226, 88 A radium source contains 50 mg of 238Ra in equilibrium with all its progeny. Assuming 1/2 is 1602 y: 226 (a) What is the decay constant for 238Ra? 88 (b) What is its mean life? (c) How many atoms of 226 Ra does the source contain, based upon its mass and assuming that 226 g = 1 mole? (d) 88 (e) How many atoms of Ra does it contain, based upon its activity? How many millicuries and how many atoms of 2Rn will be present in secular equilibrium? (7₁/2 = = 3.824 d.) 86

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