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| Measurement of 222Rn、220Rn and their decay products in high background radiation area in Yangjiang |
| YUAN Yongling, et al |
| Hunan Provincial Reseach Institute for Labour Health and Occupational Diseases, Changsha 410007 |
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Abstract The investigators have measured concentrations of Rn-222, Rn-220 and their decay products in high background radiation area (HBRA) and the neighboring control area (CA), as well as the equilibrium factor F for Rn-222. The average concentrations of Rn-222 in the air indoors and outdoors in the HBRA are 42.6 and 17.3Bq/respectively, and CA, 13.2 and 11.7 Bq/m3, respectively. The average α-potential energy concentrations for daughters of Rn-222 indoors and outdoors in HBRA are 0.109 and 0.051μJ/m3, CA, 0.045 and 0.041μJ/m3, respectively. The average α-potential energy values for daughters of Rn-220 indoor and outdoor in HBRA are 0.249 and 0.053 μJ/m3, CA, 0.051 and 0.025 μJ/m3, respectively. With regard to equilibrium factor F for Rn-222, we have also measured 52 points of 10 hamlets in HBRA (indoor 31, outdoor 21), 9 points of 2 hamlets in CA (indoor 5, outdoor 4), respectively. These figures are 0.46, 0.53, 0.62 and 0.64, respectively.
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Received: 01 July 1999
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