A gold foil weighing 3.5 mg is irradiated by a thermal-neutron flux density of 10¹³n cm 1-2 s−1. The interaction cross section is σ = 96 × 10-24 cm²/atom, 198 Au and T1/2 = 2.70 d for (a) How long will it take for the foil to achieve an activity of 100 mCi of 198 Au? (b) What is the equilibrium level of activity? (c) How long would it have taken to reach the same activity if the decay of 198 Au were negligible during that time? (d) What is the true activity reached at that time?
A gold foil weighing 3.5 mg is irradiated by a thermal-neutron flux density of 10¹³n cm 1-2 s−1. The interaction cross section is σ = 96 × 10-24 cm²/atom, 198 Au and T1/2 = 2.70 d for (a) How long will it take for the foil to achieve an activity of 100 mCi of 198 Au? (b) What is the equilibrium level of activity? (c) How long would it have taken to reach the same activity if the decay of 198 Au were negligible during that time? (d) What is the true activity reached at that time?
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the asnwer should be a) 1.74 days, b)278 mCi, c)1.4 days d) 84 mCi.
Transcribed Image Text:A gold foil weighing 3.5 mg is irradiated by a thermal-neutron flux density of
10¹³n cm
1-2 s−1. The interaction cross section is σ = 96 × 10-24 cm²/atom,
198 Au
and T1/2
= 2.70 d for
(a) How long will it take for the foil to achieve an activity of 100 mCi of 198 Au?
(b) What is the equilibrium level of activity?
(c)
How long would it have taken to reach the same activity if the decay of
198 Au were negligible during that time?
(d) What is the true activity reached at that time?
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