GENERAL                       

Project                       Lefroy
Survey area                   Lefroy-West
Located data type             1 Second Radiometric Data

Surveyed by                   GPX AIRBORNE PTY LTD.
Job number                    Lefroy
Processed by                  GPX AIRBORNE PTY LTD.
Creation date                 June 2007

SURVEY SPECIFICATIONS         

Survey flown                  March - April 2007
Traverse line spacing         100 metres
Traverse line direction       000-180 degrees
Tie line spacing              1000 metres
Tie line direction            090-270 degrees

Survey height                 90 metres

LOCATED DATA FORMAT           

Variable                      Units          Undefined      From  To    Format    

Line number                                  9999999        1     8     I8        
Easting (MGA55)               metres         9999999.99     9     19    F11.2     
Northing (MGA55)              metres         9999999.99     20    30    F11.2     
Fiducial                                     99999.99       31    39    F9.2      
Flight number                                999            40    43    I4        
Direction (1=E, 2=N, 3=W, 4=S)               9              44    45    I2        
Date (YYYYMMDD)                              99999999       46    54    I9        
Time (GPS)                    seconds        99999.99       55    63    F9.2      
Longitude (GDA94)             degrees        999.999999     64    74    F11.6     
Latitude (GDA94)              degrees        999.999999     75    85    F11.6     
Radar altimeter               metres         9999.9         86    92    F7.1      
Pressure                      millibars      9999.9         93    99    F7.1      
Temperature                   degrees C      99.9           100   104   F5.1      
Raw total count               cps            999999         105   111   F7.0      
Raw potassium                 cps            9999           112   116   F5.0      
Raw uranium                   cps            9999           117   121   F5.0      
Raw thorium                   cps            9999           122   126   F5.0      
Raw cosmic                    cps            99999.9        127   131   F5.0      
Final total count             cps            99999.99       132   140   F9.2      
Final potassium               cps            99999.99       141   149   F9.2      
Final uranium                 cps            99999.99       150   158   F9.2      
Final thorium                 cps            99999.99       159   167   F9.2      
Raw 256 channel data          cps            999            168   1191  I4        
Energy calibrated 256 channel cps            9999.9         1192  2983  F7.1      

DATA PROCESSING               

COORDINATE DATA               
All lines are scissored to the following rules:                            
  1) A 'smooth' edge outside the area boundary.                            
  2) Maximum line overlap of 0 fiducials within                            
     the area boundary.                                                    

The local projection is a UTM projection based on the                      
GDA94 spheroid with a central meridian of 147 East degrees.                
System parallax of 0.6 fiducial has been removed.                          

RADIOMETRIC DATA              

NASVD has been applied to channel data prior to windowing                  
System parallax of 0.0 fiducial has been removed.                          
Height attenuated to 90m AGL                                               
Airborne radon has been removed                                            

AIRCRAFT BACKGROUND                                UNITS
Total Count                           81.67          cps
Potassium                             23.35          cps
Uranium                                0.59          cps
Thorium                                0.67          cps
COSMIC STRIPPING RATIOS       
Total Count                        0.811201             
Potassium                          0.044663             
Uranium                            0.038646             
Thorium                            0.043791             
COMPTON STRIPPING RATIOS      
alpha                                 0.250             
beta                                  0.400             
gamma                                 0.810             
a                                     0.060             
HEIGHT ATTENUATION COEFFICIENT
Total Count                        0.006928    per metre
Potassium                          0.009043    per metre
Uranium                            0.007186    per metre
Thorium                            0.006892    per metre
WINDOW ENERGY LEVELS             Low Energy High Energy
Total Count                           410.0      2810.0          keV
Potassium                            1370.0      1570.0          keV
Uranium                              1660.0      1860.0          keV
Thorium                              2410.0      2810.0          keV

