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A radioactive decay counter is switched on at \( \mathrm{t}=0 . \mathrm{A} \beta \) - active sample is present near the counter. The counter registers the number of \( \beta \) - particles emitted by the sample. The counter registers \( 1 \times 10^{5} \)
P \( \beta \) - particles at \( t=36 \mathrm{~s} \) and \( 1.11 \times 10^{5} \beta \)-particles at \( t=108 \mathrm{~s} \). Find \( \mathrm{T}_{1,2} \) of this sample.

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