| Jin Yihe,YIkebe,TIida.A subnationwide survey of outdoor and indoor222Rn concentrations in china by passive method[J].Chinese Journal of Radiological Medicine and Protection,1996,16(6):363-368 |
| A subnationwide survey of outdoor and indoor222Rn concentrations in china by passive method |
| Received:May 03, 1996 Revised:July 05, 1996 |
| DOI： |
| KeyWords:222Rn concentration passive method geographic distribuion |
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| Abstract:: |
| From Nov.1985 to Mar.1993, cooperated by China and Japan, a survey of outdoor and indoor222 Rn concentrations in 10 cities which were highly populated in China was carried out by means of passive method. The annual mean of outdoor 222Rn concentration in 10 cities was 8.8 Bq. m-3. The highest of 13.5 Bq .m-3 was in Wuhan, the lowest of 3.3Bq.m-3 was in Chongming Island of Shanghai; and there were no significant differences among the different years in the same areas. During the northwest wind seasons, about 50% of outdoor 222Rn concentration in Taiwan was contributed by the airflow from the mainland.Typical apartment houses and offices built of brick and concrete were also surveyed for indoor 22 Rn concentrations. The annual me an of indoor 222 Rn concentration in the 10 cities was 19.SBq. m-3. The highest of 33.9Bq. m-3 was observed in Guiyang, the lowest of 9.OBq.m-3 was observed in Chongming Island of Shanghai. The outdoor and indoor 222Rn concentrations showed a clear seasonal pattern with the minimum in summer and the maxium in winter. And they also showed a clear geographic distribution tendency, they were higher in inlands than in seashores, and higher in the south than in the north. The ratios of indoor to outdoor 222Rn concentrations were from 1.1 to 4.6. The annual effective dose equivalents resulting from outdoor and indoor 222Rn concentrations amounted to about 0.64 mSv. a-1. The highest was in Guiyang, and the lowest was in Nantong, being 1.12 and 0.39 mSv. a-1, respectively. |
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