Which isotopes of which elements contributed mainly to contamination in the Chernobyl accident? 3 sentences long.

Initial radiation exposure in contaminated areas was due to short-lived iodine-131; later caesium-137 was the main hazard. (Both are fission products dispersed from the reactor core, with half lives of 8 days and 30 years, respectively. 1.8 EBq of I-131 and 0.085 EBq of Cs-137 were released.)

f=ma newton's second law 7x8=56n

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this