The rad is a measure of the
A.
amount of radiation absorbed by tissue where 1 rad corresponds
to 0.01 J of energy absorbed by 1 kilogram of tissue.
B.
total energy absorbed by an object exposed to a radioactive
source.
C.
lethal threshold for radiation exposure.
D.
number of alpha particles emitted by exactly one gram of a
radioactive substance.
E.
none of these is correct.