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氡子体比是指其短寿命子体218 Po、214 Pb、214 Bi的活度浓度的比值,是氡子体剂量评价中的重要参数,但环境中氡子体比的数据非常有限。为了解和把握城市典型环境中氡子体比的现状,并分析其对剂量转换系数的影响,本文利用便携式α谱仪,现场测量了城市典型室内外环境的氡子体比,并通过分析室内外环境氡子体比数据的特点,讨论了环境氡子体比对剂量转换系数的影响。测量结果显示,城市典型室内环境中氡子体比的平均值为1∶0.59∶0.58,典型室外环境中氡子体比的平均值为1∶0.50∶0.67。因各子体的剂量系数与它们的α潜能呈正比,所以氡子体比对剂量转换系数的影响很小。
The radon progeny ratio is the ratio of activity concentrations of its short-lived progeny 218 Po, 214 Pb, 214 Bi and is an important parameter in the assessment of radon progeny dosimetry, but data on radon progeny ratios in the environment are very limited. In order to understand and grasp the status quo of radon body ratio in a typical urban environment and analyze its effect on the dose conversion coefficient, a radionuclide ratio of urban typical indoor and outdoor environment was measured by portable α spectrometer in this paper. The effect of ambient radon progeny ratio on the dose conversion coefficient was discussed in terms of the characteristics of the radon-to-ovary ratio data in the external environment. The measurement results show that the average radon child ratio in urban typical indoor environment is 1: 0.59: 0.58, and the average radon child ratio in typical outdoor environment is 1: 0.50: 0.67. Since the dose coefficients of each progeny are proportional to their alpha potentials, the effect of radon progeny over the dose-to-dose conversion factor is small.