Prompt neutron logging technology for uranium fission based on the ratio of epithermal neutrons to thermal neutrons

A technique of prompt neutron and thermal neutron, applied in the technical field of "uranium fission prompt neutron logging"

Active Publication Date: 2016-08-31
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

At present, there is no domestically produced instrument for uranium fission prompt neutron (or delayed neutron) logging, and the instrument products of the United States and European nuclear powers have been restricted from exporting to my country

Method used

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  • Prompt neutron logging technology for uranium fission based on the ratio of epithermal neutrons to thermal neutrons
  • Prompt neutron logging technology for uranium fission based on the ratio of epithermal neutrons to thermal neutrons
  • Prompt neutron logging technology for uranium fission based on the ratio of epithermal neutrons to thermal neutrons

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Embodiment Construction

[0049] The present invention will be described in more detail through the accompanying drawings and specific embodiments below.

[0050] The dual-neutron time spectrometer for uranium fission prompt neutron logging disclosed by the present invention includes a dual-neutron detector, a preamplifier, a shaping and discriminator, a time-spectrum analysis and buffer circuit, a detector high-voltage power supply circuit, a detector Tube low-voltage power supply circuit and other components. Its structure is as image 3 shown.

[0051] (1) Required for making well logging probe 3 He proportional counter tube and double neutron detector.

[0052] When the double neutron detector adopts the upper and lower structure (such as figure 1 shown), two cylindrical 3 He proportional counter tubes make double neutron detectors, and the distance between the detectors should be shortened as far as possible (so that the epithermal neutron attenuation N of the two detectors records E (t ≤20...

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Abstract

The invention discloses a uranium fission prompt neutron logging technology based on the ratio of epithermal neutrons to thermal neutrons. Specifically, it means that fast neutrons, also known as primary neutrons, are emitted to formation rocks in a pulsed manner in a borehole. Primary neutrons are successively moderated into epithermal neutrons and thermal neutrons by the medium in the well. Thermal neutrons induce 235U fission and emit uranium fission prompt neutrons, also known as secondary neutrons. The secondary neutrons are successively moderated into epithermal neutrons and thermal neutrons, and induce 235U fission again. At any time t after the primary neutrons are moderated into thermal neutrons, the total amount of epithermal neutrons nE(t) in the formation rock is proportional to the total amount of existing thermal neutrons nT(t) and the uranium content qu, that is, nE(t)∝nT(t)·qu. Using the dual neutron detector and dual time spectrometer disclosed in the invention, the time spectrum of epithermal neutrons and thermal neutrons is measured, and the epithermal neutrons from the time when primary neutrons are slowed down to thermal neutrons to any time are defined , The ratio of thermal neutron attenuation is the "E / T" ratio, and a real-time uranium quantification algorithm based on saturated ore bed is constructed.

Description

technical field [0001] The invention relates to a pulsed neutron well logging technology for uranium ore exploration drilling, and also a "uranium fission prompt neutron well logging" technology based on the ratio of epithermal neutrons to thermal neutrons. Background technique [0002] Nuclear logging is nuclear radiation measurement carried out in boreholes. It is a cutting-edge technology that has developed rapidly with the development of contemporary technology and its application in mineral (especially energy mineral) exploration. Nuclear logging is to use the radioactive rays that are naturally produced or artificially induced by formation rocks to study the distribution of rays along the axis of the borehole (well axis), and then determine whether certain nuclides (elements) are contained in the formation rocks, and determine a certain element content. A non-destructive detection method. Compared with nuclear radiation measurements carried out on the ground, many con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00G01V5/10
Inventor 汤彬王仁波周书民张雄杰王海涛陈锐刘志锋
Owner EAST CHINA UNIV OF TECH
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