G - Physics – 01 – V
Patent
G - Physics
01
V
358/1, 358/5
G01V 5/02 (2006.01)
Patent
CA 1190665
A B S T R A C T The invention relates to a method and apparatus for measuring at least one of the parameters flow rate, flow velocity, concentration and quantity of radon and/or radon daughters in the ground. The method is characterized by collecting gas arriving from the ground in a first chamber (12) which is gas-permeable at the bottom thereof, at least the downwardly extending boundaries (11) of the chamber being in contact with the ground, so that atmospheric gas is prevented from passing into the chamber. At least one detector (15) which measures alpha-radiation from the decomposition of radon and radon daughters is placed in a second chamber (16) communicating with the first chamber. Positioning of the second chamber and the detector is se- lected so that the detector can continuoulsy be observed and utilized for the measuring operation. The gas is allowed to pass continuously through the chambers (12, 16) over a given period of time, to expose the detector to the gas. Subsequent to this exposure, the measuring result registered on the detector is evaluated. The method can be modified for measuring radon departure from the surface of the ground, the gas-permeable first chamber being arranged over the surface of the ground to be analyzed. The detector is placed in a second chamber (16) communicating with the first chamber. For the purpose of measuring the flow rate and velocity of radon passing through the ground there is provided a first chamber (12) beneath the level of the ground, at a desired depth. This first chamber is connected with a gas-impermeable passage (13) to a second chamber (16) which can be readily reached from the level of the ground and which is sealed against penetration of atmospheric air. The detector (15) is placed in the second chamber (16).
387174
Kristiansson Krister
Malmqvist Erik L.
Boliden Aktiebolag
Gowling Lafleur Henderson Llp
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