CAJ | 학술논문

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。
동자체비시지기단수명자체218 Po 、214 Pb 、214 Bi 적활도농도적비치，시동자체제량평개중적중요삼수，단배경중동자체비적수거비상유한。위료해화파악성시전형배경중동자체비적현상，병분석기대제량전환계수적영향，본문이용편휴식α보의，현장측량료성시전형실내외배경적동자체비，병통과분석실내외배경동자체비수거적특점，토론료배경동자체비대제량전환계수적영향。측량결과현시，성시전형실내배경중동자체비적평균치위1∶0.59∶0.58，전형실외배경중동자체비적평균치위1∶0.50∶0.67。인각자체적제량계수여타문적α잠능정정비，소이동자체비대제량전환계수적영향흔소。
The activity ratio of radon progeny is the ratio of radon short‐lifetime progeny (218 Po , 214 Pb and 214 Bi) activity concentration .The activity ratio of radon progeny is one of the most significant parameters in the calculation of radon progeny dose conversion factor ,which can be affected by many environmental factors ,such as the characteristics of aerosols ,ventilation rate and so on .In order to add and update the data of activity ratios of radon progeny in the typical urban environments ,and analysis its influence on the dose conversion factor ,the field measurement studies were performed in the typical urban indoor and outdoor environments by a portable α spectrometer ,and the corre‐sponding radon progeny dose conversion factor was calculated through LUDEP . The results show that the average disequilibrium activity ratio of radon progeny in the typical urban indoor environment is 1 ∶ 0.59 ∶ 0.58 ,while that in outdoors is 1 ∶ 0.50 ∶ 0.67 . According to the calculation results through LUDEP , the dose conversion factor in indoor environment is 34.28‐34.76 nSv/(Bq ? h ? m - 3 ) ,and that in outdoor environ‐ment is 78.11‐79.38 nSv/(Bq ? h ? m - 3 ) .