Question

An accident in a nuclear laboratory resulted in deposition
of a certain amount of radioactive material of half life 18 days inside the
laboratory. Tests revealed that the radiation was 64 times more than the
permissible level required for safe operation of the laboratory. What is the
minimum number of days after which the laboratory can be considered safe
for use?

(A) 64 (B) 90 (C) 108 (D) 120​

Answer 1

64=2^6

therefore it will suffer 6 half lives to become fine.

6 half lives in days=18*6

=108 days

Hope this helps.

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Answer 2

Explanation:

According to the question the right answer will be option C.

====>108 days..

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