Difference between revisions of "Basics about Efficiency Calibration of Gamma Detectors"
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(Created page with "In this exercise you are to do an efficiency calibration of a Ge-detector. The efficiency to any detector is dependent on quantities such as the ã-rays energy, the geometrical s...") |
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In this exercise you are to do an efficiency calibration of a Ge-detector. The efficiency to any | In this exercise you are to do an efficiency calibration of a Ge-detector. The efficiency to any | ||
− | detector is dependent on quantities such as the | + | detector is dependent on quantities such as the <math>\gamma</math>-rays energy, the geometrical shape and size of the |
source, and the distance between the source and detector. | source, and the distance between the source and detector. | ||
In order to make an efficiency calibration we use sources with known amounts of activites. | In order to make an efficiency calibration we use sources with known amounts of activites. | ||
Line 6: | Line 6: | ||
is A, the number of counts obtained with a given detector is R, then the counting efficiency is given | is A, the number of counts obtained with a given detector is R, then the counting efficiency is given | ||
by: | by: | ||
− | <math></math> | + | <math>\epsilon=\frac{R}{A}</math><br> |
+ | To calibrate a ã detector we must also take into consideration that a <math>\gamma</math> ray will not necessarily be | ||
+ | emitted every time the source disintegrate. The frequency <math>\gamma</math> rays are emitted can be found in tables | ||
+ | and is given as the ã intensity, usually symbolised with I<math>\gamma</math>. The formula we use to calculate the | ||
+ | efficiency then looks like this: |
Revision as of 08:49, 27 June 2012
In this exercise you are to do an efficiency calibration of a Ge-detector. The efficiency to any
detector is dependent on quantities such as the
To calibrate a ã detector we must also take into consideration that a ray will not necessarily be
emitted every time the source disintegrate. The frequency rays are emitted can be found in tables
and is given as the ã intensity, usually symbolised with I . The formula we use to calculate the
efficiency then looks like this: