Dual-detector segmenting gamma-scanning measuring device and scanning method thereof

Abstract

The invention relates to a dual-detector segmenting gamma-scanning measuring device based on equivalent radius correction, belonging to the technical field of nuclear radiation measurement. The dual-detector segmenting gamma-scanning measuring device comprises a rotary table, a detector platform assembly, a transmission source platform assembly, a platform lifting and driving assembly, two same high-purity germanium detectors, a transmission source, a shielding part of the transmission source and an analysis module, wherein the two same high-purity germanium detectors are provided with collimators. In the invention, the influence of the nonuniformity of materials inside a wastebin is reduced through the constant rotation of the wastebin, layered measurement is carried out on the wastebin undergoing the constant rotation by placing the two same high-purity germanium detectors on different horizontal positions, the radial equivalent radius of each radionuclide layer is obtained through analysis, and the radionuclide activity of the radionuclide layer is accurately computed according to the detection efficient of the radial equivalent radius. Because an assumption of uniform radionuclide distribution is eliminated, the characteristics of an actual wastebin are better accorded with so that the measurement accuracy of the traditional segmenting gamma-scanning technology is greatly enhanced.

Description

technical field [0001] The present invention relates to a device and method in the technical field of nuclear radiation measurement, in particular to a dual-detector segmental gamma scanning measurement device based on equivalent radius correction and a scanning method thereof. Background technique [0002] The rapid development of the nuclear industry and the extensive use of nuclear materials will produce a large amount of low- and medium-level radioactive waste. According to relevant national regulations, the activity of these wastes must be measured before intermediate storage, transportation, and final disposal. Due to the particularity of nuclear waste, it is difficult to measure nuclides. At present, the ideal measurement technology is non-destructive testing technology, among which gamma scanning technology is one of the most widely used detection methods for nuclear power plant barreled waste. The γ-ray scanning measurement technology determines the types and activ...

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Problems solved by technology

[0004] However, this existing technology is based on the assumption that the filling materials and radionuclides in each layer are uniformly distributed, and a scan measurement is performed on each layer. In practice, the waste bin usually does not meet the above assumptions, so it will bring a large error. The error caused by the uneven distribution of radionuclide activity is the most serious

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