LaBr3(Ce) crystal-based multi-channel gamma energy spectrum logging instrument
A gamma energy spectrum and logging tool technology, which is applied in the field of 1024-channel gamma energy spectrum logging tools, can solve the problems of inability to accurately interpret the nuclide content and the difficulty of drilling fine gamma energy spectrum, and achieve shortened dead time and high pulse rate. Sampling rate, good stability
Active Publication Date: 2014-01-08
EAST CHINA UNIV OF TECH
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Problems solved by technology
This series of factors has brought great difficulties to obtain the fine gamma energy spectrum of the borehole
Spectral logging tools that usually use crystal detectors such as NaI(Tl), CsI, and BGO cannot effectively overcome the above-mentioned difficulties and obtain fine γ-spectrum information of the formation due to the limitations of detector energy resolution and detection efficiency. Accurately interpret the content of uranium, thorium, potassium and other nuclides in the formation
Method used
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Embodiment 1
[0024] The gamma energy spectrum logging tool proposed by the present invention includes a probe pipe, an operating table, a cable and a drawworks. The probe part includes LaBr3 (Ce) crystal, photomultiplier tube, spectrometer amplifier, peak hold circuit, pulse amplitude analyzer, 485 communication interface, high and low voltage power supply, etc.; the console part consists of 485 communication interface, power conversion and notebook computer, etc. constitute. The winch is an electric or manual logging winch, and the cable is a multi-core logging cable with a maximum length of 3 kilometers. structured as figure 1 .
[0025] (1) Using LaBr 3 (Ce) combined with photomultiplier tube to form LaBr 3 (Ce) crystal gamma ray detector:
[0026] Using the latest LaBr 3 (Ce) crystal γ-ray detector, which has better comprehensive performance, specifically: the detector has a wider energy response range, a wider energy linear range, especially for medium and high energy γ-rays. D...
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The invention relates to a LaBr3(Ce) crystal-based multi-channel gamma energy spectrum logging instrument. The instrument comprises a probe part, an operating platform, a cable and a winch, wherein the probe part comprises a LaBr3(Ce) crystal gamma ray detector formed by combining LaBr3(Ce) and a photomultiplier, a spectroscope amplifier, a peak holding circuit, a pulse amplitude analyzer and a high and low voltage power supply; the operating platform comprises a power supply converter and a computer; and the spectroscope amplifier receives a pulse signal from the detector, the pulse signal is input into the pulse amplitude analyzer through the peak holding circuit after passing through the spectroscope amplifier, and digital information output by the pulse amplitude analyzer is connected with a 485 communication interface of the computer through a 485 communication interface of the probe, and the cable. The logging instrument can directly measure the characteristic energy spectra of various radionuclides such as a uranium family, a thorium family, potassium and the like in nuclear resource logging, and has the characteristics of high energy resolution, measuring efficiency and stability, and the like.
Description
technical field [0001] The present invention relates to a kind of based on LaBr 3 (Ce) crystal multi-channel gamma energy spectrum logging tool, specifically refers to a kind of based on LaBr 3 The 1024-channel gamma spectrum logging tool of the (Ce) crystal detector is applied to the uranium ore gamma logging, which can directly obtain the fine gamma spectrum data of the formation and interpret the corresponding uranium ore layer content. Background technique [0002] Nuclear logging technology is one of the cutting-edge technologies developed rapidly with the development of contemporary technology and its application in the exploration of uranium, thorium, oil and gas, coal and other minerals. It uses the γ-rays naturally produced (or artificially stimulated and artificially activated) in the formation rocks to study the distribution of the rays along the well axis, and then determine whether the formation rocks contain certain nuclides (elements) and determine their cont...
Claims
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IPC IPC(8): E21B47/00E21B49/00G01V5/12
Inventor 汤彬王仁波吴永鹏
Owner EAST CHINA UNIV OF TECH