Abstract: Devices may include a scintillation detection device including a scintillator, a photon detector at least partially enclosed by the scintillator, and at least one reflector at least partially enclosing the scintillator. In another aspect, an oilfield wellbore device may include an oilfield string with at least one scintillation detection device on the string and a pressure housing enclosing the one or more scintillation detection devices. In another aspect, a method of measuring radiation in an oil and gas well may include conveying at least one scintillation detection device to at least one zone of interest in the oil and gas well and recording data from at least one scintillation detection device as a function of location in the well.

Abstract: Devices may include a scintillation detection device including a scintillator, a photon detector at least partially enclosed by the scintillator, and at least one reflector at least partially enclosing the scintillator. In another aspect, an oilfield wellbore device may include an oilfield string with at least one scintillation detection device on the string and a pressure housing enclosing the one or more scintillation detection devices. In another aspect, a method of measuring radiation in an oil and gas well may include conveying at least one scintillation detection device to at least one zone of interest in the oil and gas well and recording data from at least one scintillation detection device as a function of location in the well.

Abstract: Borehole logging tools and systems that include a scintillator positioned to interact with scattered source neutrons that are received from a target formation. The scintillator emits luminescence in response to interaction with the scattered neutrons. The scintillator includes an aluminofluoride host material (e.g., LiCAF). In a specific embodiment, the aluminofluoride host material is doped with europium. In a further specific embodiment, a processor distinguishes scattered neutrons from gamma rays based upon identifying a peak within an output signal from the scintillator. In yet another specific embodiment, a system includes a first scintillator and a second scintillator. The processor subtracts luminescence generated by the second scintillator from luminescence generated by the first scintillator to identify a neutron response of the first scintillator.

Abstract: A combined thermal neutron and epithermal neutron radiation detector includes a plurality of neutron detecting elements arranged such that a first set of the detecting elements is disposed closer to a source of neutron flux scatted from a material or formation to be analyzed than a second set of detecting elements. The neutron detecting elements have a material therein susceptible to capture of thermal neutrons for detection. Signal outputs of the first set of are interconnected and signal outputs of the second set are separately interconnected to provide a signal output corresponding to each of thermal neutron flux and epithermal neutron flux entering the detector.

Abstract: A surface contamination monitoring system/method configured to correct the detected the radioactive net count rate (NCR) value of a whole-body surface contamination monitoring device based on monitored subject height and thickness is disclosed. The system includes a height detection means for determining the height of a monitored subject and a thickness detection means for determining the thickness of at least a portion of the monitored subject. The net count rate (NCR) is corrected based on the determined height and thickness of the monitored subject as applied to site calibration factor data and self-shielding factor data to produce a corrected net count rate (CNR). If the corrected net count rate (CNR) registers above a preset alarm threshold, the monitored subject is considered contaminated and an appropriate alarm is registered.

Abstract: Embodiments described herein are directed to methods and neutron detectors for use in downhole and other oilfield applications. In particular, the neutron detector includes a scintillator formed at least partially from an elpasolite material. In a more specific embodiment, the scintillator is formed from a Cs2LiYCl6 (“CLYC”) material.

Abstract: A system and method for correcting, based on a monitored subject's height and thickness, the net count rate value of a whole-body surface contamination monitoring device. The device includes a height detection means for determining the height of a subject being monitored, and a thickness detection means for determining the thickness of at least a portion of the body of the subject being monitored. The net count rate is based on site calibration factor data and self-shielding factor data, wherein both types of factor data consider the determined height and thickness.

Abstract: Borehole logging tools and systems that include a scintillator positioned to interact with scattered source neutrons that are received from a target formation. The scintillator emits luminescence in response to interaction with the scattered neutrons. The scintillator includes an aluminofluoride host material (e.g., LiCAF). In a specific embodiment, the aluminofluoride host material is doped with europium. In a further specific embodiment, a processor distinguishes scattered neutrons from gamma rays based upon identifying a peak within an output signal from the scintillator. In yet another specific embodiment, a system includes a first scintillator and a second scintillator. The processor subtracts luminescence generated by the second scintillator from luminescence generated by the first scintillator to identify a neutron response of the first scintillator.

Abstract: A surface contamination monitoring system/method configured to correct the detected the radioactive net count rate (NCR) value of a whole-body surface contamination monitoring device based on monitored subject height and thickness is disclosed. The system includes a height detection means for determining the height of a monitored subject and a thickness detection means for determining the thickness of at least a portion of the monitored subject. The net count rate (NCR) is corrected based on the determined height and thickness of the monitored subject as applied to site calibration factor data and self-shielding factor data to produce a corrected net count rate (CNR). If the corrected net count rate (CNR) registers above a preset alarm threshold, the monitored subject is considered contaminated and an appropriate alarm is registered.

Abstract: A system and method for correcting, based on a monitored subject's height and thickness, the net count rate value of a whole-body surface contamination monitoring device. The device includes a height detection means for determining the height of a subject being monitored, and a thickness detection means for determining the thickness of at least a portion of the body of the subject being monitored. The net count rate is based on site calibration factor data and self-shielding factor data, wherein both types of factor data consider the determined height and thickness.