Which of the following best matches the description?Naturally occurring radioactive isotope used in nuclear reactors.

A. decommissioning
B. beta radiation
C. transuranic waste
D. light-water reactor
E. heavy-water reactor
F. U-235
G. radioactive half-life
H. alpha radiation
I. thermal pollution
J. nuclear fusion
K. nuclear fission
L. gamma radiation
M. radiation
N. moderator
O. rem
P. nuclear breeder reactor


Answer: F

Environmental & Atmospheric Sciences

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