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 filter is counted for 3 minutes at 7 minutes after the sample stop time (12 minutes after sample start time).

   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 for the 3 minute count:			WL Rolle Method
			Bq of Radon per m3 at

 

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