Table 2.
Radon Concentration, surface exhalation rate and mass exhalation rate for wood species

Wood species	EPA Avg. in chamber(pCi/l)	Vacant chamber(pCi/l)	Concentration of emanation(pCi/l)	Surface exhalation rate(Bq·m-2·h-1)	Mass exhalation rate(Bq·kg-1·h-1)
Pinus densiflora Siebold. & Zucc.	0.3	0.2	0.1	0.00677	0.00089
Larix kaempferi (Lamb.) Carriere.	0.3	0.2	0.1	0.00711	0.00091
Chamaecyparis obtusa (Siebold. & Zucc.) Endl.	0.5	0.4	0.1	0.00677	0.00092
Quercus accutissima Carruth.	0.6	0.4	0.2	0.01517	0.00181
Quercus rubra L.	0.5	0.4	0.1	0.00774	0.00090