Difference between revisions of "Measurements and Calculations (Introduction to Radiochemistry)"

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Which detector did you use?
 
Which detector did you use?
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=== = Background  ===
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==== Background  ====
  
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Note down the values from the background counting you started the day before.<br> Counting number N<sub>bck</sub>= &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; counts<br> Counting time t<sub>bck</sub>= &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; sec<br> Counting speed <math>\frac{N_{bck}}{t_{bck}}</math> = &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; cps<br> Standard deviation <math>\frac{\sqrt{N_{bck}}}{t_{bck}}</math>=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cps<br>
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Note down the values from the background counting you started the day before.<br> Counting number N<sub>bck</sub>= &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; counts<br> Counting time t<sub>bck</sub>= &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; sec<br> Counting speed <math>\frac{N_{bck}}{t_{bck}}</math> = &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; cps<br> Standard deviation <math>\frac{\sqrt{N_{bck}}}{t_{bck}}</math>=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cps<br>
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==== Counting Efficiency  ====
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Do a one minute count on every shelf. Use these measurements to calculate the counting-efficiency of the GM-detector in&nbsp;%, for <sup>234m</sup>Pa. The activity of the sample can be calculated from the amount of UO<sub>3</sub> used.
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{| cellspacing="1" cellpadding="1" border="1" style="width: 564px; height: 147px;"
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==== Twenty Measurements with Constant Distance from the Source  ====
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Do twenty measurements on 1 minute with the source in the same position. Calculate the standard deviation and complete the table:
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<br>

Revision as of 15:00, 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 [math]\frac{N_{bck}}{t_{bck}}[/math] =                cps
Standard deviation [math]\frac{\sqrt{N_{bck}}}{t_{bck}}[/math]=                       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 [math]N_{P}-\overline{N}[/math] [math]\left(N_{P}-\overline{N}\right)^{2}[/math]



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