CPC G01V 5/005 (2013.01) [G01T 1/20 (2013.01); G01V 5/04 (2013.01); H01J 47/008 (2013.01)] | 14 Claims |
1. A borehole muon detector for muon radiography or geotomography, the borehole muon detector including a substantially cylindrical housing, which defines a bore, a pair of end caps, each end cap sealing an end of the cylindrical housing and a plurality of sealed drift tubes which are longitudinally disposed in the bore of the housing to form a bundle of drift tubes, wherein each sealed drift tube comprises: a centrally located anode wire disposed on a longitudinal axis; an inner surface which is coated with a cathode coating, the cathode coating divided into at least first cathode pad and a second cathode pad by a Vernier pattern; and a printed circuit board in electrical communication with the anode wire for measuring a current.
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