OR/14/014 Appendix 6: Calibration report aircraft ZS-SSC - Revision history

Dbk: /* Summary */

2015-08-06T09:02:58Z

Summary

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	==Summary==		==Summary==
	The calibration was carried out according to the procedures recommended in a ~~“Guide~~ to the Technical Specifications for Airborne Gamma-Ray ~~Surveys”~~ by R.F GRASTY and BRS MINTY ~~“Record~~ 1995/60.		The calibration was carried out according to the procedures recommended in a 'Guide to the Technical Specifications for Airborne Gamma-Ray Surveys' by R.F GRASTY and BRS MINTY Record 1995/60.

	The pre and post thorium source test results for the attenuation and cosmic calibrations are less than the recommended maximum of 3 % for annual calibrations. The goodness of fit coefficients, R squared, are all close to 1.		The pre and post thorium source test results for the attenuation and cosmic calibrations are less than the recommended maximum of 3 % for annual calibrations. The goodness of fit coefficients, R squared, are all close to 1.

Dbk: /* 5 Sensitivity calibration */

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5 Sensitivity calibration

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	==5 Sensitivity calibration==		==5 Sensitivity calibration==
	The concentrations at the base point of the Geological Survey of Namibia (GSN) Dynamic Calibration Range at Henties Bay were measured to determine if there were any significant differences in concentrations as measured by the GSN and as measured for the current survey. The measurements are attached in [[#APPENDIX C \| Appendix C]]. The concentration differences were less than 1 standard deviation and therefore the GSN concentrations for the DCR concentrations were used. These are for potassium, uranium and thorium 3.79 percent, 4.37 ppm, 16.7 ppm respectively.		The concentrations at the base point of the Geological Survey of Namibia (GSN) Dynamic Calibration Range at Henties Bay were measured to determine if there were any significant differences in concentrations as measured by the GSN and as measured for the current survey. The measurements are attached in [[#APPENDIX C \| Appendix C below]]. The concentration differences were less than 1 standard deviation and therefore the GSN concentrations for the DCR concentrations were used. These are for potassium, uranium and thorium 3.79 percent, 4.37 ppm, 16.7 ppm respectively.

	From the equations of the lines for potassium, uranium and thorium determined by the above regressions the average response at ground level and 80 meters was determined in counts per second for potassium, uranium and thorium. The count rates for each channel at ground level and 80 meters respectively were divided by the respective average concentrations of the test range to give the sensitivity.		From the equations of the lines for potassium, uranium and thorium determined by the above regressions the average response at ground level and 80 meters was determined in counts per second for potassium, uranium and thorium. The count rates for each channel at ground level and 80 meters respectively were divided by the respective average concentrations of the test range to give the sensitivity.

Dbk: /* Height attenuation tests */

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Height attenuation tests

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	==Height attenuation tests==		==Height attenuation tests==
	Height attenuation tests were conducted at the Namibian Geological Survey Dynamic Calibration Range at Henties Bay Namibia on 10th July and 11th July 2013. The first attenuation calibration was rejected as it was found that there was a temperature inversion layer at approximately ~~130m~~. For the second calibration there was no wind and the sky was clear.		Height attenuation tests were conducted at the Namibian Geological Survey Dynamic Calibration Range at Henties Bay Namibia on 10th July and 11th July 2013. The first attenuation calibration was rejected as it was found that there was a temperature inversion layer at approximately 130 m. For the second calibration there was no wind and the sky was clear.

	The spectrometer system was run for two hours prior to the attenuation flight to allow it to stabilize. Standard pre-flight test background and thorium source checks were recorded for three minutes. The aircraft was flown low level to the attenuation site to maintain stabilization.		The spectrometer system was run for two hours prior to the attenuation flight to allow it to stabilize. Standard pre-flight test background and thorium source checks were recorded for three minutes. The aircraft was flown low level to the attenuation site to maintain stabilization.
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	The observed data for each level was then background corrected by subtracting the mean of the background observed over water at that level. After this Compton stripping was performed. The co-efficients used were those determined at Lanseria airport. The altimeter was then corrected for standard temperature and pressure. For each channel a regression was performed between the mean STP altitudes and the natural logs of the background corrected, stripped data.		The observed data for each level was then background corrected by subtracting the mean of the background observed over water at that level. After this Compton stripping was performed. The co-efficients used were those determined at Lanseria airport. The altimeter was then corrected for standard temperature and pressure. For each channel a regression was performed between the mean STP altitudes and the natural logs of the background corrected, stripped data.

	The results are shown in [[#APPENDIX B \| Appendix B]].		The results are shown in [[#APPENDIX B \| Appendix B below]].

	===The attenuation co-efficients determined are:===		===The attenuation co-efficients determined are:===

Dbk: /* Cosmic calibration */

2015-08-06T09:00:52Z

Cosmic calibration

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	\| <p align="center">.9892</p>		\| <p align="center">.9892</p>
	\|}		\|}
	~~The graphs are shown in <u>Appendix</u><u> D</u>~~

	==Summary==		==Summary==

Dbk: /* Cosmic calibration */

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Cosmic calibration

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	Cosmic calibrations were carried out on the 9th and 13th of July 2013 offshore from Swakopmund Namibia. The first calibration was rejected as it was affected by the presence of radon. The on shore wind was very light. The second calibration was carried out approximately 200 km out to sea. There were onshore winds of approximately 10 knots.		Cosmic calibrations were carried out on the 9th and 13th of July 2013 offshore from Swakopmund Namibia. The first calibration was rejected as it was affected by the presence of radon. The on shore wind was very light. The second calibration was carried out approximately 200 km out to sea. There were onshore winds of approximately 10 knots.

	The spectrometer was allowed to stabilize for two hours prior to the calibration flight to ensure stability. The standard pre-flight calibrations background and thorium were performed and recorded. En route to the area the air in aircraft was flushed. Each altitude was flown at a constant height and for duration of 15 minutes. The following height levels were flown 13,000 ft, ~~12000~~ ft, ~~11000~~ ft, 10,000 ft, 9000 ft, and 8000 ft. Tests were flown from the highest to lowest altitude.		The spectrometer was allowed to stabilize for two hours prior to the calibration flight to ensure stability. The standard pre-flight calibrations background and thorium were performed and recorded. En route to the area the air in aircraft was flushed. Each altitude was flown at a constant height and for duration of 15 minutes. The following height levels were flown 13 000 ft, 12 000 ft, 11 000 ft, 10 000 ft, 9000 ft, and 8000 ft. Tests were flown from the highest to lowest altitude.

	The results are as follows:		The results are as follows:

Dbk: /* Pad calibration procedure */

2015-08-06T08:58:30Z

Pad calibration procedure

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	* The Spectrometer system was allowed to stabilize on thorium for two hours prior to the calibration.		* The Spectrometer system was allowed to stabilize on thorium for two hours prior to the calibration.
	* The aircraft was positioned out of the way of any traffic for the duration of the tests.		* The aircraft was positioned out of the way of any traffic for the duration of the tests.
	* The ~~“hand sources”~~ (Caesium, Uranium and Thorium) were stored in a lead box at 10 meters away from the aircraft when not used.		* The 'hand sources' (Caesium, Uranium and Thorium) were stored in a lead box at 10 meters away from the aircraft when not used.
	* The four pads, background pad (B-pad), Potassium pad (K-pad), Uranium pad (U-pad) and thorium pad (Th-pad) were stored at 15 meters away from the aircraft when not used.		* The four pads, background pad (B-pad), Potassium pad (K-pad), Uranium pad (U-pad) and thorium pad (Th-pad) were stored at 15 meters away from the aircraft when not used.
	* Each detector pack was calibrated separately.		* Each detector pack was calibrated separately.
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	* The response from the B-pad was then recorded for a period of 10 minutes. This was repeated for the K-pad, U-pad and Th-pad. After the Thorium pad the response from the B-pad was again recorded. Following this the standard post calibration background and thorium source test was carried out.		* The response from the B-pad was then recorded for a period of 10 minutes. This was repeated for the K-pad, U-pad and Th-pad. After the Thorium pad the response from the B-pad was again recorded. Following this the standard post calibration background and thorium source test was carried out.
	* This procedure was then repeated for the other pack.		* This procedure was then repeated for the other pack.
	* The statistics for the data were then calculated and the stripping coefficients were calculated with the routines from Jens Hovgaard’s program “''~~padwin”~~''.		* The statistics for the data were then calculated and the stripping coefficients were calculated with the routines from Jens Hovgaard’s program ''padwin''.

	==Pad calibration results==		==Pad calibration results==

Dbk: /* Pad calibration results */

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Pad calibration results

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	==Pad calibration results==		==Pad calibration results==
	Refer to [[#APPENDIX A \| ~~'''~~Appendix A ~~'''~~]] for observed results.		Refer to [[#APPENDIX A \| Appendix A ]] for observed results.

	===Results of pack A/N 3022===		===Results of pack A/N 3022===

Dbk: /* CALIBRATION REPORT AIRCRAFT ZS-SSC - Prepared by: CGG Airborne Survey - Date: July 2013 */

2015-05-05T15:08:42Z

CALIBRATION REPORT AIRCRAFT ZS-SSC - Prepared by: CGG Airborne Survey - Date: July 2013

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	{{OR/14/014}}		{{OR/14/014}}
	=~~CALIBRATION REPORT AIRCRAFT~~ ZS-SSC - Prepared by: CGG Airborne Survey - Date: July 2013=		=Calibration Report Aircraft ZS-SSC - Prepared by: CGG Airborne Survey - Date: July 2013=

	==Aircraft ZS-SSC (Reims F406)==		==Aircraft ZS-SSC (Reims F406)==

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← Older revision	Revision as of 16:08, 5 May 2015
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Dbk: /* Pad calibration procedure */

2015-04-13T11:24:44Z

Pad calibration procedure

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	* After the stabilization period the outputs from the pack not being calibrated were physically disconnected. The inputs from the pack not being calibrated were switched off in the GR820 console. Power however was maintained to the pack not being calibrated to ensure its stabilization. The above method ensures that only the response from the pack being calibrated is recorded.		* After the stabilization period the outputs from the pack not being calibrated were physically disconnected. The inputs from the pack not being calibrated were switched off in the GR820 console. Power however was maintained to the pack not being calibrated to ensure its stabilization. The above method ensures that only the response from the pack being calibrated is recorded.
	* Standard background and thorium source tests were performed using aircraft jigs prior and post pad calibrations.		* Standard background and thorium source tests were performed using aircraft jigs prior and post pad calibrations.
	* ~~·The~~ response from the B-pad was then recorded for a period of 10 minutes. This was repeated for the K-pad, U-pad and Th-pad. After the Thorium pad the response from the B-pad was again recorded. Following this the standard post calibration background and thorium source test was carried out.		* The response from the B-pad was then recorded for a period of 10 minutes. This was repeated for the K-pad, U-pad and Th-pad. After the Thorium pad the response from the B-pad was again recorded. Following this the standard post calibration background and thorium source test was carried out.
	* This procedure was then repeated for the other pack.		* This procedure was then repeated for the other pack.
	* The statistics for the data were then calculated and the stripping coefficients were calculated with the routines from Jens Hovgaard’s program “''padwin”''.		* The statistics for the data were then calculated and the stripping coefficients were calculated with the routines from Jens Hovgaard’s program “''padwin”''.