G - Physics – 01 – V
Patent
G - Physics
01
V
G01V 5/02 (2006.01) G01N 23/08 (2006.01) G01W 1/14 (2006.01)
Patent
CA 2573711
This new device named GMON is a Gamma MONitor that measures and reports four times a day on the snow water equivalent (SWE) and soil moisture (SM) content of a selected area. The GMON device is installed well above the maximum snow-pack thickness and measures the absorption of the natural gamma radiation through the snow cover. The sensor element is a conventional thallium doped sodium iodide scintillator NaI(Tl) coupled to custom electronics that record and analyze the gamma ray energy spectra. A numerical signal processor, enclosed within the GMON, proceeds to the analysis and the accurate calculations of SWE and SM. These calculations are based on the absorption by the snow cover of the gamma rays emitted by the naturally radioactive elements present in the ground (40K, 208Tl, etc.). The upper limit of the gamma spectrum considered for the analysis is 3 million-electron-volts (3 MeV). Information on the SWE of the snow pack is essential to agencies involved in water management, such as Hydro-Québec. Typically, in Quebec, the snow pack cumulated at the end of winter represents annually some 30% of the total available hydraulic energy. It is also important to detect when the snow-pack begin to melt, and from there on, measure the melting rate. Those data are also of significant importance for civil safety (early flood warnings).
Choquette Yves
Ducharme Pierre
Houdayer Alain
Lavigne Pierre
Martin Jean-Pierre
Choquette Yves
Ducharme Pierre
Houdayer Alain
Hydro Quebec
Lavigne Pierre
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