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• W4376850346 abstract "[Background] During the operation of nuclear facility, tritium will be produced when the fission of 235U and the activation of the primary circuit coolant. Besides, 2H, 6Li, 10B and other nuclides can also produce tritium after being bombarded by neutrons. The tritium-containing radioactive gas effluent produced during the operation of nuclear facility and the reprocessing of spent fuel cannot be processed through the conventional three-waste system, and it will be discharged into the environment in the form of HTO and OBT through scavenging and leakage. [Purpose] Tritium has strong mobility and circulation in the biosphere, it can rapidly exchange with hydrogen atoms in all substances and enter the human body through breathing inhalation, skin absorption, and ingestion of contaminated food or water. Once inhaled, tritium is easily absorbed and utilized by the human body, causing a certain period of homogeneous internal exposure hazards and seriously affecting human health. Tritium is an important nuclide in the radioactive gas effluents, and its different chemical forms will have different degrees of impact on professionals and resident around nuclear facility. Therefore, monitoring, managing and controlling the discharge of different chemical forms of tritium is crucial to reducing internal exposure of professionals, reducing radiation level, and ensuring the health and safety of surrounding resident. [Methods] In this paper, the sampling and monitoring experiment of HTO and OBT is designed based on the composition difference of tritium in gas effluents during the operation of nuclear facility. The MARC 7000 tritium sampler is used to collect tritium. And the HTO and OBT are sampled by condensation bubbling method and combustion bubbling method, respectively. Then the tritium samples are obtained by the distillation condensation method. And the concentration of HTO and OBT are measured and analyzed by the liquid scintillation. Finally, dosimetry models are established to estimate the radiation dose of professionals caused by different chemical forms of tritium. [Results] The results show that the emission of tritium in the gas effluents is dominated by HTO, and the breath inhalation contributes more to the intake of tritium. However, in the skin absorption route, the dose conversion factor of OBT is two orders of magnitude higher than that of HTO and OBT in other routes. Therefore, skin absorption is the main way to cause tritium-induced internal exposure of professionals, and the contribution to the dose mainly comes from OBT." @default.
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• W4376850346 date "2023-01-01" @default.
• W4376850346 modified "2023-10-16" @default.
• W4376850346 title "The Study on Monitoring of Different Chemical Forms of Tritium and Tritium-Induced Radiation Dose" @default.
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• W4376850346 doi "https://doi.org/10.1007/978-981-19-8780-9_59" @default.
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