Rapid analysis method for multinuclides in radioactive contaminated soil

Abstract

The invention relates to a rapid analysis method for multinuclides in a radioactive contaminated soil. The method comprises the steps that 1) drying, reducing, grinding and sieving are carried out onthe radioactive contaminated soil to acquire a radioactive contaminated soil sample; 2) 1 .0g radioactive contaminated soil is weighed for digestion; 3) after digestion is completed, liquid in a teflon tank is slowly evaporated at low temperature to nearly dry; 4) the sample is dissolved with a 10mL nitric acid solution and transferred to a centrifuge tube; 5) 0.5mL sample acquired in the step 4)is moved to a small stainless steel plate to prepare an alpha measurement source plate; 6) the total alpha and total beta of the sample are measured on the liquid scintillation counter, and the ratioof 241Am+328Pu and 239+240Pu in the total alpha is acquired; 7) the Cherenkov count of the sample is measured prior to the liquid scintillation counter, and after the end of the measurement, 137Cs and60Co in the sample are measured again on the gamma spectrum; and 8) the acidity is adjusted to 5.0 mol / L, and the U content in the sample is measured through a 30% TBP extraction spectrophotometric method. According to the invention, more than 3,000 radioactive contaminated soils in the decommissioning process of nuclear facilities are analyzed and determined.

Description

technical field [0001] The invention belongs to the technical research field of decommissioning of nuclear facilities and treatment of three wastes, and in particular relates to a rapid analysis method for multinuclides in radioactively polluted soil. Background technique [0002] China Nuclear Power 404 Co., Ltd. has successively carried out the cleaning project of the early waste burial site and the cleaning project of some radioactively contaminated areas outside the decommissioned phase of the 801 reactor. It is very important to quickly determine the pollution boundary and clean-up boundary of radioactive waste, which will directly affect the progress and quality of project implementation, avoid unnecessary clean-up work and quickly judge the pollution level of the large amount of contaminated soil generated, so as to timely and correctly For on-site classification and preparation, it is necessary to quickly analyze multi-nuclides in samples. [0003] For ∑α, ∑β, 137 ...

AI Technical Summary

Problems solved by technology

[0003] For ∑α, ∑β, 137 Cs, 60 Co. 90 The rapid analysis and determination of Sr, Pu, Am and other multinuclides has not been reported in China

If the single nuclide determination method in environmental soil samples is used, the same sample needs to be pretreated multiple times, and at the same time 90 The determination of Sr, Am and Pu needs to be separated by radiochemistry, which requires more manpower and material resources, and the sample analysis period is long (wherein 90 The Sr analysis cycle is greater than 13 days, and the gamma nuclide is in accordance with the regulations of GB 11743-89, and the measurement source needs to be placed for 2 to 3 weeks before measurement), and the analysis and detection results of radioactive contaminated soil cannot be provided in time, which directly leads to the on-site radioactive contaminated soil. Without timely classification and preparation, it will affect the follow-up disposal work, and the lag of analysis work will also make it impossible to clear the boundary of the site in time, resulting in a lag in the clean-up progress of the entire polluted area