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Natural gamma-ray spectral logging instrument and operating method thereof

A technology of natural gamma energy spectrum and logging tool, which is applied in the field of radioactivity measurement equipment, can solve the problems of insufficient utilization of information, etc., and achieve the effects of light weight, high sensitivity and good mechanical strength

Active Publication Date: 2015-09-02
上海新漫传感科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Natural gamma ray logging can only reflect the total effect of all radionuclides in the formation, and the information provided by the formation has not been fully utilized

Method used

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  • Natural gamma-ray spectral logging instrument and operating method thereof
  • Natural gamma-ray spectral logging instrument and operating method thereof
  • Natural gamma-ray spectral logging instrument and operating method thereof

Examples

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Embodiment 1

[0077] In this embodiment, the detection element 13 is a BGO crystal, Φ25×40mm, the photomultiplier tube 15 is Hamamatsu R6094 photomultiplier tube, and the spectrum-stabilizing substance 121 is analytically pure potassium carbonate, with a mass of 20g, pressed into Φ25×25mm, placed in housing 120. When the spectrum is stable, the energy spectrum acquisition time t c for 300s, E c is 1.46MeV ( 40The characteristic peak of K), looking for the peak position C of potassium p , to perform energy calibration on the spectrometer.

[0078] Compared with sodium iodide crystals commonly used in energy spectrometers, bismuth germanate crystals (BGO) have a large atomic number (effective atomic number 74) and a high density (7.13g cm -3 ), the BGO crystals of the same size have an all-energy peak efficiency of γ-rays more than three times that of sodium iodide crystals. BGO crystals do not deliquesce, have stable chemical properties, good mechanical strength, and do not require mois...

Embodiment 2

[0081] In this embodiment, the detection element 13 is LaBr 3 (Ce) crystal, Φ25×40mm, photomultiplier tube 15 is ET9125B photomultiplier tube. When the spectrum is stable, the energy spectrum acquisition time t c 120s, E c is 2.62MeV ( 232 The characteristic peak of Th), looking for the peak position of thorium C p , to perform energy calibration on the spectrometer.

[0082] LaBr 3 (Ce) crystals have the characteristics of large atomic number, high density, good energy resolution (about 3% for 662 keV), high light output, and small temperature coefficient. Using LaBr 3 The detector made of (Ce) crystal has high sensitivity, good resolution and small temperature coefficient. Compared to sodium iodide crystals, LaBr 3 (Ce) crystal is more suitable for energy spectrum measurement, especially the application of gamma ray spectrum logging.

[0083] According to the above-mentioned design plan, a corresponding natural gamma ray spectrum logging tool is formed, which has hi...

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Abstract

The invention discloses a natural gamma-ray spectral logging instrument, which comprises a probe, an operating platform and a winch cable, wherein the probe is connected and communicates with the operating platform through the winch cable, and the probe comprises a detector and an electronics system; the detector comprises a spectrum stabilization device, a detecting element, a photoconductive element, a photomultiplier and a pre-amplification circuit; the electronics system inside the probe comprises an amplifier, a multichannel analyzer, a controller, a memory, a high-voltage power supply and a low-voltage power supply; the detecting element is one of a BGO crystal or a LaBr3 (Ce) crystal; the spectrum stabilization device comprises a shell body and a spectrum stabilization substance arranged in the shell body; and the spectrum stabilization substance is pressed into a pie shape and arranged in the shell body. The natural gamma-ray spectral logging instrument provided by the invention adopts the BGO or LaBr3 (Ce) crystal detector, is high in sensitivity, has good resolution, is internally provided with the natural substance for automatic spectrum stabilization, is convenient to use, and mainly measures gross-count rate caused by natural radioactivity in underground rock and contents and distribution data of natural uranium, thorium and potassium.

Description

technical field [0001] The invention relates to the field of radioactive measuring equipment, in particular to a natural gamma energy spectrum logging instrument for measuring the contents of uranium, thorium and potassium in rocks and a working method thereof. Background technique [0002] Natural gamma ray logging is a logging method that measures the natural gamma ray intensity of rock formations in wells to study geological problems. Rocks generally contain varying amounts of radioactive elements and emit radiation continuously. Using these laws, it is possible to divide the geological section of the borehole, determine the shale content of the sandstone in the sandstone section and judge the permeability of the rock qualitatively according to the natural gamma ray logging results. [0003] An immediate use of gamma ray logging is to find radioactive minerals (uranium, thorium, etc.), as well as other minerals that are radioactive, such as potassium salts. [0004] Nat...

Claims

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Application Information

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IPC IPC(8): G01V5/06G01V5/12G01T1/36
Inventor 赵文渊张燊孙刚高超吴小明严小华张国胜
Owner 上海新漫传感科技有限公司
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