Sno-str 1996 96-48

Concentration ofradon in supply air 3 pCi/1 Minimum reduction factor for radon 100 Time for which reduction must be maintained 10 days ^—— 7 • From the tests completed recently2 at the SNO underground laboratory at the INCO Creighton mine it was found that activated charcoal has considerable adsorption capacity even at room temperature for the removal ofradon from compressed air. It was also found that the capacity increases by about a factor of2 for a 30 °C lower temperature of the column from room temperature. In addition, all other parameters being the same the holding capacity of the charcoal before radon breaks through the column is found to be a function of the amount of charcoal. It was also found that the column may be regenerated by purging with CO^. These characteristics may be successfully utilized in the designing of alternative systems for radon removal from the compressed air.