How much will a dial be dimmed in a watch that is 50 years

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Reference no: EM131105732

Some watch dials are coated with a phosphor, like ZnS, and a polymer in which some of the ¹H atoms have been replaced by ³H atoms, tritium.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 years old?

Reference no: EM131105732

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