Difference between revisions of "Measurements and Calculations (Introduction to Radiochemistry)"
(→Assessment of the Results) |
|||
Line 163: | Line 163: | ||
==== Assessment of the Results ==== | ==== Assessment of the Results ==== | ||
− | <br> <br> <br> Write down the given measurements and calculate how many % of the countings that are outside of the intervals <N-S<sub>N</sub>,N+S<sub>N</sub> and <N-2S<sub>N</sub>,N+2S<sub>N</sub>>: | + | <br> <br> <br> Write down the given measurements and calculate how many % of the countings that are outside of the intervals <N-S<sub>N</sub>,N+S<sub>N</sub>> and <N-2S<sub>N</sub>,N+2S<sub>N</sub>>: |
{| cellspacing="1" cellpadding="1" border="1" width="200" | {| cellspacing="1" cellpadding="1" border="1" width="200" |
Revision as of 10:42, 8 November 2013
Return to Main
Which detector did you use?
Contents
Background
Note down the values from the background counting you started the day before.
Counting number:
Counting time:
Counting speed:
Standard deviation:
Counting Efficiency
Do a one minute count on every shelf. Use these measurements to calculate the counting-efficiency of the GM-detector in %, for 234mPa. The activity of the sample can be calculated from the amount of UO3 used.
|
Counting number for each shelf (CPM) | Counting Efficency |
1 | |
|
2 | |
|
3 | |
|
4 | |
|
Twenty Measurements with Constant Distance from the Source
Do twenty measurements lasting for one minute with the source in the same position. Calculate the standard deviation and complete the table:
Nr | |||
1 | |
|
|
2 | |
|
|
3 | |
|
|
4 | |
|
|
5 | |
|
|
6 | |
|
|
7 | |
|
|
8 | |
|
|
9 | |
|
|
10 | |
|
|
11 | |
|
|
12 | |
|
|
13 | |
|
|
14 | |
|
|
15 | |
|
|
16 | |
|
|
17 | |
|
|
18 | |
|
|
19 | |
|
|
20 | |
|
|
SUM: | |
SUM: | |
Mean value of the counting numbers
The squere of the mean value
Standard deviation
Discuss the results from and ?
Assessment of the Results
Write down the given measurements and calculate how many % of the countings that are outside of the intervals <N-SN,N+SN> and <N-2SN,N+2SN>:
|
|
|
|
Is there, in your opinion, to many single measurements outside of the given areas? Give a answer based on statistical normal distribution.