226 A radium source contains 50 mg of "88Ra in equilibrium with all its progen- Assuming 71/2 is 1602 y: (a) What is the decay constant for Ra? 226 88 (b) What is its mean life? 226 (c) How many atoms of 238Ra does the source contain, based upon its mass and assuming that 226 g = 1 mole? 88 (d) How many atoms of 226Ra does it contain, based upon its activity? How many millicuries and how many atoms of 2Rn will be present in secular equilibrium? (7₁ (e) 86 - 3 924

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