Heilongjiang Province, China, but these very small amounts of radioactive substances will not affect the environment and public health in China, and similar findings were also found in the eastern coastal areas.
Iodine 13 1 is a beta decay nuclide, emitting beta rays (99%) and gamma rays (1%). The maximum energy of beta ray is 0.6065 MeV, and the energy of main gamma ray is 0.364 MeV. The half-life is 8.02 days. 3.7× 10 times gram of iodine-13 1 point source weighs 8.05× 10 mg, and the irradiation rate at 1 cm is 2.3 roentgen/hour. It can be safely operated with a 5 cm thick lead shield.
Iodine 13 1 is a highly toxic nuclide, and the key organ is thyroid. The effective half-life of human body is 7.6 days, and the maximum allowable storage in human body is 1.8× 10 Bekkerel. The maximum allowable concentrations of iodine-13 1 in the air of radioactive workplaces and open water sources are 0.33 and 22 Bekkerel/L, respectively. Iodine 13 1 has the same chemical properties as elemental iodine.