Question

1.0 microCi of radon gas is released into a room that has dimensions 12 ft. x 12 ft. x 8 ft. Calculate the concentration of Rn, in pCi/L and Bq/m3

Answer 1

1 Ci = 3.7x10¹⁰ Bq

1 microcurie = 3.7x10⁴ = 37000 Bq

1 m = 3.28 ft

Conversion of feet to meters

12/3.28 =3.65 m

8/3.28 = 2.43m

Area of the room = 3.65m x 3.65m x 2.43m = 32.37 m³

Conncentration of radon gas = 37000 Bq/ 32.37 m³ = 1143 Bq/m³

Concentration of radon gas in pCi/L

1 microcurie = 3.7x10⁴ = 37000 Bq

1 pCi = 0.0.37 Bq

37000 Bq = 10⁶ pCI

1 m³ = 1000 L

32.37 m³ = 32.37 x 1000 = 32.37x10³ L

Conc. of radon gas = 10⁶ pCi / 32.37x10³ L = 1000/32.37 = 30.89 pCi/L