Help | Contact Us
NukeWorker Menu Airborne Concentration formula

Author Topic: Airborne Concentration formula  (Read 10834 times)

0 Members and 1 Guest are viewing this topic.


  • Guest
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

  • Forum Staff
  • *
  • Posts: 13145
  • Total likes: 534
  • Karma: 5129
  • Gender: Male
  • Stop Global Whining!!!
Re: Airborne Concentration formula
« Reply #1 on: Aug 20, 2009, 02:31 »
Info requested is available to anyone seeking it on this site,

Start on the Study tab at the top of the page.

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 »


  • Guest
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.


NukeWorker ™ is a registered trademark of ™, LLC © 1996-2021 All rights reserved.
All material on this Web Site, including text, photographs, graphics, code and/or software, are protected by international copyright/trademark laws and treaties. Unauthorized use is not permitted. You may not modify, copy, reproduce, republish, upload, post, transmit or distribute, in any manner, the material on this web site or any portion of it. Doing so will result in severe civil and criminal penalties, and will be prosecuted to the maximum extent possible under the law.
Privacy Statement | Terms of Use | Code of Conduct | Spam Policy | Advertising Info | Contact Us | Forum Rules | Password Problem?