RPS - Correction

Use the Specify Correction Parameters 1 dialog option (RPSCORR GX) to correct airborne radiometric data for the effects of spectral overlap (STRIPPING) and height attenuation. It also converts potassium, thorium and uranium data to apparent radioelement concentrations.

Specify Correction Parameters 1 dialog options

STRIPPING RATIOS:

- - alpha (Default is 0.24)

- - beta (Default is 0.37)

- - gamma (Default is 0.70)

- - a (Default is 0.05)

- - b Default is 0.0)

- - c (Default is 0.0)

NOMINAL SURVEY ALTITUDE (metres)

Specify the nominal survey altitude in metres (Default is 120).

Specify Correction Parameters 2 dialog options

HEIGHT ATTENUATION COEFF:

(per metre at STP):

Total Count (Default is –0.0070)

Potassium (Default is –0.0088)

Uranium (Default is –0.0082)

Thorium (Default is –0.0070)

BROAD SOURCE SENSITIVITIES:

Total Count (uR/hr) (Default is 23)

Potassium (cps/% K) (Default is 75)

Uranium (cps /ppm eU) (Default is 7.5)

Thorium (cps /ppm eTH) (Default is 4.5)

Application Notes

The radiometric data move from LEVL to CORR as noted by channel names. The GX applies stripping and height attenuation corrections, and converts previously levelled data to apparent Radioelement concentrations. To correct your database, complete the fields in the Specify Corrections Parameters dialog box (stripping, nominal survey altitude and broad source sensitivities) or accept the defaults as displayed. Select OK. You then see a progress bar indicating that the system is correcting the data.

When the GX finishes, we suggest you compare the raw, filtered (FILT), levelled (LEVL) and corrected (CORR) channels in the profile window.

Channels and Parameters

ULEVL

Input U Channel Name

KLEVL

Input K Channel Name

THLEVL

Input TH Channel Name

TCLEVL

Input TC Channel Name

 

 

UCORR

Output U Channel Name

KCORR

Output K Channel Name

THCORR

Output TH Channel Name

TCCORR

Output TC Channel Name

TCEXPOSURE

Output TC Ground Level Exposure Channel Name

RALTSTP

Equivalent Height at STP channel

 

 

ALPHA

ALPHA Stripping Ratio

BETA

BETA Stripping Ratio

GAMMA

GAMMA Stripping Ratio

ASTRIP

A Stripping Ratio

BSTRIP

B Stripping Ratio

GSTRIP

G Stripping Ratio

NOMALT

Nominal survey altitude [metres]

UATTEN

Height Attenuation Coefficient for U

KATTEN

Height Attenuation Coefficient for K

THATTEN

Height Attenuation Coefficient for TH

TCATTEN

Height Attenuation Coefficient for TC

USENS

Broad Source Sensitivity for U

KSENS

Broad Source Sensitivity for K

THSENS

Broad Source Sensitivity for TH