名古屋市室内空气222Rn、220Rn的测量及EECTn估算

目的 研究室内空气中^222Rn、^220Rn浓度以及室内平衡当量^220Rn浓度EECTn。方法 利用名古屋大学研制的新型被动累积式^222Rn、^220Rn测量杯在日本名古屋市进行了小规模的室内^222Rn、^220Rn的浓度调查，利用Deposition Rate Monitor估算了住宅室内EECTn。结果 在随机抽查的20个住宅室内^222Rn平均浓度为16．94Bqm^-3；其中5个住宅室内^220Rn平均浓度为58．09Bqm^-3，EEGTn平均值为2．75Bqm^-3。结论 本研究结果与日本全国性调查结果^222Rn浓度平均值15．5Bqm^-3相当。^220Rn的浓度在某些泥土墙壁的住房内可能达到比较高的浓度，进行进一步的研究是很有必要的。

Measurement of Indoor 222Rn、220Rn Concentration and EECTn in Nagoya Japan

Objective To study 222Rn 220Rn concentration and EEC_ Tn in indoor air. Method A small-scale survey of indoor radon and thoron concentration was carried out by using the new type of 222Rn 220Rn passive integrating cup monitor. Meanwhile the equilibrium equivalent concentration of thoron (EEC_ Tn) was measured with the Deposition Rate Monitor. Result For the random selective 20 dwellings the average concentration of 222Rn was 16.94 Bqm -3. The averaged concentration of EEC_ Tn and 220Rn was 2.75 Bqm -3 and 58.09 Bqm -3 respectively in 5 dwellings. Conclusion Indoor air 222Rn concentration of this study is consistent with the national survey of Japan in which the result was 15.5 Bqm -3. When the wall of dwelling is built by mud indoor 220Rn concentration maybe very high so further research on indoor 220Rn is necessary.