Measurements of radon as tracer of air pollutants in East Asia

东亚空气污染物示踪剂氡的测量

基本信息

批准号：
10044148
负责人：
IIDA Takao
金额：
$ 2.43万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

The study on a long distance transportation of atmospheric pollution and man-made radionuclides has been important. The recent rapid development of computer enables to calculate an enormous and complicated program, and evolve the numerical model available for prediction in a behavior of materials. However, it is now difficult to estimate the movement of all elements considering physical and chemical characteristics. Radon-222 is a noble gas, and has comparatively long half-life of about 3.82d. Therefore, ィイD1222ィエD1Rn is a useful natural radioactive tracer. To measure the atmospheric ィイD1222ィエD1Rn concentrations along the current of air mass from Asian Continent to Japan, Electrostatic continuous ィイD1222ィエD1Rn monitors were set up at Yantai in China, Seoul and Tonhe in Korea, and Oki island, Kanazawa, and Nagoya in Japan.The annual mean ィイD1222ィエD1Rn concentrations were 8.4±1.9 Bq・mィイD1-3ィエD1, 2.2±0.8 Bq・mィイD1-3ィエD1, 3.5±1.1 Bq・mィイD1-3ィエD1, 5.6±0.7 Bq・mィイD1-3ィエD1, 5.3±1.9 Bq・mィイD1-3ィエD1 at Seoul, Gokamura, Yokooyama, Kanazawa, and Nagoya, respectively. The ィイD1222ィエD1Rn concentration at each location showed a clear seasonal pattern of a spring-summer minimum and an autumn-winter maximum. The seasonal variation results from that the monitoring location is covered with mainly a maritime air mass during summer and a continental air mass in winter. The rapid increases of concentrations were often observed when a cold and warm fronts passed over the monitoring location. Then, the atmospheric pollution and OィイD23ィエD2 concentration also showed same variations. The three-dimensional dispersion model could be verified by using a reliable data obtained at Oki island.

关于大气污染和人造放射线的长距离运输的研究很重要。计算机最近的快速开发使计算一个巨大而复杂的程序，并进化可用于预测材料行为的数值模型。但是，现在很难估计考虑物理和化学特征的所有元素的运动。 radon-222是一种贵重的气体，半衰期相对较长约为3.82d。因此，D1222E D1RN是一种有用的天然放射性示踪剂。为了测量从亚洲大陆到日本的空气质量沿着空气质量的大气D122E D1RN的浓度，在中国的Yantai，韩国的首尔和托尼的Yantai建立了静电D1222E D1RN监测器，以及Oki Island，Oki Island，Kanazaazawa，Kanazava和Nagoya。 D1-3E D1，2.2±0.8 Bq ・我的D1-3E D1，3.5±1.1 Bq ・我的D1-3E D1，5.6±0.7 Bq ・My d1-3e D1，5.3±1.9 BQ ・季节的变化是由监测位置覆盖的，夏季主要是海上空气质量，冬季连续空气质量。当寒冷和温暖的阵线经过监测位置时，通常会观察到浓度的迅速增加。然后，大气污染和OII D2浓度也显示出相同的变化。可以使用在Oki岛获得的可靠数据来验证三维色散模型。