Timeline for Radioactive decay of uranium-238
Current License: CC BY-SA 3.0
12 events
| when toggle format | what | by | license | comment | |
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| May 7, 2018 at 13:15 | vote | accept | 2good4this | ||
| Feb 5, 2016 at 13:26 | vote | accept | 2good4this | ||
| May 7, 2018 at 13:15 | |||||
| Feb 5, 2016 at 7:46 | comment | added | mira | It is, in fact, a concentration- "concentration is the abundance of a constituent divided by the total volume of a mixture". Abundance is expressed here in the terms of Becquerels. You can easily convert Bq to grams or mols-1 $m^3$ of the wall material contains $3900 \ Bq= 0.3 \ g = 1.3 \times 10^{-3} \ mol$ of $^{238}U$ (hint: specific activity). The most common way in this case would be in $Bq/kg$ but you don't know the material density... | |
| Feb 5, 2016 at 2:24 | comment | added | 2good4this | Just realised that your solution gives the activity per unit volume of the uranium, how would one obtain the concentration of uranium in the walls from this quantity? | |
| Feb 4, 2016 at 13:42 | history | edited | mira | CC BY-SA 3.0 |
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| Feb 4, 2016 at 13:38 | comment | added | mira | @2good4this Happy to help! If the time is not specified you must make an assumption or leave it as an insufficiently defined problem. Assuming the equilibrium seems as natural choice, but of course it depends on particular situation. Your results should be accompanied by a specification of your assumptions anyway... | |
| Feb 4, 2016 at 12:29 | vote | accept | 2good4this | ||
| Feb 5, 2016 at 3:51 | |||||
| Feb 4, 2016 at 12:29 | comment | added | 2good4this | Thank you mira, this is a brilliant response. So, if the time of build-up (1 week in this case) had not been specified, I would have had no choice but to assume radioactive equilibrium between the uranium and radon from the beginning? | |
| Feb 4, 2016 at 10:59 | history | edited | mira | CC BY-SA 3.0 |
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| Feb 4, 2016 at 10:51 | history | edited | mira | CC BY-SA 3.0 |
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| Feb 4, 2016 at 10:00 | history | edited | mira | CC BY-SA 3.0 |
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| Feb 4, 2016 at 9:48 | history | answered | mira | CC BY-SA 3.0 |