... included iodine -1 3 1 with a half -life of 8 days; cesium -1 3 4 and cesium -1 3 7 with half-lives of two and 30 years, respec-tively; and several plutonium isotopes with half-lives ranging from 13 to 24,000 ... LA 415 4/frame/C03 Page 21 Wednesday, May 17 , 2000 3:42 PM© 20 01 by CRC Press LLC OCCURRENCE OF TOXICANTS 25 3.7 .1. 9 Tokyo, Japan, 19 70 This episode occurred in Tokyo, Japan, on July 18 , 19 70, ... episodes: (a) Bhopal, India, 19 84; (b) Chernobyl,USSR, 19 86; (c) Alaska’s oil spill, 19 89. LA 415 4/frame/C03 Page 29 Wednesday, May 17 , 2000 3:42 PM© 20 01 by CRC Press LLC 28 ENVIRONMENTAL TOXICOLOGY...