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This page contains a number of spreadsheets that I have found useful. Some of them I have used routinely in day-to-day measurement situations. Others I created to create diagrams for the Second Edition of the book, and which I felt might be of interest to the gamma spectrometrist with an enquiring mind.


  • chisquared.xls
    Calculate chi-squared for a number of counts to check that the statistical variablility is satisfactory. Includes a chi-squared graph, on which the calculated chi-squared is plotted.

  • Weighted-Mean.xls
    Calculate, and compare, simple and weighted means.

  • z-test-comparison.xls
    Compare measured values against reference values to assess the concordance of the measured data. Useful for an initial check of your NPL Intercomparison results.


  • atomic-masses.xls
    A complete list of atomic masses, together with the opportunity to calculate decay energies and assess the likelihood of decay by the different decay modes.

  • decay.xls
    Plot single and composite decay curves - just for interest!

  • parent-daughter-decay.xls
    Calculate the combined activity of a parent-daughter combination, together with the equilibrium activity ratio.


  • FWHMMultifit.xls
    Compare linear, quadratic, Debertin and Helmer and square-root quadratic fits to FWHM data. (See the inadequacies of the Canberra Genie equation. (The spreadsheet comes loaded with the pooled data from 27 varied calibrations.)

NORM Analysis

  • NORM-consistency.xls

    Paritions the 186 keV peak between 235U and 226Ra and corrects for certain spectral infererences and then checks all results for consistency. If there is disequilibrium, or to a limited extent non-natural uranium isotopic abundance, allows measurements to be combined in such a way as to take that into account.

Detector Characterization

  • detector-specification-check.xls
    After measuring a 60Co spectrum under standard conditions, calculate compare resolution, peak-to-Compton and relative efficiency with the specification values.

  • Fit-Gaussian-to-Peak.xls
    Take a real spectrum peak, put the channel contents into the spreadsheet and fit a Gaussian and, if necessary a continuum step.

  • MDA-Detector-comparison.xls
    Compare two detectors in terms of resolution and relative efficiency. Get some feeling for the way in which altering these and other parameters alters the MDA - usually, not greatly!

  • random-summing-correction.xls
    Using the two-source method, calculate the random summing correction factor for insertion into your spectrum analysis program.

System Throughput

  • coll-time-v-size.xls
    Calculation of charge collection time as a function of detector size, in terms of relative efficiency.

  • throughput-calculations.xls
    Calculation of system throughput as a function of shaping time and other related parameters according to the equations in Chapter 14. Examples of fitting the model to actual throughput data for analogue and digital systems are included.


  • voight-function.xls
    A plot of the Voight Function compared to the Gaussian and Lorentzian functions. Just for interest.

  • TCS Estimation
    Assess the degree of summing on your own detector. (Point source model only.)


These spreadsheets are provided in good faith for for the convenience of gamma spectrometrists and readers of Practical Gamma-Ray Spectrometry. The author cannot be held responsible for any inconvenience or loss of any kind due to the use of these spreadsheets or the conclusions drawn from them.

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