广州市区室内外空气中氡及其子体浓度调查

本文报道了1984年7月至1985年2月间对广州市区住宅室内外空气中氡(气土)及其子体浓度的初步调查。结果表明:室内外空气中平均~(222)Rn 浓度分别为17.8和13.3Bq·m~(-3),平均~(222)Rn 子体浓度(平衡当量浓度)分别为10.6和8.8Bq·m~(-3);平均~(220)Rn 浓度分别为37.0和14.5Bq·m~(-3),平均~(220)Rn 子体浓度(平衡当量浓度)分别为0.92和0.62Bq·m~(-3)。市区居民吸入氡(气土)及其子体所受的有效剂量当量估计为1.29mSv,与 UN-SCEAR 估计的全球温带地区水平相近,其中(气土)及其子体的贡献为0.35mSv,约为全球正常本底地区的2倍。

INVESTIGATION OF CONCENTRATIONS OF ~(222)Rn,~(220)Rn AND THEIR DAUGHTERS IN AIR IN GUANGZHOU CITY

The paper reports the preliminary investigation of indoorand outdoor concentrations of ~(222)Rn,~(220)Rn and their daughters inuangzhou city from July,1984 to February,1985.The results showedthat the average concentrations of ~(222)Rn indoors and outdoors were 17.8Bq/m~3 and 13.3 Bq/m~3 respectively;the average concentrations of radondaughters(equilibrium equivalent concentration)were 10.6 Bq/m~3 and 8.8Bq/m~3 respectively;The average concentrations of ~(220)Rn were 37.0 Bq/m~3 and 14.5 Bq/m~3 respectively;the average concentation of thoron da-ughters(equilibrium equivalent concentration)were 0.92 Bq/m~3 and0.62 Bq/m~3,respectively.The estimated annual average effective doseequivalent by inhalation of ~(222)Rn,~(220)Rn and their daughters was 1.29mSv and approximated to the level of that at temperate zone,in which,the contribution of ~(220)Rn and its daughters was 0.35 mSv and it wasabout twice as high as that in normal background area.