Question
Question: In order to trace the line of a water-pipe buried 0.4 m below the surface of a field, an engineer wi...
In order to trace the line of a water-pipe buried 0.4 m below the surface of a field, an engineer wishes to add a radioactive isotope to the water. Which sort of isotope should be chosen?
Emitter half-life
A
b-a few hours
B
b -several years
C
g -a few hours
D
g-several years
Answer
g -a few hours
Explanation
Solution
Penetration power should be maximum and half life should be small