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jherrod88

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Airborne Concentration formula
« on: Aug 20, 2009, 02:09 »
Hello i am going to take the NUF test tomorrow and i need to know the Airborne concentration formula.

Offline Marlin

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Re: Airborne Concentration formula
« Reply #1 on: Aug 20, 2009, 02:31 »
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http://www.nukeworker.com/study/hp/neu/Part_2_Radiation_Protection/RP-5_Survey_Techniques_And_Emergency_Considerations.pdf

1.5.1 AIRBORNE CONCENTRATION CALCULATION
Once a sample is collected, the radiation protection technician normally performs a field
calculation of the gross beta-gamma airborne concentration in terms of microCuries per
cubic centimeter (mCi/cc) . This calculation is performed with the following formula:

uCi/cc = (ncpm) (uCi) (1 liter) (saf)(efficiency) (volume) (2.22x106 cpm) (1000 cc)

uCi/cc = (ncpm) * (correction factor)(efficiency) (volume)

The correction factor is a simplification of the constants from the above first formula:
correction factor = 1 uCi * 1 liter = 4.5x10-10 2.22x10-6 cpm 1000cc

« Last Edit: Aug 20, 2009, 02:34 by Marlin »

Chimera

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Re: Airborne Concentration formula
« Reply #2 on: Aug 21, 2009, 01:48 »
The air sample formula is simple.  It's just the net counts divided by the counter efficiency to give you dpm.  Divide that by the volume to give you dpm per unit volume.  Everything else is just conversion factors to get to uCi and ml (or cc).  Write down all the units as you set up the formula and you won't go wrong - the units will tell you where to put the conversion factors to end up with uCi/ml.

 


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