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| Number | Title | Issue Date |
| 7313221 | Radiographic equipment The invention concerns radiographic equipment. The equipment includes a source of substantially mono-energetic fast neutrons produced via the deuterium-tritium or deuterium-deuterium fusion reactions, comprising a sealed-tube or similar generator for producing the n... | 12/25/2007 |
| 4808368 | High voltage supply for neutron tubes in well logging applications A high voltage supply is provided for a neutron tube used in well logging. The "biased pulse" supply of the invention combines DC and "full pulse" techniques and produces a target voltage comprising a substantial negative DC bias component on which is sup... | 02/28/1989 |
| 4311912 | Neutron accelerator tube having improved target section A neutron accelerator tube having a replenisher section for supplying accelerator gas, in ionization section adjacent the replenisher section adapted to receive the accelerator gas, and a target section adjacent the ionization section. The target section ... | 01/19/1982 |
| 4119858 | Compact long-lived neutron source A compact apparatus with long lifetime for producing high-energy neutrons is described which is suitable for application to neutron well-logging and to activation analysis. It embodies a tritiated target bombarded by a beam of energetic deuterium ions, th... | 10/10/1978 |
| 4093854 | Well logging sonde including a linear particle accelerator In accordance with an illustrative embodiment of the present invention, a logging sonde includes a standing wave type microwave linear particle accelerator excited by a magnetron and producing bursts of high energy electrons which can selectively bombard ... | 06/06/1978 |
| 4092545 | Means and method for controlling the neutron output of a neutron generator tube Means and method for energizing and regulating a neutron generator tube having a target, an ion source and a replenisher includes providing a negative high voltage to the target and monitoring the target current. A constant current from a constant current... | 05/30/1978 |
| 4051368 | Method of measuring horizontal flow speed of fluids in earth formations penetrated by a wellborehole The horizontal flow rate of fluid in permeable earth formations is measured by the in situ creation of a radioactive tracer isotope having a predetermined decay life time and decay mode. Measurements at different time intervals following the creation of t... | 09/27/1977 |
| 4028546 | Behind well casing water flow detection system Equipment for the detection of undesired behind casing water flow in a producing well is provided. A well logging sonde having a modular fluid tight structure is disclosed. Basically, three modules which when joined together form a fluid tight assemblage ... | 06/07/1977 |
| 3949232 | High-voltage arc detector A well-logging sonde employes a neutron generator. It has a high-voltage supply for the target of the neutron generator tube. The sonde includes an insulated high-voltage conductor for connecting the supply to target, and there is a metallic ring supporte... | 04/06/1976 |
