A freshly prepared radioactive source of half life 2 hrs emits radiation of intensity which is 32 times the permissible safe value of intensity. Which of the following is the minimum time after which it would be possible to work safely with this source?
16 hrs
5 hrs
10 hrs
32 hrs
Number of nuclei in terms of half life -
- wherein
Very useful to determine number of nuclei in terms of half life
Initial intensity =32A
Option 1)
16 hrs
Option is incorrect
Option 2)
5 hrs
Option is incorrect
Option 3)
10 hrs
Option is correct
Option 4)
32 hrs
Option is incorrect