j . Correct the radiation data by subtracting the mean back- 

 ground count rate. Then correct the remainder, if it is significantly- 

 higher than background, for the time of the decay since the isotope was 

 injected. 



CCR = (NCR - 3o)e At + 3a 



log e (2) 



where A j^ 



and 



where CCR = the corrected count rate 



NCR = the net (observed radiation value less mean background) 

 count rate 



a = the standard deviation of the background count rate 



t = the elapsed time from the injection to the time of 

 the fix 



Ti = the isotope half life in hours. 

 -5 



Only radiation count rates that are significantly greater than back- 

 ground are corrected for time of decay. Otherwise, in a survey made one 

 or more half lives after the injection, the correction would inflate back- 

 ground radiation readings to such a degree that they would appear to be 

 significant. 



k. Compute the weighted mean and weighted standard deviation 

 of the coordinate location of the radioactivity. Compute the 95 percent 

 confidence limits of the mean radiation location. 



n 



I XDi • CCRi 



XD 



i=l 



n 



I CCRi 

 i=l 



YD 



I YDi • CCRi 

 i=l 



n 



I CCRi 

 i=l 



1. Print out the sequence number, time, radar beacon ranges, 

 coordinates, and activity for each line of data. 



m. Return to the beginning of the program to read in more data 

 control cards, and process another file of data unless it is the end of 

 job, in which case processing ends. 



