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A technology of contaminated soil and process, applied in the field of radioactive contaminated soil sorting technology, to achieve the effect of sorting
Inactive Publication Date: 2014-09-17
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology
[0003] In view of the above-mentioned problems existing in the existing radioactive contaminated soil sorting method, the invention provides a kind of radioactive contaminated soil sorting process, and this process comprises the following steps:
Method used
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Embodiment 1
[0021] 4.95kg activity concentration level is 1Bq / g 137 Cs radioactively contaminated soil is the implementation object. According to the Monte Carlo simulation calculation model, the dose rate level at 1cm from the sample surface is 20.5nGy / h, and the dose rate corresponding to the boundary value of the radioactivity concentration is:
[0022] 1) 10 3 Bq / kg, corresponding to 20.5nGy / h
[0023] 2) 10 4 Bq / kg, corresponding to 205nGy / h
[0024] 3) 10 6 Bq / kg, corresponding to 20.5μGy / h
[0025] The relative uncertainty evaluation of the experimental scale for radioactive contaminated soil sorting is 17.3%. At the same time, the dose rate response coefficient is reduced by 6.8% by using the method of taking the average value of two-sided measurement. This part should also be subtracted from the theoretical standard, so there is :
[0026] On-site implementation standard = (1-6.8%) (1-17.3%) × experimental scale standard
[0027] Thus, the final implementation standard for...
Embodiment 2
[0032] 1Bq / g with 12.0kg activity concentration level 137 Cs radioactively contaminated soil is the implementation object. According to the Monte Carlo simulation calculation model, the dose rate level at 1cm from the sample surface is 20.5nGy / h, and the dose rate corresponding to the boundary value of the radioactivity concentration is:
[0033] 1) 10 3 Bq / kg, corresponding to 32.7nGy / h
[0034] 2) 10 4 Bq / kg, corresponding to 327nGy / h
[0035] 3) 10 6 Bq / kg, corresponding to 32.7 μGy / h
[0036] The relative uncertainty evaluation of the experimental scale for radioactive contaminated soil sorting is 17.3%. At the same time, the dose rate response coefficient is reduced by 6.8% by using the method of taking the average value of two-sided measurement. This part should also be subtracted from the theoretical standard, so there is :
[0037] On-site implementation standard = (1-6.8%) (1-17.3%) × experimental scale standard
[0038] Thus, the final implementation standard ...
Embodiment 3
[0043] Adopt radioactive contaminated soil sorting process of the present invention to a batch of polluted dregs (9m3) of this unit 3 ) implemented sorting, and sorted out 67% of the radioactively contaminated soil at the exemption level, and achieved good results.
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Abstract
The invention relates to a treatment method of a solid radioactive pollution material. The invention aims to solve a problem of being incapable of effectively sorting radioactive pollution soil in a sorting method for the radioactive pollution soil in the prior art and provides a sorting technology for the radioactive pollution soil. The technology includes following steps: (1) analyzing source items; (2) determining sorting targets and analyzing sorting values; (3) selecting a sorting method and a model of a sorting device; (4) determining sorting experimental calibrations: establishing a Monte Carlo simulative calculation model of the radioactive pollution soil, carrying out an experimental verification process and determining sorting conditions according to a calculated result and an effective center of a detector; (5) carrying out a sorting process: preparing a sorting site, formulating an on-site implementation standard and designing a sorting container to achieve an on-site quantitative measurement and an on-site quantitative sorting process. An on-site sorting method of the experimental calibrations is employed in the sorting technology for the radioactive pollution soil so that the on-site quantitative measurement of the radioactive pollution soil is achieved and the problem of sorting the radioactive pollution soil is effectively solved.
Description
technical field [0001] The invention relates to a treatment method for solid radioactive contaminated materials, in particular to a sorting process for radioactive contaminated soil. Background technique [0002] The sorting of radioactive contaminated soil refers to the separation of exempt level contaminated soil from radioactive contaminated soil in order to minimize waste. There are two main existing methods: laboratory sampling measurement sorting method and on-site measurement sorting method. pick method. The existing laboratory sampling, measurement and sorting method can realize the quantitative measurement of radionuclides in radioactive contaminated soil, and can realize the effective distinction of radioactive waste, but only for the collected samples, it cannot realize the measurement and analysis of all radioactive contaminated soil ; while the existing on-site measurement and sorting method can realize the measurement and analysis of all radioactively contamin...
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Application Information
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