Accuracy of GPS with respect to surveys

["Pickett, Bruce D" <Bruce.Pickett@PSS.Boeing.com>]

GPS's accuracy for non-military applications is limited to 100 meters.
How do you account for this in your surveys?

Bruce Pickett
bruce.d.pickett@boeing.com

> ----------
> From: 	Clement, Christopher[SMTP:clementc@aecl.ca]
> Sent: 	Thursday, April 30, 1998 2:37 PM
> To: 	Multiple recipients of list
> Subject: 	RE: A hunting we will go!
> 
> Our office does the same sort of surface survey as described below
> except that we throw in a computer and a GPS, and often use multiple
> probes.  This allows us to gather much more data than using the manual
> method for the same amount of survey time.  We can then apply very
> sensitive statistical analysis algorithms to detect levels of
> contamination which would almost certainly have been missed with a
> "visual" analysis.  I've got a few papers on this subject.  Anyone
> interested in more information can respond directly to me.
> 
> ------------------------------------------------------------
> Christopher H. Clement
> Scientific Specialist / Radiation Protection Program Manager
> Low-Level Radioactive Waste Management Office
> Atomic Energy of Canada Limited
> clementc@aecl.ca
> 
> 
> 
> > ----------
> > From: 	Joel Baumbaugh[SMTP:baumbaug@nosc.mil]
> > Sent: 	April 30, 1998 3:49 PM
> > To: 	Multiple recipients of list
> > Subject: 	Re: A hunting we will go!
> > 
> > 	David,
> > 
> > 	Having done similar "hunts" in the past - the first thing you
> > need to do (in my humble opinion) is find the stuff!  Get a high
> > energy scintillation probe (like a Ludlum 44-2), grid your area and
> > start walking back and forth "till you find it.  A high energy probe
> > because the low energy photons won't reach your probe if they
> > originate at any depth and you have enough mid-high energy photons
> > being generated with Th-232 and its progeny. I often let the probe
> > sort of "dangle" (a scientific term if I ever heard one) near the
> > ground and slowly swing it back and forth as I slowly walk my grid.
> > In a grid area (if I have a companion) I will call out the CPM
> > readings so as not to forget where my highest readings are/were.
> > 
> > 	Regarding the pyrophoric part - time for the asbestos under-ware
> > (grin).
> > 
> > 	Good Luck,
> > 
> > 	Joel
> > 
> > ..
> > 
> > At 12:24 PM 4/30/98 -0500, you wrote:
> > >     Folks,
> > >     
> > >     For the sake of an excavation/remediation project, we are
> > assuming 
> > >     that there are 360 pounds of Th-232 buried in a waste pit full
> > of 
> > >     other contaminants.  We don't know exactly where in the pit
> this
> > 
> > >     material is or quite how deep.  What we do know is that it may
> > be 
> > >     pyrophoric and, we suspect, it is concentrated in one
> location.
> > >     
> > >     We would like to find this material before it finds us.  We're
> 
> > >     thinking of using gamma spectroscopy to search for the Ac-228
> > .991 MeV 
> > >     gammas.
> > >     
> > >     Any advice?  Thanks in advance!
> > >     
> > >     David Levy
> > >     Health Physicist
> > >     david.levy@fernald.gov
> > >     (513) 648-3816
> > >
> > >
> > >
> > 
> > Joel T. Baumbaugh, MPH, MHP
> > baumbaug@nosc.mil
> > Radiation Safety Officer
> > SSC San Diego, CA
> > 
> > 
> > 	NOTE:	The contents of this message have not been reviewed, nor
> > approved by
> > the Federal Government, the U.S. Navy, my bosses or my wife...
> > 
> > 	How times change - how everthing remains the same:
> > 
> > 2000 B.C.     "Eat this root."
> > 1000 A.D.     "That root is heathen.  Say this prayer."
> > 1850 A.D.     "That prayer isn't medicine.  Drink this potion."
> > 1940 A.D.     "That potion is snake oil.  Swallow this pill."
> > 1985 A.D.     "That pill is ineffective.  Take this antibiotic."
> > 2000 A.D.     "That anibiotic is ineffective.  Eat this root."
> > 
> > 
>