89results about "Material analysis using neutrons" patented technology

Provided is an inspection robot that is self-propelled on piping, measures moisture contained in a lagging material using a mounted inspection device, for example, a neutron moisture meter, and detects risk of corrosion. The inspection robot includes a main frame 1 including a recessed part 17 fit onto an outer circumferential surface of piping P, a main frame drive mechanism (first drive mechanism) D1 that causes the main frame to advance/retract in an axis direction of the piping, a revolving member 32 supported in an advanceable/retractable manner along an arc-shaped locus in the recessed part of the main frame, a revolving member drive mechanism (second drive mechanism) D2 that moves the revolving member, and an inspection device mounted on the revolving member.

In one example, a radiation source comprises a housing and an acceleration chamber within the housing, with a peak acceleration energy greater than the lowest neutron production threshold of tantalum. A source of charged particles is supported by the housing to emit charged particles into the acceleration chamber. A target is supported by the housing downstream of the acceleration chamber. The target consists essentially of at least one isotope having a neutron production threshold greater than the peak acceleration energy. No neutrons are therefore generated. The source may also comprise a collimator, target shielding, and/or housing shielding comprising at least one isotope having a neutron production threshold greater than the peak acceleration energy, reducing or eliminating neutron generation as compared to the prior art, as well. Systems comprising the source, methods of operation of the source, and methods of manufacture of the source are also disclosed.

A neutron imaging system detects both the phase shift and absorption of neutrons passing through an object. The neutron imaging system is based on either of two different neutron wavefront sensor techniques: 2-D shearing interferometry and Hartmann wavefront sensing. Both approaches measure an entire two-dimensional neutron complex field, including its amplitude and phase. Each measures the full-field, two-dimensional phase gradients and, concomitantly, the two-dimensional amplitude mapping, requiring only a single measurement.

A method for correcting data collected with a neutron emitting instrument, includes: obtaining characterization data for the instrument, the characterization data including inelastic background data of the instrument; and correcting the collected data according to the characterization data. A computer program product and an instrument are provided.

A method and apparatus for inspecting an object is present. Radiation is emitted from a radiation source. A beam is formed from a portion of the radiation emitted by the radiation source using a collimator. The collimator is connected to the radiation source by a bearing system comprising a first structure associated with the radiation source and a second structure connected to the first structure. The second structure is configured to hold the collimator. The second structure of the bearing system is moved using a movement system such that the second structure rotates in one of a plurality of directions substantially about a center point in the radiation source while the radiation source remains stationary relative to the second structure. Rotation of the second structure substantially about the center point in the radiation source changes a direction in which the beam is directed.

The present invention relates to the technical field of neutron reflection, particularly to a neutron reflection spectrometer optical path structure capable of performing rapid switching between a polarization mode and a non-polarization mode. The optical path structure mainly comprises an incident arm, a sample table and a reflection arm, wherein the incident arm comprises a first slit, a second slit, a third slit, a focusing conduction pipe, a polarizer, a first translation table, a second translation table, a first platform, a second platform and an incident arm base, the sample table comprises a vertical electromagnet, a sample, a cryostat, a third platform, a sample attitude adjustment mechanism and a sample table base, and the reflection arm comprises a fourth slit, a lifting table, a polarization analyzer, a detector, a third translation table, a reflection arm base, a fourth platform and a reflection arm rotation drive mechanism. According to the present invention, the rapid switching between the polarization mode and the non-polarization mode can be achieved by simply controlling and adjusting the movements of the three translation tables and the lifting table, such that the structure is easily achieved, and the precision of the experiment is high.

A cosmogenic neutron sensor includes a hydrogen-sensitive neutron detector orientable above a measurement surface. A neutron shield is positionable on the hydrogen-sensitive neutron detector. The neutron shield is positioned to interact with at least a portion of cosmogenic neutrons propagating in a direction of the hydrogen-sensitive neutron detector.

The invention discloses a tight sandstone anhydrous gas reservoir gas-bearing capacity evaluation method, and solves the technical problem of low tight sandstone anhydrous gas reservoir gas-bearing capacity evaluation precision in the prior art. The method mainly comprises the following steps: sequentially calculating a shale content curve Vsh, an effective porosity curve phi e, a pure rock neutron curve CNL1, an apparent sandstone skeleton hydrogen content index curve CNL2 and a gas content evaluation index parameter GASFG curve, and finally carrying out gas content evaluation according to the gas content evaluation index parameter GASFG curve. According to the method, the excavation effect of the natural gas on the neutron logging curve is fully utilized to quantitatively characterize the gas-bearing index parameters, and the technical problem in the prior art that the tight sandstone anhydrous gas reservoir is difficult to accurately evaluate the gas-bearing property of the reservoir under the condition that stratum water and other data are lacked is effectively solved through classification evaluation. Practice proves that the technology not only can accurately evaluate the gasbearing capacity of the tight sandstone anhydrous gas reservoir, but also can effectively identify the high gamma reservoir, so that an accurate exploration method is provided for oil and gas exploration.

The invention discloses a method for detecting the hollow depth of concrete under a steel shell. The method comprises the steps as follows: step 1, establishing a hollow depth calibration curve library: by changing hollow depth 1 between a steel plate and a concrete simulation standard block, thickness h of the steel plate and water content omega of the concrete simulation standard block, calibrating the hollow depth 1 by a thermal neutron detector to obtain the hollow depth calibration curve library, wherein the hollow depth calibration curve library comprises multiple hollow depth calibration curve units with different water contents, and each hollow depth calibration curve unit comprises three hollow calibration curves with different steel plate thicknesses; step 2, arranging detectionpoints; step 3, selecting and determining hollow depth calibration curves; step 4, measuring and determining the hollow depth. The hollow depth calibration curves are established, effects of water content of concrete on the hollow depth are fully considered, and different calibration curves are adopted for different steel plate thicknesses and water content of concrete, so that the detection of the hollow depth is more accurate and rapid.

The invention discloses a method for quickly identifying the mineral volume content of a shale formation, which comprises the following steps: 1. Obtaining the mineral content of the target shale formation; 2. Establishing a volume model of the target shale formation and constructing the described The logging response equation of the objective shale formation under different volume content parameters, and determine the error and measurement error of the logging response equation; 3. Based on the actual logging curve, logging response equation, error and measurement error of the response equation, establish a log The objective function of well interpretation; 4. Obtain the optimal volume content parameter corresponding to the minimum value, and draw the logging response forward modeling result curve and the confidence interval of the forward modeling curve corresponding to the optimal volume content parameter; 5. Check the measured Whether the well response forward modeling result curve matches the actual logging curve, the mineral volume content in the volume content parameter corresponding to the matching forward modeling result curve is taken as the determination result.

Embodiments of the present invention disclose a nuclide identification method, a nuclide identification system, and a photoneutron emitter. The photoneutron emitter comprises: a pulsed electron accelerator configured for emitting electrons; and a photoneutron converting target configured to receive the electrons emitted by the pulsed electron accelerator and convert the electrons into photoneutrons. The photoneutron converting target has a volume of about 100 to about 8000 cm3, of about 100 to about 2500 cm3, or of about 785 cm3. These embodiments of the present invention can improve an accuracy of identification of a nuclide, and provide a practical photoneutron emitter, method and system for identifying a nuclide. Especially, these embodiments of the present invention can improve an accuracy of identification of a fissile nuclide such as 233U, 235U, and 239Pu, and provide a practical photoneutron emitter, method and system for identifying a fissile nuclide such as 233U, 235U, and 239Pu.