Tritiated water electrolytic concentration device and method

Abstract

The invention provides a tritiated water electrolytic concentration device and method. The device comprises an electrolytic cell, a sample bottle, an oxygen exhaust device and a hydrogen exhaust device, wherein the electrolytic cell is used for electrolyzing tritiated water and comprises a water inlet, a hydrogen outlet and an oxygen outlet; the sample bottle comprises a sample inlet and a water outlet, the sample inlet is used for introducing tritiated water samples into the sample bottle, and the water outlet is used for guiding the tritiated water samples out and connected with the water inlet of the electrolytic cell; the oxygen exhaust device is connected to the oxygen outlet of the electrolytic cell and used for exhausting oxygen generated through electrolyzing to the environment; the hydrogen exhaust device is connected with the hydrogen outlet of the electrolytic cell and used for exhausting hydrogen generated through electrolyzing to the environment; and the hydrogen exhaust device comprises a mass flowmeter used for measuring the accumulative mass flow of the hydrogen generated through electrolyzing. According to the technical scheme, the structure design is simple, operation is convenient, the electrolytic efficiency is high, the volume concentration rate is computed accurately, safety is achieved, pollution is avoided, and safe, effective and stable electrolytic concentration of environmental low-level tritiated water is achieved.

Description

technical field [0001] The invention relates to the technical field of environmental radioactivity measurement, in particular to a tritium water electrolysis concentration device and method. Background technique [0002] The activity of tritium in natural environment water is generally lower than the minimum detection limit of existing liquid scintillation counters (about 1Bq / L). GB / T 12375-1990 gives the detection limit of tritium in water as 0.5Bq / L. To measure the radioactivity of tritium in water, it is necessary to first enrich the sample with tritium. [0003] Electrolysis technology is an important means to realize the separation of hydrogen and tritium in water, which can be divided into three categories: alkaline electrolysis, solid polymer membrane electrolysis and proton exchange membrane electrolysis. In terms of electrolytic concentration of low-level tritium water, the International Atomic Energy Commission and some units in my country adopt the alkaline elect...

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Problems solved by technology

In terms of electrolytic concentration of low-level tritium water, the International Atomic Energy Commission and some units in my country adopt the alkaline electrolysis method, which has low efficiency, strong corrosion, limited volume concentration rate and potential safety hazards. There is no complete set of equipment for sale on the market. Self-designed, not easy to popularize; Japan first proposed a solid polymer membrane tritium electrolysis device in 1996, and it has been gradually applied in my country. This method electrolyzes pure water with high electrolysis efficiency, no pollution and volume concentration rate restrictions, but The dead volume of concentrated liquid is large and extremely unstable, which makes the measurement accuracy worse

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