Low radioactive nucleon density measurer

A technology for measuring instruments and density values, which is applied in the directions of radiation intensity measurement, X-ray energy spectrum distribution measurement, and measuring devices, and can solve the problem of low radioactivity of gamma-ray sources

Inactive Publication Date: 2003-07-23
TROXLER ELECTRONICS LAB INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although the gamma-ray source in these gauges is very low in radioactivity, in the millicurium range, and it can be used safely by operators with ordinary precautions and safeguards, regulatory agencies still have restrictions on the maintenance, transportation, storage, and use of such gauges. instruments and restrictions on qualified personnel operating such instruments

Method used

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Embodiment Construction

[0016] The invention will be described more fully hereinafter with reference to the accompanying drawings, which show preferred embodiments of the invention. The invention may, however, be carried out in many different ways and should not be limited to the embodiments described herein; rather, these embodiments are provided so that this description will be thorough and complete, and will convey to those skilled in the art fully illustrate the scope of the invention. Like reference numerals refer to like parts throughout the drawings.

[0017] principle

[0018] The invention is based on the property of matter to scatter and absorb gamma rays. For gamma rays with energies below 2 MeV, there are two main mechanisms by which matter interacts. In the energy range of 0.1 to 0.2 MeV, the main mechanism of action is inelastic scattering (Compton scattering). For energies below 0.1 MeV, the main mechanism of action is photoelectric absorption. In the 0.1 to 0.2 MeV energy range, ...

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Abstract

A nuclear density gauge and test method is provided for measuring density material in a relatively thin zone beneath a surface of the material. The gauge comprises a gauge housing and a substantially planar base on said gauge housing adapted to be positioned on a surface of the material sample. A gamma radiation source having a characteristic primary energy and an activity of no more than 100 microcurie is mounted within the housing and cooperates with the base for emitting gamma radiation through the base and into an underlying material sample. An energy selective gamma radiation detector is mounted within the gauge housing and in laterally spaced apart relation from the gamma radiation source. The gamma radiation detector is operable for quantifying the energy level of the detected gamma radiation. Shielding is provided within the gauge housing between the source and the detector for preventing gamma radiation from passing directly from said source to the detector. An analyzer is connected to the detector for detecting gamma radiation counts in a predetermined energy spectrum having a lower limit of 0.1 MeV or greater and an upper limit which is less than the characteristic primary energy of said source. The density of the sample is calculated based upon the gamma radiation counts obtainedby the analyzer within the predetermined energy spectrum.

Description

technical field [0001] The present invention relates to the measurement of density, and more specifically, the present invention relates to a test instrument and a test method for measuring the density of a sample by gamma rays. The invention is particularly suitable for measuring the density of thinner zone layers located below the sample surface. Background technique [0002] In the asphalt paving industry, the density of asphalt pavements is often measured using a portable nuclear gauge. Typically, asphalt pavers are laid in relatively thin layers, for example on the order of about 1 to 2 inches in thickness, on a prepared road bed or on an existing paved surface. Therefore, there is a need to measure the density of pavement samples in thinner zones below the pavement surface, for example, at a depth of 1 to 3 inches. To this end, nuclear gauges have been developed for directly measuring the density of thin-layer paving materials. Nuclear "thin layer" gauges of this ty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/203G01N23/06G01T1/36
CPCG01N23/06
Inventor 罗伯特·E·特罗克斯乐W·莱纳斯·德普
Owner TROXLER ELECTRONICS LAB INC
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