Other man-made sources are small contributors to the total . Atmospheric nuclear weapons tests released an estimated 111-185 PBq . The 1979 accident at the Three Mile Island nuclear power plant released about 1.6 PBq ( 43 kCi ) . The Chernobyl accident released about 35 PBq , and the Fukushima Daiichi accident released an estimated 44-84 PBq
Three Mile Island nuclear power plant
Three Mile Island accident
Krypton-85