NukeWorker Forum

Career Path => Radiation Safety => Topic started by: Radconpro on Nov 29, 2017, 07:21

Title: Floor Monitor Scan Surveys
Post by: Radconpro on Nov 29, 2017, 07:21

How would one convert the cpm of the floor monitor to units of dpm/100cm² with a floor monitor? I have heard different opinions on whether to use the probe correction factor of 5.82 or not....

Title: Re: Floor Monitor Scan Surveys
Post by: Rennhack on Nov 29, 2017, 09:29

It depends on the area of the probe, and the probes efficiency for the nuclide of interest.  Are you looking for C-14 or U-238 or TC-99 or Co-60 or...

Title: Re: Floor Monitor Scan Surveys
Post by: atomicarcheologist on Nov 29, 2017, 10:29

Convert your reading to DPM. Then, determine the factor of 100 which is the area your probe "sees", i.e. if you have a 1000 cm2 probe your factor would be 10.Take your meter reading in DPM and divide by this factor and you will have DPM/100cm2.

Title: Re: Floor Monitor Scan Surveys
Post by: Radconpro on Dec 04, 2017, 10:02

Thank you.  The probe is 582cm2 in size. That is what I thought.

Title: Re: Floor Monitor Scan Surveys
Post by: GLW on Dec 04, 2017, 10:15

scan surveys include observation interval, etc., particularly for NUREG 1507 compliant surveys, ISO 7503 compliant surveys have somewhat differing criteria, since you are asking for area and unit conversions for scan surveys I took a mulligan and added  [2cents] ,...

Title: Re: Floor Monitor Scan Surveys
Post by: SloGlo on Dec 05, 2017, 11:12

Quote from: Radconpro on Dec 04, 2017, 10:02

Thank you.  The probe is 582cm2 in size. That is what I thought.

mite bee. atomicarcheologist rote "area your probe "sees" " witch wood indicate he was alluding to rennhack's spiel of isotopes, inn particular low energies.