The beta- particles emitted in the decay of 3 h tritium, Ask an Expert

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The β^-particles emitted in the decay of ³ H (tritium) interact with matter to create light in a glow-in-the-dark exit sign. At the time of manufacture, such a sign contains 15.0 Ci of ³ H.

(a) What is the mass of the tritium?

(b) What is its activity 5.00 y after manufacture?

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