Sample preparation system of carbon-14 in solid sample

Abstract

The invention provides a sample preparation system of carbon-14 in a solid sample and belongs to the field of a radioactive sample preparation system. The sample preparation system is of an overall integrated cabinet type structure. All parts are arranged in an integrated cabinet. Compressed gas in the sample preparation system is controlled by a gas intake micrometering valve, an automatic valve, a pressure sensor and a mass flow meter and enters a buffering device and a sample tube. Pyrogenic decomposition is carried out on a sample in a decomposition bed in the aerobic atmosphere. A catalyzing bed is used for catalyzing the oxidized gas with heat and the gas is cooled by a cooling device. Tritium adsorption and water processing are carried out through a silica gel adsorption bed. The gas enters absorbers which are connected in series in three levels to be adsorbed through flow control. The re-processed gas is exhausted by a vacuum pump. According to the sample preparation system of the carbon-14 in the solid sample, a computer interface can be directly used for controlling a sample preparation process. In an automatic operation process, an operator can conveniently intervene in the whole operation process after authority of the operator is approved. The sample preparation system of the carbon-14 in the solid sample is economical, practical, capable of saving the energy and protecting the environment, high in practicability, capable of conveniently replacing parts, easy to clean and capable of achieving small scale and automation.

Description

technical field [0001] The invention belongs to the field of radioactive sample preparation systems, in particular to a carbon-14 sample preparation system in solid samples. It is mainly used for the analysis and sample preparation system of radionuclide carbon-14 in graphite and concrete, especially the sample preparation system that can realize automatic control. Background technique [0002] During the operation and decommissioning of nuclear facilities such as nuclear power plants and reactors, a series of solid radioactive wastes containing carbon-14 will be produced. In order to classify and manage these wastes, it is necessary to measure and estimate the radioactivity of carbon-14 . Carbon-14 is a pure β nuclide, which cannot be directly measured by gamma spectrometer or other methods. It must be separated from other nuclides that affect the measurement, and then measured by liquid scintillation. [0003] At present, there is no mature product supply in China for th...

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Problems solved by technology

[0004] In order to overcome the difficulty in replacing core components in the prior art, the bulky size and the high price

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