Ru-106 can be used to treat melanoma in the eye. This isotope decays by \beta emission with a half-life of 373 days. Suppose a fresh sample contains $6 \times 10^6$ nuclei of Ru-106. What is the decay rate of the sample after 700 days. 35 Bq 86 Bq 240 Bq 180 Bq 449 Bq 4 Bq
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