Question

A human body required the 0.01 Curie activity of radioactive susbtance after 24 hours. Half life of radioactive is 6 hours. Then max. activity of radioactive sustance that can be injected will be : -

Answer 1

GIVEN:

Half Life =6hrs

Number of half life (n) in 24 hrs = 24/6 = 4

n=4

The Activity after 4 half life = 0.01

The initial activity of the sample can be calculated as

Activity after 4 half life = initial activity × (1/2)n

0.01 M = initial activity × (1/2)4

Initial activity = 0.01 × 2 4 = 0.16 M