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Answer letter d 

226 1. A radium source contains 50 mg of ²3ºRa in equilibrium 88 with all its progeny. Assuming T₁/2 is 1602 yr: a) What is the decay constant for 22 Ra? b) What is its mean life? 88 c) How many atoms of 228Ra does the source contain, based upor its mass and assuming that 226 g = 1 mole? d) How many atoms of 2Ra does it contain, based upon its activity?
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Transcribed Image Text:226 1. A radium source contains 50 mg of ²3ºRa in equilibrium 88 with all its progeny. Assuming T₁/2 is 1602 yr: a) What is the decay constant for 22 Ra? b) What is its mean life? 88 c) How many atoms of 228Ra does the source contain, based upor its mass and assuming that 226 g = 1 mole? d) How many atoms of 2Ra does it contain, based upon its activity?
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