Single Rod Low Activity Nucleon Moisture Density Meter

Abstract

The invention discloses a single-pole low-activity nucleon moisture density instrument. The single-pole low-activity nucleon moisture density instrument comprises a shell, a gamma source, a density collection unit, a neutron source, a moisture collection unit and a data processing unit, wherein the density collection unit comprises a gamma probe, a gamma channel secondary high-speed amplification screening circuit and a gamma channel high-speed pulse counting circuit, which are connected in sequence; the moisture collection unit comprises a neutron probe, a neutron channel secondary high-speed amplification screening circuit and a neutron channel high-speed pulse counting circuit, which are connected in sequence; the data processing unit comprises a central processing module, an operation panel and a display module; the operation panel and the display module are respectively connected with the central processing module; the shell is provided with a sleeve; the sleeve is internally provided with a sliding rod; the gamma source is arranged at the bottom end of a slide rod; the gamma channel high-speed pulse counting circuit and the neutron channel high-speed pulse counting circuit are respectively connected with an input end of the central processing module. The single-pole low-activity nucleon moisture density instrument disclosed by the invention is high in detection speed and high in detection precision, and particularly has the advantages of low radioactive source activity and large detection depth.

Description

technical field [0001] The invention relates to the field of foundation construction quality detection instruments, in particular to a single-rod low-activity nuclear moisture density meter. Background technique [0002] The moisture density (also known as compaction) test of bulk materials such as foundations is a test item that must be carried out in transportation, water conservancy and hydropower, and municipal construction. All ministries and commissions of the country clearly stipulate that this item must be carried out when formulating corresponding ministerial specifications. test. [0003] At present, the methods used in the detection of moisture density of bulk materials such as foundations include sand filling method, ring knife method, core drilling method and nuclear method. Among them, the nuclear method uses micro-rays as probes to detect foundation density and moisture through high-sensitivity detection and microprocessor analysis and calculation. Its main a...

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Problems solved by technology

However, the detection depth of the nuclear density moisture meter of the prior art is 30cm. If it is necessary to detect the foundation density and moisture below the depth of 30cm, one way is to use the double-rod technology, that is, the radioactive source and the probe are inserted into the foundation simultaneously, but this The method is very inconvenient to use on site and almost no one uses it on the construction site. Another method is to use single-rod technology, but the activity of the radioactive source must be increased, because the radiation of the radioactive source is harmful to the human body. The radioactive source activity of the instrumentation of the method is specified to enforce the standard

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