Pretreatment device for analyzing activity of carbon-14 in high-activity tritium water

Abstract

The invention particularly relates to a pretreatment device for analyzing activity of carbon-14 in high-activity tritium water. The pretreatment device comprises an ultraviolet lamp, an oxidation reactor, a carrier gas device and a tritium removal and C-14 absorption device, wherein an oxidant inlet and a sample inlet are respectively formed in the upper part of one side surface of the oxidation reactor; an oxidant and a high-tritium water sample respectively enter the oxidation reactor through the oxidant inlet and the sample inlet; an ultraviolet lamp is arranged in the oxidation reactor, the top of the oxidation reactor is connected with a gas carrying device, a gas outlet is formed in the upper part of the other side surface of the oxidation reactor, and the gas outlet of the oxidation reactor is connected with a tritium removal and C-14 absorption device. According to the pretreatment device for analyzing the activity of carbon-14 in the high-activity tritium water, tritium in a sample is completely removed, C-14 in the sample is collected, and the influence of tritium pulse accumulation on C-14 counting during sample analysis is avoided.

Description

technical field [0001] The invention relates to the technical field of tritium water analysis, in particular to a carbon-14 activity analysis pretreatment device in high-activity tritium water. Background technique [0002] C-14 in heavy water reactor nuclear power plants is mainly produced by the reaction of 17O(n,α)→14C. Due to the differences in chemical properties of various systems in heavy water reactor nuclear power plants, C-14 exists in different forms, such as moderator system C-14 Mainly in the form of inorganic carbon, C-14 in the coolant system mainly exists in the form of volatile gas, methanol, formaldehyde and formic acid and other low-molecular organic substances. [0003] Since heavy water is used as moderator and coolant in heavy water reactor nuclear power plants, the activity of tritium in heavy water is several orders of magnitude higher than that of C-14. When using a liquid scintillation counter to analyze the C-14 activity in high-tritium water, the...

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Problems solved by technology

[0004] Based on this, it is necessary to provide a carbon-14 activity analysis preprocessing device in high-activity tritium water for the problem of the influence of tritium in the sample on the counting of C-14 analysis data during the analysis of C-14 activity in high-activity tritium water. The device completely removes the tritium in the sample, collects the C-14 in the sample, and avoids the impact of tritium pulse accumulation on the C-14 count during sample analysis

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