Very low-level transuranium nuclide radioactive waste package detection system

Abstract

The invention discloses a very low-level transuranium nuclide radioactive waste package detection system, which relates to the technical fields of nuclear facility decommissioning and radioactive waste treatment so as to realize effective detection on a radioactive waste package with the alpha specific activity level not reaching the transuranium nuclide un-confinement standard and reduce the influences of uneven nuclide distribution on a measurement result. The system comprises a lead shielding chamber, a lead shielding cover, a copper shielding layer, a system internal cylindrical support unit, a detector assembly, a digital gamma spectrum acquisition multichannel analyzer and a control system, wherein the detector assembly comprises a NaI scintillator, a NaI matched support frame and aphotomultiplier tube. Low-level and even un-confinement-level radioactive waste monitoring, evaluation, classification and the like can be realized, the system is not limited to high-sensitive detection on 239Pu-containing wastes and can be promoted and used in the technical fields of classification, detection and disposal of nuclear power wastes, the minimum detectable alpha specific activity ofa plutonium-containing waste can reach below 85Bq / kg, and key support can be provided for safe disposal and minimized management of the radioactive waste.

Description

technical field [0001] The invention relates to the technical field of nuclear facility decommissioning and radioactive waste treatment, in particular to an extremely low-level transuranic nuclide radioactive waste package detection system. More specifically, the present invention provides a radioactive waste package detection system for transuranic nuclides, which can be directly applied to nuclear power plants, fuel element processing plants, nuclear facility decommissioning, military reactor operation, nuclear material processing, and radioactive waste collection and storage Highly sensitive analysis and accurate assessment of α or γ radiation specific activity of extremely low-level radioactive waste, environmental soil samples, plant samples, etc., to meet the detection and judgment standards for radioactive waste with low levels of transuranium nuclides or even clearance levels requirements. Background technique [0002] In the process of nuclear facility operation, d...

AI Technical Summary

Problems solved by technology

However, the existing system has low detection efficiency, poor spatial inhomogeneity, and large volume. The main problems are as follows: ① low detection sensitivity; ② only the specific activity level of gamma emitted in the waste package; It is difficult to reliably obtain the α-specific activity level that meets the technical requirements for radioactive waste classification and detection; ④ The uneven distribution of nuclei contained in waste has a great impact on the uncertainty of the evaluation results; ⑤ It is not conducive to the promotion and application of nuclear activities

Therefore, it will inevitably cause problems such as bulky system, high cost, poor mobility, etc., and it is difficult to be used for on-site detection of nuclear activities and α-specific activity analysis and evaluation of waste.

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