Nuclear fission product
Health concerns

Isotope
Radiation
Half-life
GI absorption
Notes
Strontium-90/yttrium-90
β
28 years
30%
-
Cesium-137
β,γ
30 years
100%
-
Promethium-147
β
2.6 years
0.01%
-
Cerium-144
β,γ
285 days
0.01%
-
Ruthenium-106/rhodium-106
β,γ
1.0 years
0.03%
-
Zirconium-95
β,γ
65 days
0.01%
-
Strontium-89
β
51 days
30%
-
Ruthenium-103
β,γ
39.7 days
0.03%
-
Niobium-95
β,γ
35 days
0.01%
-
Cerium-141
β,γ
33 days
0.01%
-
Barium-140/lanthanum-140
β,γ
12.8 days
5%
-
Iodine-131
β,γ
8.05 days
100%
-
Tritium
β
13 years
100%
-

Question: What are the radioactive isotopes of nuclear fission?
Answer: ⁹⁰Sr and ¹³⁷Cs are the radioisotopes.