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Ru-106 can be used to treat melanoma in the eye. This isotope decays by / emission with a half- life of 373 days. Suppose a

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Ru-106 can be used to treat melanoma in the eye. This isotope decays by / emission with a half- life of 373 days. Suppose a fresh sample contains 6x10" nuclei of Ru-106. What is the decay rate of the sample after 700 days. 240 Bq O 4 Bq 180 Bq 35 Bq 449 Bq 86 B

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