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

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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Question

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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Follow-up Question

A radium source contains 50mg of ‘:Ra in equilibrium with all its progeny. Assuming rlI2is 1602y

(d) How many atoms of Ra does it contain, based upon its activity?
(e) How many millicuries and how many atoms of 2 Rn will be present in

secular equilibrium?( T =3.824 d.)

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