Measurements and Calculations (Introduction to Radiochemistry)
Which detector did you use?
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
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|
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:
Mean value of the counting numbers
The squere of the mean value