KJM5911 Lab Exercise 3 - Gamma Spectroscopy

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UnderConstruction pict22.gifUnderConstruction pict17.gifWarning - under construction - you are welcome to read it, but it will change...

Learning Goals

After completing this exercise you should

  • Understand the processes by which gamma radiation is absorbed in the detector.
  • Understand how the detector (and it's electronics) transform the absorbed energy from the gamma rays into electrical pulses which is continously sorted according to pulse height and presented as a histogram (number of events vs energy) - a "spectrum".
  • Know the basic parameters of a spectroscopy system (spectrum, real time, life time, dead time, channels, etc.).
  • Know the relationship between channel number and energy, how to derive this relationship ("energy calibration") and be able to evaluate it's uncertainty.
  • Recognice the different parts of a gamm-ray spectrum.
  • Know how "peaks" in the spectrum are analysed and understand the results (you should understand terms like: ROI, gross count, net count, peak fitting, FWHM, etc.). You should understand how the software calculate and subtract the background under the peaks.
  • Know the relationship between number of counts and gamma-rays emitted by the source (and the disintegration rate).


Experimental Procedure

Safety Aspects