Study on the method of simultaneous regulation of ²²²Rn/²²⁰Rn progeny activity concentration in ²²⁰Rn chamber

分类： 物理学 >> 核物理学 提交时间： 2025-04-28

Ao, Mr. Tao Xiao, Mr. Ya-Song Xu, Ms. Jing-Yi Pei, Ms. Jing-Yue Liu, Mr. YuFan Feng, Miss Jia-Lu Wang, Miss Kexin Lv, Mrs. Lidan He, Prof. Zhengzhong

摘要： The activity concentration of 222Rn/220Rn progeny is the critical parameter for precise estimation of internal radiation dose to lung tissues. To investigate the behavior of 222Rn/220Rn progeny and to improve the calibration of 222Rn/220Rn progeny activity concentration monitors, a 220Rn chamber that could generate stable and adjustable activity concentrations of both 222Rn and 220Rn progeny was established. This study developed a theoretical model for 222Rn/220Rn progeny activity concentrations in the 220Rn chamber and established a simultaneous regulation method for these concentrations. Based on a tunable carrier aerosol generation system, comprehensive tests were conducted to evaluate the stability and spatial uniformity of aerosol concentrations, 222Rn/220Rn gas concentrations, and progeny activity concentrations within the chamber. The results show that the 220Rn chamber can realize the stable regulation of aerosol particle number concentration in the range of 101 particles/cm3-105 particles/cm3, and realize the activity concentration range of 222Rn progeny (218Po, 214, 214Bi) in the range of 268 Bq/m3-12351 Bq/m3, 18 Bq/m3-5573 Bq/m3, 8 Bq/m3-3868 Bq/m3, and the activity concentrations of 220Rn progeny (212Pb, 212Bi) range from 53 Bq/m3-1217 Bq/m3, 10 Bq/m3-794 Bq/m3. Except for the poor stability of activity concentration of 214Bi and 214Bi at low aerosol concentration, the stability of activity concentration of all other subsomes is better than 10% in other cases. And the results demonstrate that the spatial uniformity of 222Rn/220Rn progeny activity concentrations is better than 10% throughout the chamber, ensuring homogeneous distribution of progeny species. In conclusion, the simultaneous regulation method for 222Rn/220Rn progeny concentrations developed in this study provides a reliable platform for instrument calibration and performance verification.

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