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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