Difference between revisions of "Measurements and Calculations (Introduction to Radiochemistry)"
From mn/safe/nukwik
(→Twenty Measurements with Constant Distance from the Source) |
|||
Line 42: | Line 42: | ||
| <math>\left(N_{P}-\overline{N}\right)^{2}</math> | | <math>\left(N_{P}-\overline{N}\right)^{2}</math> | ||
|- | |- | ||
− | | 1 | + | | 1 |
| | | | ||
| | | | ||
| | | | ||
|- | |- | ||
− | | 2 | + | | 2 |
| | | | ||
| | | | ||
| | | | ||
|- | |- | ||
− | | 3 | + | | 3 |
| | | | ||
| | | | ||
| | | | ||
|- | |- | ||
− | | 4 | + | | 4 |
| | | | ||
| | | | ||
| | | | ||
|- | |- | ||
− | | 5 | + | | 5 |
| | | | ||
| | | | ||
| | | | ||
|- | |- | ||
− | | 6 | + | | 6 |
| | | | ||
| | | | ||
| | | | ||
|- | |- | ||
− | | 7 | + | | 7 |
| | | | ||
| | | | ||
| | | | ||
|- | |- | ||
− | | 8 | + | | 8 |
| | | | ||
| | | | ||
| | | | ||
|- | |- | ||
− | | 9 | + | | 9 |
| | | | ||
| | | | ||
| | | | ||
|- | |- | ||
− | | 10 | + | | 10 |
| | | | ||
| | | | ||
| | | | ||
|- | |- | ||
− | | 11 | + | | 11 |
| | | | ||
| | | | ||
| | | | ||
|- | |- | ||
− | | 12 | + | | 12 |
| | | | ||
| | | | ||
| | | | ||
|- | |- | ||
− | | 13 | + | | 13 |
| | | | ||
| | | | ||
| | | | ||
|- | |- | ||
− | | 14 | + | | 14 |
| | | | ||
| | | | ||
| | | | ||
|- | |- | ||
− | | 15 | + | | 15 |
| | | | ||
| | | | ||
| | | | ||
|- | |- | ||
− | | 16 | + | | 16 |
| | | | ||
| | | | ||
| | | | ||
|- | |- | ||
− | | 17 | + | | 17 |
| | | | ||
| | | | ||
| | | | ||
|- | |- | ||
− | | 18 | + | | 18 |
| | | | ||
| | | | ||
| | | | ||
|- | |- | ||
− | | 19 | + | | 19 |
| | | | ||
| | | | ||
| | | | ||
|- | |- | ||
− | | 20 | + | | 20 |
| | | | ||
| | | | ||
| | | | ||
|- | |- | ||
− | | SUM: | + | | SUM: |
| | | | ||
− | | SUM: | + | | SUM: |
| | | | ||
|} | |} | ||
Line 151: | Line 151: | ||
<br> | <br> | ||
+ | Mean value of the counting numbers <br> <math>\overline{N}=\frac{\sum N_{P}}{20}=\underline{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\mbox{counts}</math><br> | ||
+ | The squere of the mean value <math>sqrt{\overline{N}}=\underline{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\mbox{counts}/maht> | ||
+ | Standard deviation <math>S_{N}=\sqrt{\frac{\left(N_{P}-\overline{N}\right)^{2}}{19}}=\underline{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}</math> |
Revision as of 15:09, 2 July 2012
Which detector did you use?
Background
Note down the values from the background counting you started the day before.
Counting number Nbck= counts
Counting time tbck= sec
Counting speed = cps
Standard deviation = cps
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 on 1 minute with the source in the same position. Calculate the standard deviation and complete the table:
Nr | Np | ||
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