分类： 物理学 >> 核物理学 提交时间： 2025-07-10
摘要： Due to the current situation of the lack of devices and methods for measuring the internal contamination caused by radionuclides in wounds, which may be caused in spent fuel reprocessing and radioisotope production, we developed a new non-contact measurement system for radionuclide-contaminated wounds with better resolution, moderate size, and easy for clinical application by using the imaging and energy spectroscopy measurement technology to measure the amount and distribution of the contamination retained in wound. With that system，a measurement method to estimate the retention depth and activity of nuclides in the injured part was established by making use of the difference of the absorption attenuation coefficient of X/γ rays emitted by retained nuclides in the injured limb with different thicknesses , which realizes the identification of the retained nuclides in wounds, the measurement of the depth and activity of nuclides retained in different types of wounds, as well as the determination of the characteristics of the distribution of radioactive contamination in wounds. The problem of measuring the characteristics of radionuclide-contaminated wounds are solved fundamentally. This study is of great significance in upgrading the level of existing technology for radionuclide-contaminated wounds at home and abroad, improving the monitoring and evaluation system of internal irradiation, and enhancing the occupational health protection level of radiation practitioners.
分类： 物理学 >> 核物理学 提交时间： 2025-04-29
Wang, Mrs. Xiao Rui
Yin, Mrs. Yunyun
Li, Mrs. Aiyun
Wang, Mr. Chuan-gao
Wang, Ms. Ying
Pang, Dr. HongChao
Luo, Dr. Zhiping
摘要： Neptunium-237 (237Np), as a highly toxic radionuclide, poses a significant risk of internal exposure that cannot be underestimated. Once inadvertently inhaled by humans, it can pose an extremely serious threat to health. Therefore, to more effectively recover and accurately measure this radionuclide from various complex samples, this study comprehensively and systematically explored the specific impacts of multiple factors, including fecal sample calcination temperature, the addition of oxidizing and reducing agents, and the separation and purification process using TEVA resin, on the chemical recovery rate of 237Np. The experimental results clearly demonstrate that, under the condition of precisely controlling the fecal sample calcination temperature at 600°C, coupled with the rational addition of oxidizing and reducing agents during the pretreatment process, and employing TEVA resin for meticulous separation and purification (with strict control of column acidity and elution volume throughout the process), the chemical recovery rate of 237Np measured by ICP-MS technology reached an impressive 79.07%. This result convincingly proves that the method adopted in this study can significantly enhance the chemical recovery rate of 237Np. Consequently, this study not only provides solid and reliable technical support for accurately measuring the content of 237Np in fecal samples but also exhibits profound significance and value in safeguarding public health and maintaining environmental safety.
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