Patent ID: 6297507
Filing Date: 2001-10-02
Classification: G01V,H05H

Abstract:
A sealed tube neutron generator (.alpha.-STNG) incorporating an internal associated .alpha.-detector for well logging, comprising:a gas-tight envelope (1) that has a longitudinal axis; a Penning ion source (3); a gas supply (7B); an accelerating electrode (5); and a target (12), wherein said Penning ion source (3) and said accelerating electrode (5) are mounted in said gas-tight envelope (1) coaxially with said axis, said gas supply (7B) being fixed in a gas-supply chamber in said gas-tight envelope (1), said .alpha.-STNG further comprisinga cylindrical target chamber (10) having an upper header (10B) and a bottom header (10D) within which said target (12) is fixed in a central recess in the bottom header (10D);an ion leading out and focusing assembly (4) disposed between said Penning ion source (3) and said accelerating electrode (5);an ion beam drift tube (6) by which said gas-tight envelope (1) and said target chamber (10) are joined coaxially with said axis;a scintillation .alpha.-detector assembly (9) which comprises at least two individual small scintillation .alpha.-detectors surrounding said axis and mounted between the upper header (10B) and said target (12) in said target chamber (10); andan .alpha.-particle collimator (11) mounted between the .alpha.-detector assembly (9) and the target (12) in said target chamber (10).