Environmental
   
Instruments
       
Canada Inc.
http://www.eic.nu

Uranium Radiation Safety Toolkit v2.0

Radon Progeny Measured Using Various Calculation Methods 

Acknowledgement: Equations provided by Kari Toews

In this method, an air sample is drawn through a filter for 5 minutes. The filter is then placed in a portable alpha counter.  The counter is usually started at 7 minutes after sample start time and the counts at various times are recorded without stopping or resetting to counter.

   Notes:
   
  Input Fields Calculated Fields   
Enter the sample pump flow rate (L/min): Bq/m3 Po-218 Busigin Method  
Enter the efficiency of the TM372 counter (or equivalent): Bq/m3 Pb-214 Busigin Method 
Self Absorption Factor  Bq/m3 Bi-214 Busigin Method 
Enter the background count rate of the counter (CPM):  WL Busigin Method   
Enter the gross counts at 7 min after sample start time (the time you started the pump): 
Enter the gross counts at 10 min after sample start time: Bq/m3 Po-218 Tsivoglou Method  
Enter the gross counts at 11 min after sample start time: Bq/m3 Pb-214 Tsivoglou Method 
Enter the gross counts at 12 min after sample start time: Bq/m3 Bi-214 Tsivoglou Method 
Enter the gross counts at 15 min after sample start time: WL Tsivoglou Method   
Enter the gross counts at 20 min after sample start time:
Enter the gross counts at 25 min after sample start time: WL Rolle Method
Enter the gross counts at 26 min after sample start time: Amount of Radon entering 
Enter the gross counts at 30 min after sample start time: Air changes per second
Enter the gross counts at 35 min after sample start time: Effective radon 
  Bq of Radon per m3 at

  

 

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