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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.

大气污染物和人造放射性核素的远距离迁移研究具有重要意义。近年来，计算机的迅速发展使得能够计算庞大而复杂的程序，并发展出可用于预测材料行为的数值模型。然而，考虑到物理和化学特性，现在很难估计所有元素的移动。氡-222是一种稀有气体，半衰期较长，约为3.82天。因此，氘代D1222氘代D1 Rn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气流中沿着大气中氘D1 Rn浓度，在中国烟台、韩国首尔和同和、日本隐岐岛、金泽和名古屋等地设置了静电式氘D1222氚D1 Rn连续监测仪，测得氘D1222氚D1 Rn年平均浓度为8.4±1.9 Bq·m ￣ 2 D1-3 Bq·m ￣ 2 D1，在首尔、五村、横山、金泽和名古屋分别为2.2±0.8 Bq·m氘D1 - 3氘D1、3.5±1.1 Bq·m氘D1 - 3氘D1、5.6±0.7 Bq·m氘D1 - 3氘D1、5.3±1.9 Bq·m氘D1-3氘D1。在每个位置的氘D1222氘D1 Rn浓度表现出明显的季节性模式的春夏最低和秋冬最高。季节变化的原因是监测点夏季主要被海洋性气团覆盖，冬季主要被大陆性气团覆盖。当一个冷锋和一个暖锋经过监测点时，经常观察到浓度的快速增加。大气污染和O_（23）O_（23）O_（23）D_（22）浓度也呈现出同样的变化规律。三维扩散模型可以通过使用在隐岐岛获得的可靠数据进行验证。