The phenomenon of radioactivity was discovered by___________________?

A. Rapid heat transfer from the core
B. Accelerating the reaction rate in the core
C. Breeding neutrons
D. Accelerating the neutrons

A. 0.01
B. 0.25
C. 1.2
D. 7

A. Acts both as an efficient coolant as well as a moderator
B. Can be heated to a higher temperature without pressurizing
C. Is less prone to radiation damage
D. All A., B. and C.

A. U-238
B. U-234
C. U-235
D. U-232

A. α-ray
B. Proton
C. Position
D. β-ray

A. α
B. β
C. γ
D. α & β