Standard 3 gamma spectrometer corrections (T52)
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1. file specifications and parameter settings choose Show INTREPID displays them in a separate window See Displaying options and using Task specification files for details and an example of a set of specifications S3GSC performs stripping before height correction The coefficients would be different if it performed the corrections in the reverse order In the current version there is no graphic display of the S8GSC process You can view Help information by choosing options from the Help menu See Help You can execute S8GSC as a batch task by command using a task specification job file that you have previously prepared See Displaying options and using Task specification files for details Specifying input and output files To use S8GSC you must specify The line dataset to be processed with aliases to identify the required fields e The dataset containing the air temperature and pressure readings The traverse line type field To identify the fields in the dataset give them aliases and specify the aliases and the file names in the dataset See Vector dataset field aliases in INTREPID database file and data structures R05 for more information about aliases This section lists the aliases required and has instructions for specifying the files for the S8GSC process Choose the options as required from the File menu Fite Constants Heip Specify Radiometrics Dataset Open Air Input Data Base Open Input Line2. task specification file required INTREPID will load the file and use its contents to set all of the parameters for the S8GSC process See Displaying options and using Task specification files for information about task specification files Save Options If you wish to save the current S38GSC file specifications and parameter settings as an task specification file use this menu option to specify the filename and save the file See Displaying options and using Task specification files for information about task specification files Sample aliases Alias Begin Potassium potassium Uranium uranium Thorium thorium TotalCount totalcount Fiducial FID Clearance clearance LineNumber LINE FlightNumber flight SurveyNumber survey Alias End Standard 3 correction constants Library Help Top Use the options from the Constants menu to define The stripping height attenuation and sensitivity constants The height above which data is to be ignored due to the unreliability of the height attenuation correction e The nominal survey height to which you require the data reduced Fite Constants Help Stripping Attenuation f Height sensitivity 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Standard 3 gamma spectrometer corrections T52 5 Library Help Top 4 Back gt The Stripping Ratios To set the Stripping Ratios choose Stripping from the Constants menu IN
3. INTREPID User Manual Standard 3 gamma spectrometer corrections T52 1 Library Help Top q Back gt Standard 3 gamma spectrometer corrections T52 af Standard 3 Corrections performs the following corrections to the standard gamma ray spectrometer data channels Potassium Uranium Thorium and Total Count 1 Normalising measurements to a standard distance above ground level 2 Stripping correction for Compton scattering 3 Optional Conversion of count rates to elemental ground concentrations See Standard 3 corrections theory in Radiometrics theoretical background R25 for this tool s background theory Using the S3GSC corrections tool gt gt To use S3GSC with the INTREPID graphic user interface 1 Library Help Top Choose Standard 3 from the Radiometrics menu in the Project Manager or use the command gamadj exe INTREPID displays the S8GSC window ka Intrepid Gam maRayAdjustment Tool V3 0 Demo File Constants Heip Apply Gamma ray data adjustments 1 Compton Scattering stripping 2 Height corrections 3 Optional reduction to ground concentrations If you have previously prepared file specifications and parameter settings for S3GSC load the corresponding task specification file using Load Options from the File menu See Specifying input and output files for detailed instructions If all of the specifications are correct in this file go to step 7 If you wish to modify any settings
4. TREPID displays the Stripping Ratios dialog box Intrepid GammaRayAdjustment Tool 3 0 Demo l Stripping Ratios slope Use the dialog box to set the base level ground level value and slope change per metre of the stripping ratios a B y in equations 1 above See Compton scattering correction stripping theory in Radiometrics theoretical background R25 INTREPID will set default values according to the AGSO system See the footnote to Compton scattering correction stripping theory in Radiometrics theoretical background R25 The Attenuation Coefficients To set the Attenuation Coefficients choose Attenuation from the Constants menu INTREPID displays the Attenuation Coefficients dialog box intrepid GammaRayAdjustment Tool V3 0 De Attenuation Coefficients Potassium Uranium Thorium Total Count Use the dialog box to set the Attenuation Coefficients values of u for Potassium Uranium Thorium and Total Count in equation 2 above See Height correction theory in Radiometrics theoretical background R25 INTREPID will set default values according to the AGSO system See the footnote to Height correction theory in Radiometrics theoretical background R25 Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Standard 3 gamma spectrometer corrections T52 6 Library Help Top 4 Back gt Height Constants To set the Height Constant
5. Type Base Load Options Save Options puit In each case INTREPID displays an Open dialog box Use the directory and file selector to locate the line dataset directory or file you require See Specifying input and output files in Introduction to INTREPID R02 for information about specifying files Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Standard 3 gamma spectrometer corrections T52 3 Library Help Top 4 Back gt Specify Radiometrics Dataset Use this option to specify the lines dataset you wish to process To perform the S8GSC corrections you must specify the following field aliases Alias Field Potassium potassium channel data counts second Uranium uranium channel data counts second Thorium thorium channel data counts second TotalCount total count data counts second Clearance height of the aircraft above ground level metres Fiducial fiducial record optional survey number field for linking to the temperature pressure data SurveyNumber FlightNumber optional flight number field for linking to the temperature pressure data LineNumber traverse line number field for linking to the temperature pressure data When you choose Apply INTREPID will modify the fields with aliases Potassium Uranium Thorium and TotalCount in the line dataset you specify Open Air Input Dataset Use this to specify the line dataset that contains the atmospher
6. carry out the following steps as required Specify the dataset to be processed Use Specify Radiometrics Dataset from the File menu See Specifying input and output files for detailed instructions Specify the atmospheric temperature and pressure files Use Open Air Input Database from the File menu See Specifying input and output files for detailed instructions Specify the line type field if required for eliminating selected traverse lines from the process Use LineType from the File menu See Specifying input and output files for detailed instructions Specify the parameters for the corrections using the options from the Constants menu See Standard 3 correction constants for details When you have made specifications and settings according to your requirements choose Apply INTREPID will perform the corrections The corrected data overwrites the original data If you wish to record the specifications for this process 1n a job file in order to repeat a similar task later or for some other reason use Save Options from the file menu See Specifying input and output files for detailed instructions If you wish to repeat the process repeat steps 2 7 varying the specifications as required 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Standard 3 gamma spectrometer corrections T52 2 Library Help Top q Back gt 10 To exit from S8GSC choose Quit from the File menu To view your current
7. ic pressure and temperature data This data may have a lower sampling rate than the radiometrics data and therefore may be in a different INTREPID dataset INTREPID will only adjust the height data for temperature and pressure if you specify this dataset For INTREPID to use this data you must specify the following aliases for fields Temperature temperature degrees Celsius atmospheric pressure millibars SurveyNumber optional the survey number field for linking to the radiometrics data FlightNumber optional the flight number field for linking to the radiometrics data traverse line number field for linking to the radiometrics data Note that if the temperature and pressure data is in a different line dataset the aliases must be listed in the actual line dataset that contains the temperature and pressure data Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Standard 3 gamma spectrometer corrections T52 4 Library Help Top lt 4 Back gt Open LineType Use this to specify the line type field for eliminating selected traverse lines from the process If you do not specify a line type field INTREPID will process all traverse lines data If you specify a line type field INTREPID will process all traverse lines except those whose line type is 16384 Load Options If you wish to use an existing task specification file to specify the S3GSC process use this menu option to specify the
8. k1 survey rad SEC AirDataBaseDirectory disk1l survey rad TEN alphaBase 0 46 alphaSlope 0 00 betaBase 0 44 betaSlope 0 00 gammaBase 0 81 gammaSlope 0 00 PotassiumAttenuation 0 01 UraniumAttenuation 0 01 ThoriumAttenuation 0 01 TotalCountAttenuation 0 01 MinimumHeight 0 00 MaximumHeight 250 00 NominalHeight 150 00 PotassiumSensitivity 1 00 UraniumSensitivity 1 00 ThoriumSensitivity 1 00 UseTempAndPressure Yes Parameters End Process End Library Help Top 2012 Intrepid Geophysics 4 Back gt
9. ou can store sets of file specifications and parameter settings for S8GSC in task specification job files gt gt To create a task specification file with the S8GSC tool 1 Specify all files and parameters 2 If possible execute the task choose Apply to ensure that it will work 3 Choose Save Options from the File menu Specify a task specification file INTREPID will add the extension job INTREPID will create the file with the settings current at the time of the Save Options operation For full instructions on creating and editing task specification files see Appendix F Task Specification Files in Volume 1 gt gt To use a task specification file in an interactive S8GSC session Load the task specification job file File menu Load Options modify any settings as required then choose Apply gt gt To use a task specification file for a batch mode S3GSC task Type the command gamadj exe with the switch batch followed by the name of the task specification file For example if you had a task specification file called surv329 job you would use the command gamadj exe batch surv329 job 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Standard 3 gamma spectrometer corrections T52 9 Library Help Top 4 Back gt Task specification file example Here is an example of a S8GSC task specification file Process Begin Name Input Parameters Begin RadiometricsDataBaseDirectory dis
10. s choose Height from the Constants menu INTREPID displays the Height Constants dialog box intrepid GammaRayaAdjustment Tool Y Use the dialog box to set the Height Constants minimum height the height below which you wish INTREPID to ignore the radiometrics data default value 0 maximum height the height above which you wish INTREPID to ignore the radiometrics data due to the unreliability of the height attenuation correction default value 250m survey nominal height to which you wish to reduce your survey data H in equation 2 See Height correction theory in Radiometrics theoretical background R25 default value 100m Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Standard 3 gamma spectrometer corrections T52 7 Library Help Top Apply Exit Library Help Top 4 Back gt Sensitivities To set the Sensitivities choose Sensitivity from the Constants menu INTREPID displays the Sensitivities dialog box intrepid GammaRayAdjustment Tool V3 0 D Sensitivities Potassium 1 0 Uranium ppm 1 0 Thorium ppm 1 0 L Use this dialog box to specify the factors for converting count rates to ground concentrations for Potassium Uranium and Thorium Express each factor in counts per second per unit concentration For each element INTREPID will divide the measured and corrected count rates by the factor you specify to obtain the ground concentra
11. tions of e Potassium in percentage by mass e Uranium in parts per million and e Thorium in parts per million If you do not have values for sensitivity constants or do not wish to convert your data to ground concentration set the values of the sensitivity constants to 1 0 INTREPID will leave your data in counts second See Sensitivity conversions theory in Radiometrics theoretical background R25 for more information about sensitivity If you do not set a value for the sensitivity for one or more elements INTREPID will use the default value 1 0 for each unspecified constant When you choose Apply INTREPID performs the corrections and modifies the files indicated by the Potassium Uranium and Thorium aliases To exit from S3GSC choose Quit from the file menu 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Standard 3 gamma spectrometer corrections T52 8 Library Help Top Help lt 4 Back gt You can use the help menu to display help text on the topics shown in the menu illustration below File Constants Help File Stripping Attenuation Height Sensitivity Displaying options and using Task specification files Displaying options To display the current file specifications and parameter settings Choose Show in the S8GSC window INTREPID displays the current options in a separate report window Using task specification files Library Help Top Y
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