Quiz 1 is posted. It is assigned for 19 June 2014. The first deadline is 24-Jun-15. There will be a second deadline for submission of corrected questions on 29-Jun-15. Please post any and all questions related to Quiz 1 to the blog.
This first celebration of learning covers:
Lecture 1: Introduction, Chart of the Nuclides
Lecture 2: Nuclear Properties
Lecture 3: Decay Kinetics
Lecture 4: Alpha Decay 
On question 4.4 of the quiz, what decay chain brings about Au197 from Pb208? I haven't been able to find any sequence of decays that starts with absorbing an alpha particle that also satisfies the conditions
ReplyDeleteIt is not a decay chain. If I start with 208Pb and add 4He I get 212Po. Then imagine the 212Po breaks into 15B and 197Au. On the Q value calculator put 208Pb as the target, 4He as the projectile, and 197Au as the ejectile. see what you get. You can vary this for a number of isotopes. In nuclear reactions the compound nuclear can have sufficient energy to form a range of products.
ReplyDeleteOn question 7:
ReplyDeleteIs there a way to input the initial activity into the ERG Nuclide program? The output table seems to be in percentages, except it doesn't add to 100.
You can change it in the table on the bottom left corner of the screen. There is an default "100" and you can alter that directly.
DeleteCorrect! This is why I state at time zero there is only 225Ra present and I give you the activity. So the answer for t=0 is in the question. Also this demonstrates some limitations in the program. Great job if you got this far with the ERG nuclide program.
ReplyDeleteWith the question regarding the liquid drop model I understood but on Friday in the group meeting we were discussing the equation and there was some differences with the asymmetry portion with what was given us and what Daniel was going over with us? Can you please look into this or explain.
ReplyDeleteYou will have to ask Daniel the detail. I did not see his notes. There are modification to the models, he may have been using a different one.
DeleteFinished and submitted the quiz. I thought it was very straightforward and a great review of what we learned thus far. Had a bit of trouble with the ERG Program due to my stubborn Apple computer, but other than that the rest of the quiz was fine.
ReplyDeleteyes, that is a common problem.
DeleteI just submitted this. It wasn't too bad, number three with the hindrance factor was a little confusing for me, but other than that, it was pretty straight forward.
ReplyDeleteThanks for your comments. We will see how you did.
DeleteQuiz 1 was due yesterday. If you have not yet submitted please do so. The answers will be posted tonight.
ReplyDeleteThe answers to Quiz 1 are now available at: http://radchem.nevada.edu/classes/rfss/quizzes.html. The second deadline is 29 June 15. If you submit corrections please all answers in your test.
ReplyDeleteI had a few questions on the quiz 1 answers. For number 3, the alpha half life for 240Pu and the one before it have the same value in your answers, but they should be different values. Also for 4.4, I got a similar answer, but off by a factor of ten. The Q calculator says -17140.2 KeV if I looked it up correctly.
ReplyDeleteI have a similar question on #3, and on #4.6, I got 179.856 MeV from the Q-value calculator.
DeleteI made the corrections. I made a copy and paste error on question 3 for 240Pu. Decimal in wrong place of 4.4. For 4.6 I get 183.24 MeV from http://nrv.jinr.ru/nrv/webnrv/qcalc/.
DeleteYou get 179.8 if do the spontaneous fission of 239Pu.
I will repost the corrected test.
That website proved to be very useful. Thank you!
DeleteI agree with Derek's comments. In addition, on question 9 I got a different half life and thus different decay constants for 126Sn and 128Te. Also, 8Be decays by double alpha emission according to the table of the isotopes.
ReplyDeleteSometime the database differs. For 8Be alpha decay or double alpha is acceptable.
DeleteFor 8Be I will accept alpha or double alpha, both are listed. If your half lives are different just provide the references. Part of this exercise is to show the decay and differ in the literature.
ReplyDeleteWhen re submitting our work will we receive a grade sent back to us?
ReplyDeleteGrades will be sent after the posting of the answers.
DeleteThe answers and comments for Quiz 1 are now posted.
ReplyDelete