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# A source contains two phosphorous radio nuclides$$_{ 15 }^{ 33 }{ P }\left( { T }_{ 1/2 }=14.3d \right)$$ and $$_{ 15 }^{ 33 }{ P }\left( { T }_{ 1/2 }=25.3d \right)$$. Initially, $$10$$% of the decays come from $${T}_{1/2}$$. How long one must wait until $$90$$% do so?

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