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One microgram of radioactive sodium Na 24/11 with (a)half-life of 15 hours was injected into (a)living system for (a)bio-assay. How long will it take for the radioactive subtance to fall up to 25% of the initial value? [1996]

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One microgram of radioactive sodium Na 24/11 with (a)half-life of 15 hours was injected into (a)living system for (a)bio-assay. How long will it take for the radioactive subtance to fall up to 25% of the initial value? [1996]






 
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