Difference between revisions of "Measurements and Calculations (Introduction to Radiochemistry)"
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Note down the values from the background counting you started the day before.<br> Counting number:<br> | Note down the values from the background counting you started the day before.<br> Counting number:<br> | ||
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==== Counting Efficiency ==== | ==== Counting Efficiency ==== |
Revision as of 09:00, 3 July 2012
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Which detector did you use?
Contents
Background
Note down the values from the background counting you started the day before.
Counting number:
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 | |
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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 | |||
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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>:
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Is there, in your opinion, to many single measurements outside of the given areas? Give a answer based on statistical normal distribution.