True Coincidence Summing Correction in Gamma Spectroscopy

precisely known energy and comparing the measured peak position with energy
irrespective of the number of nuclides present in the source. For any source, it should
be ensured that the calibration energies cover the entire range over which the
spectrum is to be used.
In practice, the spectrum should be measured long enough to achieve good statistical
precision for the peaks to be used for calibration.
Figure-1.8 shows an energy calibration using Eu-152. 55 points are plotted together
with the best fit straight line though normally the spectrometer from which the data of
Figure-1.8 were obtained would be calibrated only few points marked. The data
appear to fit the linear relationship very well.
Figure 1.8 Energy Calibration.
E (keV) = I+GC (1.4)
Where I and C are intercept and gradient of calibration line and C is the channel
position. The applicability of equation 1.4 depends on the integral linearity of gamma
spectrometer system and the use to which the information is to be put. Over most of
the spectrum, the errors are small and are most likely to occur at the extremes of the
energy scale.
1.7.2 Efficiency Calibration
What is meant by efficiency depends on how it is used; three efficiencies can be
considered;
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