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A 4.5 mg sample of Sr-90 is in secular equilibrium with its daughter Y-90.
a- How many curies of Sr-90 are present?
b- How many curies of Y-90 are present?
c- What is the mass of Y-90 present?
d- What will the activity of Y-90 be after 100 years?
2– Starting with a 20.0 mCi sample of pure Sr-90 at time t=0, how long will it take for the total activity (Sr-90 + Y-90) to build up to 30.0 mCi?
4– Sr-90 is to be used as a heat source for generating electrical energy in a satellite.
a- How much Sr-90 activity is required to generate 50 watts of electrical power, if the conversion efficiency from heat to electricity is 30%?