Radioactivity

Radioactivity - This compares to the known value of 156...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Radioactivity Section 422, B.J. Anderson Stephen Harper Partner: Sarah Bass Tuesday, November 30, 2005 “The work presented in this report is my own, and the data were obtained by my lab partners and myself during the lab period.”
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Data Analysis and Results: Part I: A graph of the data was made in excel. Ln N vs Ln R y = -2.1178x + 2.9861 R 2 = 0.9965 0 1 2 3 4 5 6 7 8 9 -2.5 -2 -1.5 -1 -0.5 0 Ln N Ln R (ln m) From the above graph, a value of -2.1178 ± 0.0723 was found for n. The value of A was 19.81 ± 0.83. Part II: For the second portion of the lab, a background level of 35 counts was used and this graph was made in excel.
Background image of page 2
Counts vs. Time y = 151.38e -0.0043x R 2 = 0.9524 0 20 40 60 80 100 120 140 160 180 200 0 100 200 300 400 500 600 700 Time (s) Counts From the above graph, the half life of barium137 is 161 seconds.
Background image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: This compares to the known value of 156 seconds. Discussion: In the first part of the lab, a value of -2.1178 ± 0.0723 was found for n. The value of A was 19.81 ± 0.83. The uncertainty in these measurements stems from variance in background radiation and also from distance placement from the Geiger tube. Also, with only five different values obtained, it is tough to get a totally accurate reading. More measurements would have to be taken. In the second part of the lab, an acceptable half life of 161 seconds was found. A background radiation level of 35 counts was used. The value obtained was close to the value expected....
View Full Document

This note was uploaded on 11/27/2011 for the course PHYS 105 taught by Professor Walker during the Fall '08 term at UNC.

Page1 / 3

Radioactivity - This compares to the known value of 156...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online