This lecture covers the fundamental equations that describe the decay of radionuclides. Basic equations and their utility are presented. Equations for mixtures, equilibrium, and branching of radionuclides are covered. Examples are provided for error evaluation from counts, activity determination, evaluation of half life, and lifetime of isotopes. Discussion of natural radiation and dating are given. Examples are provided for dating from 238U, 14C, and the Oklo reactor. The lecture time for part 1 is 43 minutes. Part 2 is 60 minutes. The lecture is assigned 26-Jan-17. The PDF Quiz 3 is due 5-Feb-17.
Good evening, I completed the lecture, and the PDF Quiz is on it's way. Thank you!
ReplyDeletethanks. PDF quiz received.
Deletefor the question 1: i get λ=ln(87/80.04)/60s=0.0013897; and i put λ into σ equation get the σ=2.5; i am not sure i am right? but what is average value? i have no ideal for this question
ReplyDeleteThis question is based on lecture 3 part 1 page 9. Based on the total counts the error can be found. Using the error the expected range of values can be determined.
DeleteThe decay rate is 87 Bq, so 87 decays/second. In one minute you can determine the total decays, with only 8 % of the decays counted. This provides the total counts. One standard deviation is the square root of the total counts. The counts should be expected to fall within the average +- one standard deviation.
I finished the lecture and have sent in Quiz 3
ReplyDeletethanks for the comment
DeleteI fixed my answer to question 1. I believe I found my mistake. This time I found the total counts then used its square root to find the standard deviation. Thanks for the help!
DeleteA general comment on question 1 for PDF quiz 3 is provided. What the question is assessing are counts that can occur within one standard deviation of the average. The first thing to do is find the average.
ReplyDeleteDecay/second * seconds * detector efficiency
This is the total counts. The error is the square root of the total counts. The range is then the average +- the square root of the total counts.
Good afternoon!
ReplyDeleteI have finished the lectures and quiz for PDF 3 and sent my quiz to you via email.
Thanks!
Halli
thank you for the comment
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ReplyDeleteGood evening, I completed the lecture and submitted quiz 3.
ReplyDeleteSubmitted
ReplyDeleteThank you for the notification.
Deletesubmitted my PDF quiz
ReplyDeletethanks for the comment and quiz submission
DeleteHi Sir
ReplyDeleteI have sent my pdf_quiz 3
sorry about the other e-mails, I made a mistake with the half life when calculating decay constant..I forgot to switch the years to seconds. overall
very interesting lecture.
great to hear you caught the error. Don't worry about other e-mails.
DeleteHi Ken!
ReplyDeleteI sent you an email with Quiz 3 attached!
I've completed Quiz 3 and sent it to your email. Thanks!
ReplyDeleteQuiz 3 has been sent! Thank you.
ReplyDeleteI have submitted quiz 3.
ReplyDeleteI completed quiz 3 and sent it. Thank you.
ReplyDeleteQuiz #3 Submitted
ReplyDeleteI have finished lecture 3 and submitted my pdf quiz. Thank you!
ReplyDeleteI have submitted quiz 3 via email
ReplyDeletethanks for the comments and the quizzes!
ReplyDeleteJust submitted the quiz and finished watching lecture 3 parts 1 and 2.
ReplyDeleteHi! I submitted my quiz! Just wondering if the outline on the radchem website is up-to-date? So the test is scheduled to be assigned this week?
ReplyDeleteThanks,
Tia
yes, the test will be assigned this week. The test on the site is from last year. I will remove it now to avoid confusion.
Deletecan you please post the answers to quiz 3..its not up yet
ReplyDeleteAnswers posted, sorry about any delay.
DeleteLecture 3 finished, working on four now. I submitted the quiz last night
ReplyDeleteQuiz 3 sumbitted, thanks.
ReplyDeletethanks for the quizzes and comments for Lecture 3.
ReplyDelete