Webin-initial background activity in mBq, τ-average 222 Rn half-life, S 0- 222 Rn recoil emanation per kg 222Rn activity from charcoal 222Rn activity from detector • Based on the measurements and the relationships posted above, it would require ~2.1 kg of Saratech charcoal to remove 222Rn from N 2 gas or 1.45 kg to remove 222Rn from Ar gas

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