As accident in a nuclear laboratory resulting in deposition of a certain amount of radioaction radioctive material of half life `18 `days inside the loboratory Teste revealed that the radiation was `64` times more than the permissible lovel repuered for save 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`
Text Solution
Verified by Experts
The correct Answer is:
C
`(A)/(A_(0)) = (1)/(2^(@))` `:. 2^(@) = (A_(0))/(A) = (64)/(1) = 2^(6) rArr n = 6` `:. Time = 6 xx t_(1/2) = 6 xx 18 = 108`
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