Sampling method for tritiated water in air

Abstract

The invention provides a sampling method for tritiated water in air. A system used by the sampling method comprises a cooling fan, a semiconductor refrigeration sheet, a heat insulation layer, a collection container, a movable cover plate, a hose I, a hose II, a hose III, a power air pump, a power supply, an AC plug, a temperature display, a temperature sensor and a flow display controller. The sampling method comprises the steps of adjusting an intake flow rate equivalent to short-term respiratory volume of a person through the power air pump; pumping tritiated water vapor in air by using a peltier effect of the semiconductor refrigeration sheet; quickly condensing the tritiated water vapor into tritiated water through a coil of the collection container; carrying out volume measurement and liquid scintillation counting on the collected tritiated water; and obtaining the inhalation dose of tritium in air near a respiratory zone of a worker of a tritium-related place according to a calculation formula. The sampling method is suitable for fast sampling of the tritiated water of the air near the worker of the tritium-related place, and is a practical and simple sampling method; and a support can be provided for radiation protection of the worker of the tritium-related place.

Description

technical field [0001] The invention belongs to the technical field of radiation protection and environmental protection, and in particular relates to a sampling method for air tritiated water. Background technique [0002] As one of the important raw materials in the field of nuclear industry and precision weapon production, tritium has the characteristics of beta radioactivity and low toxicity. Among them, the toxicity of tritiated water is more than 10,000 times that of tritium gas. Since tritium is the nuclide with the smallest molecular weight, there is currently no suitable material that can completely protect it. Therefore, the intake of tritiated water by tritium-related workers mainly depends on the tritium content in urine monitored by radiation protection. However, since tritium enters the human body through the respiratory system and is excreted through the urine through a complex metabolic process of the human body, it is impossible to intuitively and quickly ...

AI Technical Summary

Problems solved by technology

However, since tritium enters the human body through the respiratory system and is excreted through the urine through the complex metabolic process of the human body, it is impossible to intuitively and quickly understand the absorbed dose of tritiated water by tritium-related personnel

At present, two "portable tritiated water sampling devices" (publication numbers: CN204422269U and CN103063480A) disclosed in the Chinese patent literature database are designed for fixed-point sampling of tritiated water in the ambient air on site. The volume is too large and the system is relatively large. Complicated, not portable, not suitable for sampling tritiated water that a person might inhale

The commonly used method of absorbing tritiated water from the environment through silica gel is convenient to carry, but the silica gel absorbs water too slowly and the adsorption capacity is low, and it takes a long time (24 hours) to sample. After sampling, the tritiated water adsorbed on the silica gel needs to be distilled , cannot be applied to the nature of short-time work in tritium-related places

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