?35ERates of Radioactive Decay (Section)Some watch dials
Chapter , Problem 35E(choose chapter or problem)
35E
Rates of Radioactive Decay (Section)
Some watch dials are coated with a phosphor like ZnS, and a polymer in which some of the 1H atoms have been replaced by 3H atoms, tritium. The phosphor emits light when struck by the beta particle from the tritium decay, causing the dials to glow in the dark. The half-life of tritium is 12.3 yr. If the light given off is assumed to be directly proportional to the amount of tritium, by how much will a dial be dimmed in a watch that is 50 yr old?
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