Table 2. Principle radionuclides released owing to the Chernobyl nuclear plant disaster.

Principle radionuclides released owing to the Chernobyl nuclear disaster	Half-life	Activity released (PBq)
Volatile elements
Iodine-131	8.04 days	∼1760
Iodine-133	20.8 h	∼2500
Caesium-137	30 years	∼85
Caesium-136	13.1 days	36
Caesium-134	2.06 years	∼47
Tellurium-132	3.26 days	∼1150
Tellurium-129m	33.6 days	240
Intermediately volatile
Strontium-89	50.5 days	∼115
Strontium-90	29.12 years	∼10
Rubidium-103	39.3 days	>168
Rubidium-106	368 days	>73
Barium-140	12.7 days	240
Refractory elements
Zirconium-95	64 days	84
Molybdenum-99	2.75 days	>72
Cerium-141	32.5 days	84
Cerium-144	284 days	∼50
Neptunium-239	2.35 days	400
Plutonium-238	87.74 years	0.015
Plutonium-239	24065 years	0.013
Plutonium-240	6537 years	0.018
Plutonium-241	14.4 years	∼2.6
Plutonium-242	376000 years	0.00004

Adapted from the study of Saenko et al [6].