Abstract: An x-ray based cement evaluation tool for measurement of the density of material volumes within single, dual and multiple-casing wellbore environments is provided, the tool including at least an internal length comprising a sonde section, wherein said sonde section further comprises an x-ray source; a radiation shield for radiation measuring detectors; sonde-dependent electronics; and a plurality of tool logic electronics and PSUs, wherein the tool uses x-rays to illuminate the formation surrounding a borehole and a plurality of detectors are used to directly measure the density of the cement annuli and any variations in density within. Detectors used to measure casing standoff such that other detector responses are compensated for tool stand-off and centralization; a plurality of reference detectors is used to monitor the output of the x-ray source, and a shortest-axial offset detector is configured to distribute incoming photons into energy classifications such that photoelectric measurements may be made.

Abstract: An x-ray based cement evaluation tool for measurement of the density of material volumes within single, dual and multiple-casing wellbore environments is provided, wherein the tool uses x-rays to illuminate the formation surrounding a borehole, and a plurality of detectors are used to directly measure the density of the cement annuli and any variations in density within The tool uses x-rays to illuminate the casing surrounding a borehole and a plurality of multi-pixel imaging detectors directly measure the thickness of the casing The tool includes an internal length having a sonde section, wherein the sonde section further includes an x-ray source; a radiation shield for radiation measuring detectors; sonde-dependent electronics; and a plurality of tool logic electronics and PSUs. Other systems and subsystems appropriate for carrying out the foregoing are also disclosed, as are a plurality of example methods of use therefor.

Abstract: A detection apparatus (D) for photons or ionizing particles (P) is described, in which a detector system (11) is provided with several detecting units (11a), each including a scintillator (112) connected to a reader surface (111a) on an electronic charge reader (111), the scintillator (112) being arranged to generate cellular charges on the reader surface (111a) when capturing the photons or the ionizing particles (P), there being a collimator (113) arranged, connected to the scintillator (112) opposite the electronic charge reader (111), the collimator (113) being arranged to capture photons or ionizing particles (P?) exhibiting a direction of motion coinciding with a longitudinal axis (A) of the collimator (113), and to reject photons or ionizing particles (P?) exhibiting a direction of motion deviating from the direction of the longitudinal axis (A) of the collimator (113).