Airborne Processing – Parameters

GammaSpec parameters control file for airborne processing

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// NASVD NOISE REDUCTION

nasvdMethod 1 // 1-by group 2-by cluster

firstNasvdChannel 15 // first spectrum channel for nasvd

lastNasvdChannel 245 // last spectrum channel for nasvd

numNasvdVectorsSaved 20 // Num spectral components to save

numNasvdVectorsUsed 8 // Num spectral components to use for smoothing

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// ENERGY CALIBRATION

encalMethod 1 // 1-automatic (cross-correlation) 2-manual(peak identification)

thoriumPeakChannel 204 // channel number at thorium photopeak maximum

calibrationPeakEnergy 0.609 // calibration peak (MeV) for energy calibration

calibrationPeakEnergy 1.460 // calibration peak (MeV) for energy calibration

calibrationPeakEnergy 2.614 // calibration peak (MeV) for energy calibration

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// WINDOW DATA SOURCE

windowDataSource 2 // 1-raw spec, 2-NASVD by group spec, 3-NASVD by cluster spec

backgroundDataSource 1 // 1-raw spec, 2-NASVD by group spec, 3-NASVD by cluster spec

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// AIRCRAFT/COSMIC BACKGROUND ESTIMATION

cosAirFullSpectrum 1 // 0 – window method; 1 – full spectrum

cosAirFilePath ..\demo_data\airborne_spectrometry\processing_spectral_ratio\aircraft_and_cosmic_spectra.txt

` // The aircraft_and_cosmic_spectra.txt file referenced above

// is created by the Aircraft And Cosmic Calibration tool

aircraftBackground_tc 79.94 // total count aircraft background (cps)

aircraftBackground_k 13.1 // potassium aircraft background (cps)

aircraftBackground_u 0.108 // uranium aircraft background (cps)

aircraftBackground_t 0.122 // thorium aircraft background (cps)

aircraftBackground_up 0.38 // uranium upward aircraft background (cps)

cosmicBackground_tc 0.744 // total count cosmic background stripping coeff

cosmicBackground_k 0.066 // potassium cosmic background stripping coeff

cosmicBackground_u 0.054 // uranium cosmic background stripping coeff

cosmicBackground_t 0.061 // thorium cosmic background stripping coeff

cosmicBackground_up 0.0036 // uranium upward cosmic background stripping coeff

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// RADON BACKGROUND ESTIMATION

backgroundMethod 1 // 1 – spectral ratio; 2 – upward detector

bgdIntegrationInterval 100 // sum over this many spectra for each radon estimate

radonStripTotalCount 13.40 // Rn counts in TC window for each Rn count in U window

radonStripPotassium 1.06 // Rn counts in K window for each Rn count in U window

radonStripThorium 0.12 // Rn counts in TH window for each Rn count in U window

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// SPECTRAL RATIO METHOD – RADON ESTIMATION

backgroundRatioModel 2 // 2 (2-commponent), 4 (4-component), 5 (auto-C2) or 6 (precalc C2)

lowPeakAircraftBgd 6.0 // aircraft background in low-energy window (cps)

lowPeakCosmicBgd 0.02 // cosmic background stripping for low-energy window

lowPeakEnergy 0.609 // low-energy peak (MeV) used by spectral ratio method

c1CoeffSpecRatio 1.81 // c1 coefficient

c2CoeffSpecRatio 0.35 // c2 coefficient

c3CoeffSpecRatio 0.00 // c3 coefficient (4-component model only)

c4CoeffSpecRatio -0.018 // c4 coefficient (4-component model only)

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// UPWARD DETECTOR METHOD – RADON ESTIMATION

a1CoeffUpDetector 0.091 // a1 coefficient

a2CoeffUpDetector 0.072 // a2 coefficient

akCoeffUpDetector 0.867 // ak coefficient

auCoeffUpDetector 0.209 // au coefficient

atCoeffUpDetector 0.119 // at coefficient

bkCoeffUpDetector 0.0 // bk coefficient

buCoeffUpDetector 0.0 // bu coefficient

btCoeffUpDetector 0.0 // bt coefficien

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// STRIPPING CORRECTION

alphaStrip 0.3098 // stripping ratio at ground level – alpha

betaStrip 0.3830 // stripping ratio at ground level – beta

gammaStrip 0.8381 // stripping ratio at ground level – gamma

ainverseStrip 0.06 // stripping ratio at ground level – a

alphaChangePerMetre 0.00049 // change (/m) with height above ground – alpha

betaChangePerMetre 0.00065 // change (/m) with height above ground – beta

gammaChangePerMetre 0.00069 // change (/m) with height above ground – gamma

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// HEIGHT CORRECTION

nominalSurveyHeight 80.0 // nominal survey height

attenuationCoeff_tc 0.00703 // height attn coeff (/m) – total count

attenuationCoeff_k 0.0094 // height attn coeff (/m) – potassium

attenuationCoeff_u 0.0084 // height attn coeff (/m) – uranium

attenuationCoeff_t 0.0074 // height attn coeff (/m) – thorium

maxCorrectionHeight_tc 250.0 // max height for height correction (m) – total count

maxCorrectionHeight_k 250.0 // max height for height correction (m) – potassium

maxCorrectionHeight_u 180.0 // max height for height correction (m) – uranium

maxCorrectionHeight_t 250.0 // max height for height correction (m) – thorium

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// SENSITIVITY CORRECTION

sensitivity_tc 51.51 // window sensitivity – total count (cps/nG/h)

sensitivity_k 110.4 // window sensitivity – potassium (cps/%K)

sensitivity_u 8.33 // window sensitivity – uranium (cps/ppmU)

sensitivity_t 5.79 // window sensitivity – thorium (cps/ppmTh)

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