Energy Dispersive X-ray Fluorescence Analysis System

Abstract

The invention belongs to the determination technology of elements in a radioactive environment, and specifically relates to a graphite crystal pre-diffraction energy dispersive X-ray fluorescence analysis system, which consists of an X-ray tube excitation system, a graphite crystal diffraction optical path, a Si(Li) detector multi-channel system, and a computer. Spectrum processing system, in which the X-ray tube excitation system is composed of X-ray tubes and corresponding circuits and shielding bodies; the graphite crystal diffraction optical path includes optical filters, sample boxes and graphite diffractometers, and graphite diffractometers are cylindrical graphite bodies. Place the shielding body, the energy dispersive X-ray fluorescence analysis system uses internal standard or scattering internal standard to correct the measured intensity; the X-ray tube excitation system uses a low-power X-ray generator of 150-350W; the shielding body in the graphite diffractometer is cylindrical . The system has a short distance from the focal spot to the sample and a compact structure; the shielding body in the graphite diffractometer has a simple structure, lower detection limits, and less sampling volume.

Description

Energy Dispersive X-ray Fluorescence Analysis System technical field The invention belongs to the determination technology of elements in a radioactive environment, and in particular relates to a graphite crystal pre-diffraction energy dispersive X-ray fluorescence analysis system. Background technique The average burnup depth of spent fuel elements in power reactors exceeds 3300MWd / t, and its radioactive intensity is dozens of times that of fuel elements in production reactors. In the advanced two-cycle reprocessing process for processing power reactor spent fuel components, the specific activity of 1AW waste liquid is as high as 10 12 ~10 13 Bq / L, therefore, the analysis of trace actinides and splinter elements in 1AW presents great technical difficulties. However, the content of uranium, neptunium and molybdenum in 1AW is related to the recovery rate of uranium, the direction of neptunium and the decontamination coefficient of lobes, so it must be analyzed. Therefore...

AI Technical Summary

Problems solved by technology

Since Se is added in the primary optical path, it can only correct instrument fluctuations, but cannot correct matrix effects

At the same time, Se is brittle and not easy to fix

In addition, the traditional sample box uses Mylar film as the bottom window of the sample tank, which is difficult to ensure the safety of high-level solution operation

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