Method for measuring non-calibrating neutron water content

A measurement method, calibration-free technology, applied in the use of radiation for material analysis, special data processing applications, instruments, etc.

Inactive Publication Date: 2006-05-17
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the composition of the material changes in this measurement method,...

Method used

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  • Method for measuring non-calibrating neutron water content
  • Method for measuring non-calibrating neutron water content
  • Method for measuring non-calibrating neutron water content

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Embodiment Construction

[0016] The method of the calibration-free neutron moisture meter of the present invention is: using fast neutrons and gamma rays to simultaneously detect the moisture and bulk density of materials on the conveyor belt. When the composition of the material changes, the moisture meter does not need to be re-calibrated. Fast neutron transmission is used to measure material moisture, and γ-ray transmission is used to measure bulk density. The purpose of measuring bulk density is to compensate the change of moisture measurement value caused by the change of material accumulation shape.

[0017] The invention adopts a fast neutron source (Am-Be or Pu-Be) and a fast neutron detector, and uses a ZnS(Ag)+GDB photomultiplier tube. The γ-ray test uses a γ-ray source (Cs-137) and a γ-ray detector NaI (Tl) or BGO+GDB photomultiplier tube. The profile of the neutron source of described fast neutron source (Am-Be or Pu-Be) is cylindrical, and diameter is 17.4mm, and height is 19.2mm, and ac...

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Abstract

The present invention relates to a calibration-free fast-neutron water content measuring method. Said method utilizes fast-neutron and gamma-ray to simultaneously on-line detect water content and bulk density of material on the conveyer band. The bulk density measurement adopts gamma-ray transmission method, the parameter for measuring bulk density can be used to make correction of water content value measurement. Said invention also provides the concrete steps of said measuring method and its application range.

Description

technical field [0001] The invention relates to a neutron moisture measurement method, in particular to a calibration-free neutron moisture measurement method. Background technique [0002] Neutron moisture measurement is a commonly used method, but the existing neutron moisture measurement needs to be calibrated frequently, which is not convenient enough in use. [0003] Such as CN00107525.X is a kind of nuclear moisture density measuring instrument, including housing, display, emission source, detector, display is installed on the surface of the housing, emission source, detector are located in the housing, radiation source includes gamma source and neutral The gamma source is located in the lower end of the source rod, and the lower end extends into the lead package, the neutron source is also located in the lead package, and the lead package is located in the bottom frame of the shell. The slider that slides horizontally has a slope on the sid...

Claims

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Application Information

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IPC IPC(8): G01N23/09G01N23/06G06F19/00
Inventor 刘圣康
Owner NANJING UNIV
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